Convert.ToUInt32 方法

定義

將指定的值轉換為 32 位元不帶正負號的整數。Converts a specified value to a 32-bit unsigned integer.

多載

ToUInt32(Single)

將指定之單精確度浮點數的值,轉換為相等的 32 位元不帶正負號的整數。Converts the value of the specified single-precision floating-point number to an equivalent 32-bit unsigned integer.

ToUInt32(String, IFormatProvider)

使用指定之特定文化特性格式資訊,將指定之數字的字串表示轉換為相等的 32 位元不帶正負號的整數。Converts the specified string representation of a number to an equivalent 32-bit unsigned integer, using the specified culture-specific formatting information.

ToUInt32(Object, IFormatProvider)

使用指定之特定文化特性格式資訊,將指定之物件的值轉換為 32 位元不帶正負號的整數。Converts the value of the specified object to a 32-bit unsigned integer, using the specified culture-specific formatting information.

ToUInt32(String, Int32)

將指定基底中數字的字串表示,轉換為相等的 32 位元不帶正負號的整數。Converts the string representation of a number in a specified base to an equivalent 32-bit unsigned integer.

ToUInt32(UInt64)

將指定的 64 位元不帶正負號整數的值,轉換為相等的 32 位元不帶正負號整數。Converts the value of the specified 64-bit unsigned integer to an equivalent 32-bit unsigned integer.

ToUInt32(UInt32)

傳回指定的 32 位元不帶正負號整數;不會執行實際的轉換。Returns the specified 32-bit unsigned integer; no actual conversion is performed.

ToUInt32(UInt16)

將指定的 16 位元不帶正負號整數的值,轉換為相等的 32 位元不帶正負號的整數。Converts the value of the specified 16-bit unsigned integer to the equivalent 32-bit unsigned integer.

ToUInt32(String)

將指定之數字的字串表示,轉換為相等的 32 位元不帶正負號的整數。Converts the specified string representation of a number to an equivalent 32-bit unsigned integer.

ToUInt32(SByte)

將指定的 8 位元帶正負號整數的值,轉換為相等的 32 位元不帶正負號整數。Converts the value of the specified 8-bit signed integer to the equivalent 32-bit unsigned integer.

ToUInt32(Char)

將指定的 Unicode 字元值轉換為相等的 32 位元不帶正負號的整數。Converts the value of the specified Unicode character to the equivalent 32-bit unsigned integer.

ToUInt32(Int64)

將指定的 64 位元帶正負號的整數值轉換為相等的 32 位元不帶正負號的整數。Converts the value of the specified 64-bit signed integer to an equivalent 32-bit unsigned integer.

ToUInt32(Int32)

將指定的 32 位元帶正負號的整數值轉換為相等的 32 位元不帶正負號的整數。Converts the value of the specified 32-bit signed integer to an equivalent 32-bit unsigned integer.

ToUInt32(Int16)

將指定的 16 位元帶正負號整數的值,轉換為相等的 32 位元不帶正負號整數。Converts the value of the specified 16-bit signed integer to the equivalent 32-bit unsigned integer.

ToUInt32(Double)

將指定之雙精確度浮點數的值,轉換為相等的 32 位元不帶正負號的整數。Converts the value of the specified double-precision floating-point number to an equivalent 32-bit unsigned integer.

ToUInt32(Decimal)

將指定之十進位數字的值,轉換為相等的 32 位元不帶正負號的整數。Converts the value of the specified decimal number to an equivalent 32-bit unsigned integer.

ToUInt32(DateTime)

呼叫這個方法一律會擲回 InvalidCastExceptionCalling this method always throws InvalidCastException.

ToUInt32(Byte)

將指定的 8 位元不帶正負號整數的值,轉換為相等的 32 位元不帶正負號的整數。Converts the value of the specified 8-bit unsigned integer to the equivalent 32-bit unsigned integer.

ToUInt32(Boolean)

將指定的布林值轉換為相等的 32 位元不帶正負號的整數。Converts the specified Boolean value to the equivalent 32-bit unsigned integer.

ToUInt32(Object)

將指定之物件的值轉換為 32 位元不帶正負號的整數。Converts the value of the specified object to a 32-bit unsigned integer.

ToUInt32(Single)

重要

此 API 不符合 CLS 規範。

將指定之單精確度浮點數的值,轉換為相等的 32 位元不帶正負號的整數。Converts the value of the specified single-precision floating-point number to an equivalent 32-bit unsigned integer.

public:
 static System::UInt32 ToUInt32(float value);
[System.CLSCompliant(false)]
public static uint ToUInt32 (float value);
static member ToUInt32 : single -> uint32
Public Shared Function ToUInt32 (value As Single) As UInteger

參數

value
Single

要轉換的單精確度浮點數。The single-precision floating-point number to convert.

傳回

value,四捨五入為最接近的 32 位元不帶正負號整數。value, rounded to the nearest 32-bit unsigned integer. 如果 value 介於兩個整數正中間時,則傳回偶數;也就是 4.5 會轉換為 4,5.5 會轉換為 6。If value is halfway between two whole numbers, the even number is returned; that is, 4.5 is converted to 4, and 5.5 is converted to 6.

屬性

例外狀況

value 小於零或大於 MaxValuevalue is less than zero or greater than MaxValue.

範例

下列範例會嘗試將 Single 值陣列中的每個元素轉換成不帶正負號的整數。The following example attempts to convert each element in an array of Single values to an unsigned integer.

float[] values= { Single.MinValue, -1.38e10f, -1023.299f, -12.98f,
                  0f, 9.113e-16f, 103.919f, 17834.191f, Single.MaxValue };
uint result;

foreach (float value in values)
{
   try {
      result = Convert.ToUInt32(value);
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                        value.GetType().Name, value, 
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("The {0} value {1} is outside the range of the UInt32 type.",
                        value.GetType().Name, value);
   }   
}                                 
// The example displays the following output:
//    The Single value -3.402823E+38 is outside the range of the UInt32 type.
//    The Single value -1.38E+10 is outside the range of the UInt32 type.
//    The Single value -1023.299 is outside the range of the UInt32 type.
//    The Single value -12.98 is outside the range of the UInt32 type.
//    Converted the Single value 0 to the UInt32 value 0.
//    Converted the Single value 9.113E-16 to the UInt32 value 0.
//    Converted the Single value 103.919 to the UInt32 value 104.
//    Converted the Single value 17834.19 to the UInt32 value 17834.
//    The Single value 3.402823E+38 is outside the range of the UInt32 type.
Dim values() As Single = { Single.MinValue, -1.38e10, -1023.299, -12.98, _
                           0, 9.113e-16, 103.919, 17834.191, Single.MaxValue }
Dim result As UInteger

For Each value As Single In values
   Try
      result = Convert.ToUInt32(value)
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
                        value.GetType().Name, value, result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("The {0} value {1} is outside the range of the UInt32 type.", _
                        value.GetType().Name, value)
   End Try   
Next                                 
' The example displays the following output:
'    The Single value -3.402823E+38 is outside the range of the UInt32 type.
'    The Single value -1.38E+10 is outside the range of the UInt32 type.
'    The Single value -1023.299 is outside the range of the UInt32 type.
'    The Single value -12.98 is outside the range of the UInt32 type.
'    Converted the Single value 0 to the UInt32 value 0.
'    Converted the Single value 9.113E-16 to the UInt32 value 0.
'    Converted the Single value 103.919 to the UInt32 value 104.
'    Converted the Single value 17834.19 to the UInt32 value 17834.
'    The Single value 3.402823E+38 is outside the range of the UInt32 type.

另請參閱

ToUInt32(String, IFormatProvider)

重要

此 API 不符合 CLS 規範。

使用指定之特定文化特性格式資訊,將指定之數字的字串表示轉換為相等的 32 位元不帶正負號的整數。Converts the specified string representation of a number to an equivalent 32-bit unsigned integer, using the specified culture-specific formatting information.

public:
 static System::UInt32 ToUInt32(System::String ^ value, IFormatProvider ^ provider);
[System.CLSCompliant(false)]
public static uint ToUInt32 (string value, IFormatProvider provider);
static member ToUInt32 : string * IFormatProvider -> uint32
Public Shared Function ToUInt32 (value As String, provider As IFormatProvider) As UInteger

參數

value
String

字串,包含要轉換的數字。A string that contains the number to convert.

provider
IFormatProvider

物件,提供特定文化特性格式資訊。An object that supplies culture-specific formatting information.

傳回

value 中之數字相等的 32 位元不帶正負號的整數;如果 valuenull,則為 0 (零)。A 32-bit unsigned integer that is equivalent to the number in value, or 0 (zero) if value is null.

屬性

例外狀況

value 不是由後面接著一連串數字 (0 到 9) 的任意符號所組成。value does not consist of an optional sign followed by a sequence of digits (0 through 9).

value 代表小於 MinValue 或大於 MaxValue 的數字。value represents a number that is less than MinValue or greater than MaxValue.

範例

下列範例會定義自訂 NumberFormatInfo 物件,以將字串 "pos" 辨識為正號,並將字串 "neg" 辨識為負號。The following example defines a custom NumberFormatInfo object that recognizes the string "pos" as the positive sign and the string "neg" as the negative sign. 然後,它會嘗試使用此提供者和不因文化特性而異的 NumberFormatInfo 提供者,將數值字串陣列的每個元素轉換成整數。It then attempts to convert each element of a numeric string array to an integer using both this provider and the NumberFormatInfo provider for the invariant culture.

using System;
using System.Globalization;

public class Class1
{
   public static void Main()
   {
      // Create a NumberFormatInfo object and set several of its
      // properties that apply to numbers.
      NumberFormatInfo provider = new NumberFormatInfo(); 
      provider.PositiveSign = "pos ";
      provider.NegativeSign = "neg ";

      // Define an array of numeric strings.
      string[] values = { "123456789", "+123456789", "pos 123456789", 
                          "123456789.", "123,456,789",  "4294967295", 
                          "4294967296", "-1", "neg 1" };

      foreach (string value in values)
      {
         Console.Write("{0,-20} -->", value);
         try {
            Console.WriteLine("{0,20}", Convert.ToUInt32(value, provider));
         }   
         catch (FormatException) {
            Console.WriteLine("{0,20}", "Bad Format");
         }
         catch (OverflowException) {
            Console.WriteLine("{0,20}", "Numeric Overflow");
         }   
      }
   }
}
// The example displays the following output:
//       123456789            -->           123456789
//       +123456789           -->          Bad Format
//       pos 123456789        -->           123456789
//       123456789.           -->          Bad Format
//       123,456,789          -->          Bad Format
//       4294967295           -->          4294967295
//       4294967296           -->    Numeric Overflow
//       -1                   -->          Bad Format
//       neg 1                -->    Numeric Overflow
Imports System.Globalization

Module Example
   Public Sub Main()
      ' Create a NumberFormatInfo object and set several of its
      ' properties that apply to numbers.
      Dim provider As New NumberFormatInfo() 
      provider.PositiveSign = "pos "
      provider.NegativeSign = "neg "

      ' Define an array of numeric strings.
      Dim values() As String = { "123456789", "+123456789", "pos 123456789", _
                                 "123456789.", "123,456,789",  "4294967295", _
                                 "4294967296", "-1", "neg 1" }

      For Each value As String In values
         Console.Write("{0,-20} -->", value)
         Try
            Console.WriteLine("{0,20}", Convert.ToUInt32(value, provider))
         Catch e As FormatException
            Console.WriteLine("{0,20}", "Bad Format")
         Catch e As OverflowException
            Console.WriteLine("{0,20}", "Numeric Overflow")
         End Try   
      Next
    End Sub 
End Module 
' The example displays the following output:
'       123456789            -->           123456789
'       +123456789           -->          Bad Format
'       pos 123456789        -->           123456789
'       123456789.           -->          Bad Format
'       123,456,789          -->          Bad Format
'       4294967295           -->          4294967295
'       4294967296           -->    Numeric Overflow
'       -1                   -->          Bad Format
'       neg 1                -->    Numeric Overflow

備註

傳回值是在 value上叫用 UInt32.Parse 的結果。The return value is the result of invoking UInt32.Parse on value.

provider 是取得 NumberFormatInfo 物件的 IFormatProvider 實例。provider is an IFormatProvider instance that obtains a NumberFormatInfo object. NumberFormatInfo 物件提供有關 value格式的特定文化特性資訊。The NumberFormatInfo object provides culture-specific information about the format of value. 如果 null``provider,則會使用目前文化特性的 NumberFormatInfoIf provider is null, the NumberFormatInfo for the current culture is used.

如果您不想在轉換失敗時處理例外狀況,您可以改為呼叫 UInt32.TryParse 方法。If you prefer not to handle an exception if the conversion fails, you can call the UInt32.TryParse method instead. 它會傳回 Boolean 值,指出轉換是否成功或失敗。It returns a Boolean value that indicates whether the conversion succeeded or failed.

ToUInt32(Object, IFormatProvider)

重要

此 API 不符合 CLS 規範。

使用指定之特定文化特性格式資訊,將指定之物件的值轉換為 32 位元不帶正負號的整數。Converts the value of the specified object to a 32-bit unsigned integer, using the specified culture-specific formatting information.

public:
 static System::UInt32 ToUInt32(System::Object ^ value, IFormatProvider ^ provider);
[System.CLSCompliant(false)]
public static uint ToUInt32 (object value, IFormatProvider provider);
static member ToUInt32 : obj * IFormatProvider -> uint32
Public Shared Function ToUInt32 (value As Object, provider As IFormatProvider) As UInteger

參數

value
Object

實作 IConvertible 介面的物件。An object that implements the IConvertible interface.

provider
IFormatProvider

物件,提供特定文化特性格式資訊。An object that supplies culture-specific formatting information.

傳回

value 相等的 32 位元不帶正負號的整數;如果 valuenull,則為零。A 32-bit unsigned integer that is equivalent to value, or zero if value is null.

屬性

例外狀況

value 的格式不正確。value is not in an appropriate format.

value 未實作 IConvertible 介面。value does not implement the IConvertible interface.

-或--or- 不支援轉換。The conversion is not supported.

value 代表小於 MinValue 或大於 MaxValue 的數字。value represents a number that is less than MinValue or greater than MaxValue.

範例

下列範例會定義會執行 IConvertible 介面的 HexString 類別,其設計目的是要保存32位帶正負號和32位不帶正負號值的字串表示。The following example defines a HexString class that implements the IConvertible interface and that is designed to hold the string representation of both 32-bit signed and 32-bit unsigned values. 類別包含 Sign 屬性,可指出其十六進位值的正負號。The class includes a Sign property that indicates the sign of its hexadecimal value.

using System;
using System.Globalization;
using System.Text.RegularExpressions;

public enum SignBit { Negative=-1, Zero=0, Positive=1 };

public struct HexString : IConvertible
{
   private SignBit signBit;
   private string hexString;
   
   public SignBit Sign
   {
      set { signBit = value; }
      get { return signBit; } 
   }
   
   public string Value
   {
      set {
         if (value.Trim().Length > 8)
            throw new ArgumentException("The string representation of a 32-bit integer cannot have more than 8 characters.");
         else if (! Regex.IsMatch(value, "([0-9,A-F]){1,8}", RegexOptions.IgnoreCase))
            throw new ArgumentException("The hexadecimal representation of a 32-bit integer contains invalid characters.");             
         else
            hexString = value;
      }
      get { return hexString; }
   }
   
   // IConvertible implementations.
   public TypeCode GetTypeCode()
   {
      return TypeCode.Object;
   }
   
   public bool ToBoolean(IFormatProvider provider)
   {
      return signBit != SignBit.Zero;
   } 
   
   public byte ToByte(IFormatProvider provider)
   {
      if (signBit == SignBit.Negative)
         throw new OverflowException(String.Format("{0} is out of range of the Byte type.", Convert.ToInt32(hexString, 16))); 
      else
         try {
            return Byte.Parse(hexString, NumberStyles.HexNumber);
         }
         catch (OverflowException e) {
            throw new OverflowException(String.Format("{0} is out of range of the Byte type.", Convert.ToUInt32(hexString, 16)), e);
         }   
   }
   
   public char ToChar(IFormatProvider provider)
   {
      if (signBit == SignBit.Negative) 
         throw new OverflowException(String.Format("{0} is out of range of the Char type.", Convert.ToInt32(hexString, 16)));
      
      try {
         ushort codePoint = UInt16.Parse(this.hexString, NumberStyles.HexNumber);
         return Convert.ToChar(codePoint);
      }
      catch (OverflowException e) {
         throw new OverflowException(String.Format("{0} is out of range of the Char type.", Convert.ToUInt32(hexString, 16)), e);
      }      
   } 
   
   public DateTime ToDateTime(IFormatProvider provider)
   {
      throw new InvalidCastException("Hexadecimal to DateTime conversion is not supported.");
   }
   
   public decimal ToDecimal(IFormatProvider provider)
   {
      if (signBit == SignBit.Negative)
      {
         int hexValue = Int32.Parse(hexString, NumberStyles.HexNumber);
         return Convert.ToDecimal(hexValue);
      }
      else
      {
         uint hexValue = UInt32.Parse(hexString, NumberStyles.HexNumber);
         return Convert.ToDecimal(hexValue);
      }
   }
   
   public double ToDouble(IFormatProvider provider)
   {
      if (signBit == SignBit.Negative)
         return Convert.ToDouble(Int32.Parse(hexString, NumberStyles.HexNumber));
      else
         return Convert.ToDouble(UInt32.Parse(hexString, NumberStyles.HexNumber));
   }   
   
   public short ToInt16(IFormatProvider provider)
   {
      if (signBit == SignBit.Negative)
         try {
            return Convert.ToInt16(Int32.Parse(hexString, NumberStyles.HexNumber));
         }
         catch (OverflowException e) {
            throw new OverflowException(String.Format("{0} is out of range of the Int16 type.", Convert.ToInt32(hexString, 16)), e);
         }
      else
         try {
            return Convert.ToInt16(UInt32.Parse(hexString, NumberStyles.HexNumber));
         }
         catch (OverflowException e) {
            throw new OverflowException(String.Format("{0} is out of range of the Int16 type.", Convert.ToUInt32(hexString, 16)), e);
         }
   }
   
   public int ToInt32(IFormatProvider provider)
   {
      if (signBit == SignBit.Negative)
         return Int32.Parse(hexString, NumberStyles.HexNumber);
      else
         try {
            return Convert.ToInt32(UInt32.Parse(hexString, NumberStyles.HexNumber));
         }
         catch (OverflowException e) {
            throw new OverflowException(String.Format("{0} is out of range of the Int32 type.", Convert.ToUInt32(hexString, 16)), e);
         }   
   }
   
   public long ToInt64(IFormatProvider provider) 
   {
      if (signBit == SignBit.Negative)
         return Convert.ToInt64(Int32.Parse(hexString, NumberStyles.HexNumber));
      else
         return Int64.Parse(hexString, NumberStyles.HexNumber);
   }
   
   public sbyte ToSByte(IFormatProvider provider) 
   {
      if (signBit == SignBit.Negative)
         try {
            return Convert.ToSByte(Int32.Parse(hexString, NumberStyles.HexNumber));
         }
         catch (OverflowException e) {
            throw new OverflowException(String.Format("{0} is outside the range of the SByte type.", 
                                                      Int32.Parse(hexString, NumberStyles.HexNumber), e));
         }
      else
         try {
            return Convert.ToSByte(UInt32.Parse(hexString, NumberStyles.HexNumber));
         }
         catch (OverflowException e) {
            throw new OverflowException(String.Format("{0} is outside the range of the SByte type.", 
                                                    UInt32.Parse(hexString, NumberStyles.HexNumber)), e);
         }   
   }

   public float ToSingle(IFormatProvider provider)
   {
      if (signBit == SignBit.Negative)
         return Convert.ToSingle(Int32.Parse(hexString, NumberStyles.HexNumber));
      else
         return Convert.ToSingle(UInt32.Parse(hexString, NumberStyles.HexNumber));
   }

   public string ToString(IFormatProvider provider)
   {
      return "0x" + this.hexString;
   }
   
   public object ToType(Type conversionType, IFormatProvider provider)
   {
      switch (Type.GetTypeCode(conversionType))
      {
         case TypeCode.Boolean: 
            return this.ToBoolean(null);
         case TypeCode.Byte:
            return this.ToByte(null);
         case TypeCode.Char:
            return this.ToChar(null);
         case TypeCode.DateTime:
            return this.ToDateTime(null);
         case TypeCode.Decimal:
            return this.ToDecimal(null);
         case TypeCode.Double:
            return this.ToDouble(null);
         case TypeCode.Int16:
            return this.ToInt16(null);
         case TypeCode.Int32:
            return this.ToInt32(null);
         case TypeCode.Int64:
            return this.ToInt64(null);
         case TypeCode.Object:
            if (typeof(HexString).Equals(conversionType))
               return this;
            else
               throw new InvalidCastException(String.Format("Conversion to a {0} is not supported.", conversionType.Name));
         case TypeCode.SByte:
            return this.ToSByte(null);
         case TypeCode.Single:
            return this.ToSingle(null);
         case TypeCode.String:
            return this.ToString(null);
         case TypeCode.UInt16:
            return this.ToUInt16(null);
         case TypeCode.UInt32:
            return this.ToUInt32(null);
         case TypeCode.UInt64:
            return this.ToUInt64(null);   
         default:
            throw new InvalidCastException(String.Format("Conversion to {0} is not supported.", conversionType.Name));   
      }
   }
   
   public ushort ToUInt16(IFormatProvider provider) 
   {
      if (signBit == SignBit.Negative)
         throw new OverflowException(String.Format("{0} is outside the range of the UInt16 type.",
                                                   Int32.Parse(hexString, NumberStyles.HexNumber)));
      else
         try {
            return Convert.ToUInt16(UInt32.Parse(hexString, NumberStyles.HexNumber));
         }   
         catch (OverflowException e) {
            throw new OverflowException(String.Format("{0} is out of range of the UInt16 type.", Convert.ToUInt32(hexString, 16)), e);
         }            
   }

   public uint ToUInt32(IFormatProvider provider)
   {
      if (signBit == SignBit.Negative)
         throw new OverflowException(String.Format("{0} is outside the range of the UInt32 type.", 
                                                   Int32.Parse(hexString, NumberStyles.HexNumber)));
      else
         return Convert.ToUInt32(hexString, 16);
   }
   
   public ulong ToUInt64(IFormatProvider provider) 
   {
      if (signBit == SignBit.Negative)
         throw new OverflowException(String.Format("{0} is outside the range of the UInt64 type.", 
                                                   Int32.Parse(hexString, NumberStyles.HexNumber)));
      else
         return Convert.ToUInt64(hexString, 16);
   }
}
Imports System.Globalization
Imports System.Text.RegularExpressions

Public Enum SignBit As Integer
   Positive = 1
   Zero = 0
   Negative = -1
End Enum

Public Structure HexString : Implements IConvertible
   Private signBit As SignBit
   Private hexString As String
   
   Public Property Sign As SignBit
      Set
         signBit = value
      End Set
      Get
         Return signBit
      End Get
   End Property
   
   Public Property Value As String
      Set
         If value.Trim().Length > 8 Then
            Throw New ArgumentException("The string representation of a 32-bit integer cannot have more than 8 characters.")
         Else If Not Regex.IsMatch(value, "([0-9,A-F]){1,8}", RegexOptions.IgnoreCase) Then
            Throw New ArgumentException("The hexadecimal representation of a 32-bit integer contains invalid characters.")             
         Else
            hexString = value
         End If   
      End Set
      Get
         Return hexString
      End Get
   End Property
   
   ' IConvertible implementations.
   Public Function GetTypeCode() As TypeCode _
                   Implements IConvertible.GetTypeCode
      Return TypeCode.Object
   End Function
   
   Public Function ToBoolean(provider As IFormatProvider) As Boolean _
                   Implements IConvertible.ToBoolean
      Return signBit <> SignBit.Zero
   End Function 
   
   Public Function ToByte(provider As IFormatProvider) As Byte _
                   Implements IConvertible.ToByte
      If signBit = SignBit.Negative Then
         Throw New OverflowException(String.Format("{0} is out of range of the Byte type.", Convert.ToInt32(hexString, 16))) 
      Else
         Try
            Return Byte.Parse(hexString, NumberStyles.HexNumber)
         Catch e As OverflowException
            Throw New OverflowException(String.Format("{0} is out of range of the Byte type.", Convert.ToUInt32(hexString, 16)), e)
         End Try   
      End If       
   End Function
   
   Public Function ToChar(provider As IFormatProvider) As Char _
                   Implements IConvertible.ToChar
      If signBit = SignBit.Negative Then 
         Throw New OverflowException(String.Format("{0} is out of range of the Char type.", Convert.ToInt32(hexString, 16)))
      End If
      
      Try
         Dim codePoint As UInt16 = UInt16.Parse(Me.hexString, NumberStyles.HexNumber)
         Return Convert.ToChar(codePoint)
      Catch e As OverflowException
         Throw New OverflowException(String.Format("{0} is out of range of the Char type.", Convert.ToUInt32(hexString, 16)))
      End Try      
   End Function 
   
   Public Function ToDateTime(provider As IFormatProvider) As Date _
                   Implements IConvertible.ToDateTime
      Throw New InvalidCastException("Hexadecimal to DateTime conversion is not supported.")
   End Function
   
   Public Function ToDecimal(provider As IFormatProvider) As Decimal _
                   Implements IConvertible.ToDecimal
      If signBit = SignBit.Negative Then
         Dim hexValue As Integer = Int32.Parse(hexString, NumberStyles.HexNumber)
         Return Convert.ToDecimal(hexValue)
      Else
         Dim hexValue As UInteger = UInt32.Parse(hexString, NumberStyles.HexNumber)
         Return Convert.ToDecimal(hexValue)
      End If
   End Function
   
   Public Function ToDouble(provider As IFormatProvider) As Double _
                   Implements IConvertible.ToDouble
      If signBit = SignBit.Negative Then
         Return Convert.ToDouble(Int32.Parse(hexString, NumberStyles.HexNumber))
      Else
         Return Convert.ToDouble(UInt32.Parse(hexString, NumberStyles.HexNumber))
      End If   
   End Function   
   
   Public Function ToInt16(provider As IFormatProvider) As Int16 _
                   Implements IConvertible.ToInt16
      If signBit = SignBit.Negative Then
         Try
            Return Convert.ToInt16(Int32.Parse(hexString, NumberStyles.HexNumber))
         Catch e As OverflowException
            Throw New OverflowException(String.Format("{0} is out of range of the Int16 type.", Convert.ToInt32(hexString, 16)), e)
         End Try
      Else
         Try
            Return Convert.ToInt16(UInt32.Parse(hexString, NumberStyles.HexNumber))
         Catch e As OverflowException
            Throw New OverflowException(String.Format("{0} is out of range of the Int16 type.", Convert.ToUInt32(hexString, 16)), e)
         End Try
      End If   
   End Function
   
   Public Function ToInt32(provider As IFormatProvider) As Int32 _
                   Implements IConvertible.ToInt32
      If signBit = SignBit.Negative Then
         Return Int32.Parse(hexString, NumberStyles.HexNumber)
      Else
         Try
            Return Convert.ToInt32(UInt32.Parse(hexString, NumberStyles.HexNumber))
         Catch e As OverflowException
            Throw New OverflowException(String.Format("{0} is out of range of the Int32 type.", Convert.ToUInt32(hexString, 16)), e)
         End Try   
      End If   
   End Function
   
   Public Function ToInt64(provider As IFormatProvider) As Int64 _
                   Implements IConvertible.ToInt64
      If signBit = SignBit.Negative Then
         Return Convert.ToInt64(Int32.Parse(hexString, NumberStyles.HexNumber))
      Else
         Return Int64.Parse(hexString, NumberStyles.HexNumber)
      End If   
   End Function
   
   Public Function ToSByte(provider As IFormatProvider) As SByte _
                   Implements IConvertible.ToSByte
      If signBit = SignBit.Negative Then
         Try
            Return Convert.ToSByte(Int32.Parse(hexString, NumberStyles.HexNumber))
         Catch e As OverflowException
            Throw New OverflowException(String.Format("{0} is outside the range of the SByte type.", _
                                                      Int32.Parse(hexString, NumberStyles.HexNumber), e))
         End Try
      Else
         Try
            Return Convert.ToSByte(UInt32.Parse(hexString, NumberStyles.HexNumber))
         Catch e As OverflowException
            Throw New OverflowException(String.Format("{0} is outside the range of the SByte type.", _
                                                    UInt32.Parse(hexString, NumberStyles.HexNumber)), e)
         End Try   
      End If
   End Function

   Public Function ToSingle(provider As IFormatProvider) As Single _
                   Implements IConvertible.ToSingle
      If signBit = SignBit.Negative Then
         Return Convert.ToSingle(Int32.Parse(hexString, NumberStyles.HexNumber))
      Else
         Return Convert.ToSingle(UInt32.Parse(hexString, NumberStyles.HexNumber))
      End If   
   End Function

   Public Overloads Function ToString(provider As IFormatProvider) As String _
                   Implements IConvertible.ToString
      Return "0x" & Me.hexString
   End Function
   
   Public Function ToType(conversionType As Type, provider As IFormatProvider) As Object _
                   Implements IConvertible.ToType
      Select Case Type.GetTypeCode(conversionType)
         Case TypeCode.Boolean 
            Return Me.ToBoolean(Nothing)
         Case TypeCode.Byte
            Return Me.ToByte(Nothing)
         Case TypeCode.Char
            Return Me.ToChar(Nothing)
         Case TypeCode.DateTime
            Return Me.ToDateTime(Nothing)
         Case TypeCode.Decimal
            Return Me.ToDecimal(Nothing)
         Case TypeCode.Double
            Return Me.ToDouble(Nothing)
         Case TypeCode.Int16
            Return Me.ToInt16(Nothing)
         Case TypeCode.Int32
            Return Me.ToInt32(Nothing)
         Case TypeCode.Int64
            Return Me.ToInt64(Nothing)
         Case TypeCode.Object
            If GetType(HexString).Equals(conversionType) Then
               Return Me
            Else
               Throw New InvalidCastException(String.Format("Conversion to a {0} is not supported.", conversionType.Name))
            End If 
         Case TypeCode.SByte
            Return Me.ToSByte(Nothing)
         Case TypeCode.Single
            Return Me.ToSingle(Nothing)
         Case TypeCode.String
            Return Me.ToString(Nothing)
         Case TypeCode.UInt16
            Return Me.ToUInt16(Nothing)
         Case TypeCode.UInt32
            Return Me.ToUInt32(Nothing)
         Case TypeCode.UInt64
            Return Me.ToUInt64(Nothing)   
         Case Else
            Throw New InvalidCastException(String.Format("Conversion to {0} is not supported.", conversionType.Name))   
      End Select
   End Function
   
   Public Function ToUInt16(provider As IFormatProvider) As UInt16 _
                   Implements IConvertible.ToUInt16
      If signBit = SignBit.Negative Then
         Throw New OverflowException(String.Format("{0} is outside the range of the UInt16 type.", _
                                                   Int32.Parse(hexString, NumberStyles.HexNumber)))
      Else
         Try
            Return Convert.ToUInt16(UInt32.Parse(hexString, NumberStyles.HexNumber))
         Catch e As OverflowException
            Throw New OverflowException(String.Format("{0} is out of range of the UInt16 type.", Convert.ToUInt32(hexString, 16)), e)
         End Try            
      End If   
   End Function

   Public Function ToUInt32(provider As IFormatProvider) As UInt32 _
                   Implements IConvertible.ToUInt32
      If signBit = SignBit.Negative Then
         Throw New OverflowException(String.Format("{0} is outside the range of the UInt32 type.", _
                                                   Int32.Parse(hexString, NumberStyles.HexNumber)))
      Else
         Return Convert.ToUInt32(hexString, 16)
      End If   
   End Function
   
   Public Function ToUInt64(provider As IFormatProvider) As UInt64 _
                   Implements IConvertible.ToUInt64
      If signBit = SignBit.Negative Then
         Throw New OverflowException(String.Format("{0} is outside the range of the UInt64 type.", _
                                                   Int32.Parse(hexString, NumberStyles.HexNumber)))
      Else
         Return Convert.ToUInt64(hexString, 16)
      End If   
   End Function
   
End Structure

下列範例顯示呼叫 ToUInt32(Object, IFormatProvider) 方法,將 HexString 物件當做參數傳遞,然後呼叫 HexString 類別的 IConvertible.ToUInt32 執行。The following example shows that a call to the ToUInt32(Object, IFormatProvider) method that passes a HexString object as a parameter, in turn, calls the IConvertible.ToUInt32 implementation of the HexString class.

public class Example
{
   public static void Main()
   {
      uint positiveValue = 320000000;
      int negativeValue = -1;
      
      HexString positiveString = new HexString();
      positiveString.Sign = (SignBit) Math.Sign(positiveValue);
      positiveString.Value = positiveValue.ToString("X4");
      
      HexString negativeString = new HexString();
      negativeString.Sign = (SignBit) Math.Sign(negativeValue);
      negativeString.Value = negativeValue.ToString("X4");
      
      try {
         Console.WriteLine("0x{0} converts to {1}.", positiveString.Value, Convert.ToUInt32(positiveString));
      }
      catch (OverflowException) {
         Console.WriteLine("{0} is outside the range of the UInt32 type.", 
                           Int32.Parse(positiveString.Value, NumberStyles.HexNumber));
      }

      try {
         Console.WriteLine("0x{0} converts to {1}.", negativeString.Value, Convert.ToUInt32(negativeString));
      }
      catch (OverflowException) {
         Console.WriteLine("{0} is outside the range of the UInt32 type.",
                           Int32.Parse(negativeString.Value, NumberStyles.HexNumber));
      }   
   }
}
// The example dosplays the following output:
//       0x1312D000 converts to 320000000.
//       -1 is outside the range of the UInt32 type.
Module Example
   Public Sub Main()
      Dim positiveValue As UInt32 = 320000000
      Dim negativeValue As Int32 = -1
      
      
      Dim positiveString As New HexString()
      positiveString.Sign = CType(Math.Sign(positiveValue), SignBit)
      positiveString.Value = positiveValue.ToString("X4")
      
      Dim negativeString As New HexString()
      negativeString.Sign = CType(Math.Sign(negativeValue), SignBit)
      negativeString.Value = negativeValue.ToString("X4")
      
      Try
         Console.WriteLine("0x{0} converts to {1}.", positiveString.Value, Convert.ToUInt32(positiveString))
      Catch e As OverflowException
         Console.WriteLine("{0} is outside the range of the UInt32 type.", _
                           Int32.Parse(positiveString.Value, NumberStyles.HexNumber))
      End Try

      Try
         Console.WriteLine("0x{0} converts to {1}.", negativeString.Value, Convert.ToUInt32(negativeString))
      Catch e As OverflowException
         Console.WriteLine("{0} is outside the range of the UInt32 type.", _
                           Int32.Parse(negativeString.Value, NumberStyles.HexNumber))
      End Try   
   End Sub
End Module
' The example dosplays the following output:
'       0x1312D000 converts to 320000000.
'       -1 is outside the range of the UInt32 type.

備註

傳回值是叫用 value基礎類型之 IConvertible.ToUInt32 方法的結果。The return value is the result of invoking the IConvertible.ToUInt32 method of the underlying type of value.

provider 可讓使用者指定有關 value內容的特定文化特性轉換資訊。provider enables the user to specify culture-specific conversion information about the contents of value. 例如,如果 value 是代表數位的 Stringprovider 可以提供有關用來表示該數位之標記法的特定文化特性資訊。For example, if value is a String that represents a number, provider could supply culture-specific information about the notation used to represent that number.

基底類型會忽略 provider;不過,如果 value 是用來執行 IConvertible 介面的使用者定義型別,則可以使用參數。The base types ignore provider; however, the parameter may be used if value is a user-defined type that implements the IConvertible interface.

ToUInt32(String, Int32)

重要

此 API 不符合 CLS 規範。

將指定基底中數字的字串表示,轉換為相等的 32 位元不帶正負號的整數。Converts the string representation of a number in a specified base to an equivalent 32-bit unsigned integer.

public:
 static System::UInt32 ToUInt32(System::String ^ value, int fromBase);
[System.CLSCompliant(false)]
public static uint ToUInt32 (string value, int fromBase);
static member ToUInt32 : string * int -> uint32
Public Shared Function ToUInt32 (value As String, fromBase As Integer) As UInteger

參數

value
String

字串,包含要轉換的數字。A string that contains the number to convert.

fromBase
Int32

value 中數字的基底,必須是 2、8、10 或 16。The base of the number in value, which must be 2, 8, 10, or 16.

傳回

value 中之數字相等的 32 位元不帶正負號的整數;如果 valuenull,則為 0 (零)。A 32-bit unsigned integer that is equivalent to the number in value, or 0 (zero) if value is null.

屬性

例外狀況

fromBase 不是 2、8、10 或 16。fromBase is not 2, 8, 10, or 16.

-或--or- 代表非 10 進位不帶正負號數字的 value,有前置負號。value, which represents a non-base 10 unsigned number, is prefixed with a negative sign.

valueEmptyvalue is Empty.

value 所包含的字元在 fromBase 指定的基底中不是有效數字。value contains a character that is not a valid digit in the base specified by fromBase. 如果 value 中的第一個字元無效,例外狀況訊息會指出沒有數字可進行轉換;否則訊息會指出 value 包含無效的尾端字元。The exception message indicates that there are no digits to convert if the first character in value is invalid; otherwise, the message indicates that value contains invalid trailing characters.

代表非基底 10 不帶正負號數字的value,前面會加上負號。value, which represents a non-base 10 unsigned number, is prefixed with a negative sign.

-或--or- value 代表小於 MinValue 或大於 MaxValue 的數字。value represents a number that is less than MinValue or greater than MaxValue.

範例

下列範例會嘗試將數值字串陣列中的每個元素轉譯為十六進位值,並將它轉換成不帶正負號的整數。The following example attempts to interpret each element in an array of numeric strings as a hexadecimal value and to convert it to an unsigned integer.

public class Example
{
   public static void Main()
   {
      string[] hexStrings = { "80000000", "0FFFFFFF", "F0000000", "00A3000", "D", 
                              "-13", "9AC61", "GAD", "FFFFFFFFFF" };
      
      foreach (string hexString in hexStrings)
      {
         Console.Write("{0,-12}  -->  ", hexString);
         try {
            uint number = Convert.ToUInt32(hexString, 16);
            Console.WriteLine("{0,18:N0}", number);
         }
         catch (FormatException) {
            Console.WriteLine("{0,18}", "Bad Format");
         }   
         catch (OverflowException)
         {
            Console.WriteLine("{0,18}", "Numeric Overflow");
         }   
         catch (ArgumentException) {
            Console.WriteLine("{0,18}", "Invalid in Base 16");
         }
      }                                            
   }
}
// The example displays the following output:
//       80000000      -->       2,147,483,648
//       0FFFFFFF      -->         268,435,455
//       F0000000      -->       4,026,531,840
//       00A3000       -->             667,648
//       D             -->                  13
//       -13           -->  Invalid in Base 16
//       9AC61         -->             633,953
//       GAD           -->          Bad Format
//       FFFFFFFFFF    -->    Numeric Overflow
Module Example
   Public Sub Main()
      Dim hexStrings() As String = { "80000000", "0FFFFFFF", "F0000000", "00A3000", "D", _
                                     "-13", "9AC61", "GAD", "FFFFFFFFFF" }
      For Each hexString As String In hexStrings
         Console.Write("{0,-12}  -->  ", hexString)
         Try
            Dim number As UInteger = Convert.ToUInt32(hexString, 16)
            Console.WriteLine("{0,18:N0}", number)
         Catch e As FormatException
            Console.WriteLine("{0,18}", "Bad Format")
         Catch e As OverflowException
            Console.WriteLine("{0,18}", "Numeric Overflow")
         Catch e As ArgumentException
            Console.WriteLine("{0,18}", "Invalid in Base 16")
         End Try
      Next                                            
   End Sub
End Module
'    ' The example displays the following output:
'    80000000      -->       2,147,483,648
'    0FFFFFFF      -->         268,435,455
'    F0000000      -->       4,026,531,840
'    00A3000       -->             667,648
'    D             -->                  13
'    -13           -->  Invalid in Base 16
'    9AC61         -->             633,953
'    GAD           -->          Bad Format
'    FFFFFFFFFF    -->    Numeric Overflow

備註

如果 fromBase 為16,您可以在 value 參數所指定的數位前面加上 "0x" 或 "0X"。If fromBase is 16, you can prefix the number specified by the value parameter with "0x" or "0X".

因為 UInt32 資料類型只支援不帶正負號的值,所以 ToUInt32(String, Int32) 方法會假設 value 是使用不帶正負號的二進位標記法來表示。Because the UInt32 data type supports unsigned values only, the ToUInt32(String, Int32) method assumes that value is expressed using unsigned binary representation. 換句話說,所有32位都是用來代表數值,而且不存在正負號位。In other words, all 32 bits are used to represent the numeric value, and a sign bit is absent. 因此,您可以撰寫程式碼,其中的帶正負號整數值超出 UInt32 資料類型的範圍會轉換成 UInt32 值,而不會擲回例外狀況的方法。As a result, it is possible to write code in which a signed integer value that is out of the range of the UInt32 data type is converted to a UInt32 value without the method throwing an exception. 下列範例會將 MinValue 轉換為其十六進位字串表示,然後呼叫 ToUInt32(String, Int32) 方法。The following example converts MinValue to its hexadecimal string representation, and then calls the ToUInt32(String, Int32) method. 方法不會擲回例外狀況,而是會顯示訊息「0x80000000 會轉換成2147483648」。Instead of throwing an exception, the method displays the message, "0x80000000 converts to 2147483648."

// Create a hexadecimal value out of range of the UInt32 type.
string value = Convert.ToString(Int32.MinValue, 16);
// Convert it back to a number.
try
{
   UInt32 number = Convert.ToUInt32(value, 16);
   Console.WriteLine("0x{0} converts to {1}.", value, number);
}   
catch (OverflowException)
{
   Console.WriteLine("Unable to convert '0x{0}' to an unsigned integer.", 
                     value);
}   
' Create a hexadecimal value out of range of the UInt32 type.
Dim value As String = Convert.ToString(Integer.MinValue, 16)
' Convert it back to a number.
Try
   Dim number As UInt32 = Convert.ToUInt32(value, 16)
   Console.WriteLine("0x{0} converts to {1}.", value, number)
Catch e As OverflowException
   Console.WriteLine("Unable to convert '0x{0}' to an unsigned integer.", _
                     value)
End Try   

執行二進位作業或數值轉換時,開發人員必須負責確認方法或運算子使用適當的數值標記法來解讀特定的值。When performing binary operations or numeric conversions, it is always the responsibility of the developer to verify that a method or operator is using the appropriate numeric representation to interpret a particular value. 下列範例說明一項技術,可確保方法在將十六進位字串轉換為 UInt32 值時,不會不當使用二進位標記法來解讀使用兩個補數表示的值。The following example illustrates one technique for ensuring that the method does not inappropriately use binary representation to interpret a value that uses two's complement representation when converting a hexadecimal string to a UInt32 value. 此範例會在將該值轉換成其字串表示時,判斷某個值是否代表帶正負號或不帶正負號的整數。The example determines whether a value represents a signed or an unsigned integer while it is converting that value to its string representation. 當範例將值轉換為 UInt32 值時,它會檢查原始值是否為帶正負號的整數。When the example converts the value to a UInt32 value, it checks whether the original value was a signed integer. 如果是,而且如果設定了高序位位(表示原始值是負數),方法就會擲回例外狀況(exception)。If so, and if its high-order bit is set (which indicates that the original value was negative), the method throws an exception.

// Create a negative hexadecimal value out of range of the UInt32 type.
int sourceNumber = Int32.MinValue;
bool isSigned = Math.Sign((int)sourceNumber.GetType().GetField("MinValue").GetValue(null)) == -1;
string value = Convert.ToString(sourceNumber, 16);
UInt32 targetNumber;
try
{
   targetNumber = Convert.ToUInt32(value, 16);
   if (isSigned && ((targetNumber & 0x80000000) != 0))
      throw new OverflowException();
   else 
      Console.WriteLine("0x{0} converts to {1}.", value, targetNumber);
}
catch (OverflowException)
{
   Console.WriteLine("Unable to convert '0x{0}' to an unsigned integer.", 
                     value);
} 
// Displays the following to the console:
//    Unable to convert '0x80000000' to an unsigned integer.     
' Create a negative hexadecimal value out of range of the UInt32 type.
Dim sourceNumber As Integer = Integer.MinValue
Dim isSigned As Boolean = Math.Sign(sourceNumber.MinValue) = -1
Dim value As String = Convert.ToString(sourceNumber, 16)
Dim targetNumber As UInt32
Try
   targetNumber = Convert.ToUInt32(value, 16)
   If isSigned And ((targetNumber And &H80000000) <> 0) Then
      Throw New OverflowException()
   Else 
      Console.WriteLine("0x{0} converts to {1}.", value, targetNumber)
   End If    
Catch e As OverflowException
   Console.WriteLine("Unable to convert '0x{0}' to an unsigned integer.", _
                     value)
End Try 
' Displays the following to the console:
'    Unable to convert '0x80000000' to an unsigned integer.    

ToUInt32(UInt64)

重要

此 API 不符合 CLS 規範。

將指定的 64 位元不帶正負號整數的值,轉換為相等的 32 位元不帶正負號整數。Converts the value of the specified 64-bit unsigned integer to an equivalent 32-bit unsigned integer.

public:
 static System::UInt32 ToUInt32(System::UInt64 value);
[System.CLSCompliant(false)]
public static uint ToUInt32 (ulong value);
static member ToUInt32 : uint64 -> uint32
Public Shared Function ToUInt32 (value As ULong) As UInteger

參數

value
UInt64

要轉換之 64 位元不帶正負號的整數。The 64-bit unsigned integer to convert.

傳回

value 相等的 32 位元不帶正負號的整數。A 32-bit unsigned integer that is equivalent to value.

屬性

例外狀況

value 大於 MaxValuevalue is greater than MaxValue.

範例

下列範例會嘗試將不帶正負號的長整數陣列中的每個元素轉換成不帶正負號的整數值。The following example attempts to convert each element in an unsigned long integer array to an unsigned integer value.

ulong[] numbers = { UInt64.MinValue, 121, 340, UInt64.MaxValue };
uint result;
foreach (ulong number in numbers)
{
   try {
      result = Convert.ToUInt32(number);
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                        number.GetType().Name, number,
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("The {0} value {1} is outside the range of the UInt32 type.",
                        number.GetType().Name, number);
   }
}
// The example displays the following output:
//    Converted the UInt64 value 0 to the UInt32 value 0.
//    Converted the UInt64 value 121 to the UInt32 value 121.
//    Converted the UInt64 value 340 to the UInt32 value 340.
//    The UInt64 value 18446744073709551615 is outside the range of the UInt32 type.
Dim numbers() As ULong = { UInt64.MinValue, 121, 340, UInt64.MaxValue }
Dim result As UInteger

For Each number As ULong In numbers
   Try
      result = Convert.ToUInt32(number)
      Console.WriteLine("Converted the {0} value {1} to a {2} value {3}.", _
                        number.GetType().Name, number, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("The {0} value {1} is outside the range of the UInt32 type.", _
                        number.GetType().Name, number)
   End Try
Next
' The example displays the following output:
'    Converted the UInt64 value 0 to a UInt32 value 0.
'    Converted the UInt64 value 121 to a UInt32 value 121.
'    Converted the UInt64 value 340 to a UInt32 value 340.
'    The UInt64 value 18446744073709551615 is outside the range of the UInt32 type.

ToUInt32(UInt32)

重要

此 API 不符合 CLS 規範。

傳回指定的 32 位元不帶正負號整數;不會執行實際的轉換。Returns the specified 32-bit unsigned integer; no actual conversion is performed.

public:
 static System::UInt32 ToUInt32(System::UInt32 value);
[System.CLSCompliant(false)]
public static uint ToUInt32 (uint value);
static member ToUInt32 : uint32 -> uint32
Public Shared Function ToUInt32 (value As UInteger) As UInteger

參數

value
UInt32

要傳回之 32 位元不帶正負號的整數。The 32-bit unsigned integer to return.

傳回

value 會原封不動地傳回。value is returned unchanged.

屬性

ToUInt32(UInt16)

重要

此 API 不符合 CLS 規範。

將指定的 16 位元不帶正負號整數的值,轉換為相等的 32 位元不帶正負號的整數。Converts the value of the specified 16-bit unsigned integer to the equivalent 32-bit unsigned integer.

public:
 static System::UInt32 ToUInt32(System::UInt16 value);
[System.CLSCompliant(false)]
public static uint ToUInt32 (ushort value);
static member ToUInt32 : uint16 -> uint32
Public Shared Function ToUInt32 (value As UShort) As UInteger

參數

value
UInt16

要轉換之 16 位元不帶正負號的整數。The 16-bit unsigned integer to convert.

傳回

value 相等的 32 位元不帶正負號的整數。A 32-bit unsigned integer that is equivalent to value.

屬性

範例

下列範例會將不帶正負號的16位整數陣列中的每個元素轉換成不帶正負號的整數值。The following example converts each element in an unsigned 16-bit integer array to an unsigned integer value.

ushort[] numbers = { UInt16.MinValue, 121, 340, UInt16.MaxValue };
uint result;
foreach (ushort number in numbers)
{
   result = Convert.ToUInt32(number);
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                     number.GetType().Name, number,
                     result.GetType().Name, result);
}
// The example displays the following output:
//    Converted the UInt16 value 0 to the UInt32 value 0.
//    Converted the UInt16 value 121 to the UInt32 value 121.
//    Converted the UInt16 value 340 to the UInt32 value 340.
//    Converted the UInt16 value 65535 to the UInt32 value 65535.
Dim numbers() As UShort = { UInt16.MinValue, 121, 340, UInt16.MaxValue }
Dim result As UInteger

For Each number As UShort In numbers
   result = Convert.ToUInt32(number)
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
                     number.GetType().Name, number, _
                     result.GetType().Name, result)
Next
' The example displays the following output:
'    Converted the UInt16 value 0 to the UInt32 value 0.
'    Converted the UInt16 value 121 to the UInt32 value 121.
'    Converted the UInt16 value 340 to the UInt32 value 340.
'    Converted the UInt16 value 65535 to the UInt32 value 65535.      

ToUInt32(String)

重要

此 API 不符合 CLS 規範。

將指定之數字的字串表示,轉換為相等的 32 位元不帶正負號的整數。Converts the specified string representation of a number to an equivalent 32-bit unsigned integer.

public:
 static System::UInt32 ToUInt32(System::String ^ value);
[System.CLSCompliant(false)]
public static uint ToUInt32 (string value);
static member ToUInt32 : string -> uint32
Public Shared Function ToUInt32 (value As String) As UInteger

參數

value
String

字串,包含要轉換的數字。A string that contains the number to convert.

傳回

value 中之數字相等的 32 位元不帶正負號的整數;如果 valuenull,則為 0 (零)。A 32-bit unsigned integer that is equivalent to the number in value, or 0 (zero) if value is null.

屬性

例外狀況

value 不是由後面接著一連串數字 (0 到 9) 的任意符號所組成。value does not consist of an optional sign followed by a sequence of digits (0 through 9).

value 代表小於 MinValue 或大於 MaxValue 的數字。value represents a number that is less than MinValue or greater than MaxValue.

範例

下列範例會將字串陣列中的元素解讀為數值字串,並嘗試將它們轉換成不帶正負號的整數。The following example interprets the elements in a string array as numeric strings and attempts to convert them to unsigned integers.

string[] values = { "One", "1.34e28", "-26.87", "-18", "-6.00",
                    " 0", "137", "1601.9", Int32.MaxValue.ToString() };
uint result;

foreach (string value in values)
{
   try {
      result = Convert.ToUInt32(value);
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                        value.GetType().Name, value, 
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("The {0} value '{1}' is outside the range of the UInt32 type.",
                        value.GetType().Name, value);
   }   
   catch (FormatException) {
      Console.WriteLine("The {0} value '{1}' is not in a recognizable format.",
                        value.GetType().Name, value);
   }   
}                                 
// The example displays the following output:
//    The String value 'One' is not in a recognizable format.
//    The String value '1.34e28' is not in a recognizable format.
//    The String value '-26.87' is not in a recognizable format.
//    The String value '-18' is outside the range of the UInt32 type.
//    The String value '-6.00' is not in a recognizable format.
//    Converted the String value ' 0' to the UInt32 value 0.
//    Converted the String value '137' to the UInt32 value 137.
//    The String value '1601.9' is not in a recognizable format.
//    Converted the String value '2147483647' to the UInt32 value 2147483647.
Dim values() As String = { "One", "1.34e28", "-26.87", "-18", "-6.00", _
                           " 0", "137", "1601.9", Int32.MaxValue.ToString() }
Dim result As UInteger

For Each value As String In values
   Try
      result = Convert.ToUInt32(value)
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                        value.GetType().Name, value, result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("The {0} value {1} is outside the range of the UInt32 type.", _
                        value.GetType().Name, value)
   Catch e As FormatException
      Console.WriteLine("The {0} value '{1}' is not in a recognizable format.", _
                        value.GetType().Name, value)
   End Try   
Next                                 
' The example displays the following output:
'    The String value 'One' is not in a recognizable format.
'    The String value '1.34e28' is not in a recognizable format.
'    The String value '-26.87' is not in a recognizable format.
'    The String value -18 is outside the range of the UInt32 type.
'    The String value '-6.00' is not in a recognizable format.
'    Converted the String value ' 0' to the UInt32 value 0.
'    Converted the String value '137' to the UInt32 value 137.
'    The String value '1601.9' is not in a recognizable format.
'    Converted the String value '2147483647' to the UInt32 value 2147483647.

備註

使用 ToUInt32(String) 方法相當於將 value 傳遞至 UInt32.Parse(String) 方法。Using the ToUInt32(String) method is equivalent to passing value to the UInt32.Parse(String) method. value 是使用目前執行緒文化特性的格式化慣例來解譯。value is interpreted by using the formatting conventions of the current thread culture.

如果您不想在轉換失敗時處理例外狀況,您可以改為呼叫 UInt32.TryParse 方法。If you prefer not to handle an exception if the conversion fails, you can call the UInt32.TryParse method instead. 它會傳回 Boolean 值,指出轉換是否成功或失敗。It returns a Boolean value that indicates whether the conversion succeeded or failed.

ToUInt32(SByte)

重要

此 API 不符合 CLS 規範。

將指定的 8 位元帶正負號整數的值,轉換為相等的 32 位元不帶正負號整數。Converts the value of the specified 8-bit signed integer to the equivalent 32-bit unsigned integer.

public:
 static System::UInt32 ToUInt32(System::SByte value);
[System.CLSCompliant(false)]
public static uint ToUInt32 (sbyte value);
static member ToUInt32 : sbyte -> uint32
Public Shared Function ToUInt32 (value As SByte) As UInteger

參數

value
SByte

要轉換的 8 位元帶正負號的整數。The 8-bit signed integer to convert.

傳回

value 相等的 32 位元不帶正負號的整數。A 32-bit unsigned integer that is equivalent to value.

屬性

例外狀況

value 小於零。value is less than zero.

範例

下列範例會嘗試將帶正負號的位元組陣列中的每個元素轉換成不帶正負號的整數。The following example attempts to convert each element in a signed byte array to an unsigned integer.

sbyte[] numbers = { SByte.MinValue, -1, 0, 10, SByte.MaxValue };
uint result;

foreach (sbyte number in numbers)
{
   try {
      result = Convert.ToUInt32(number);
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                        number.GetType().Name, number,
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("The {0} value {1} is outside the range of the UInt32 type.",
                        number.GetType().Name, number);
   }                    
}
// The example displays the following output:
//    The SByte value -128 is outside the range of the UInt32 type.
//    The SByte value -1 is outside the range of the UInt32 type.
//    Converted the SByte value 0 to the UInt32 value 0.
//    Converted the SByte value 10 to the UInt32 value 10.
//    Converted the SByte value 127 to the UInt32 value 127.
Dim numbers() As SByte = { SByte.MinValue, -1, 0, 10, SByte.MaxValue }
Dim result As UInteger

For Each number As SByte In numbers
   Try
      result = Convert.ToUInt32(number)
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
                        number.GetType().Name, number, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("The {0} value {1} is outside the range of the UInt32 type.", _
                        number.GetType().Name, number)         
   End Try
Next
' The example displays the following output:
'    The SByte value -128 is outside the range of the UInt32 type.
'    The SByte value -1 is outside the range of the UInt32 type.
'    Converted the SByte value 0 to the UInt32 value 0.
'    Converted the SByte value 10 to the UInt32 value 10.
'    Converted the SByte value 127 to the UInt32 value 127.

ToUInt32(Char)

重要

此 API 不符合 CLS 規範。

將指定的 Unicode 字元值轉換為相等的 32 位元不帶正負號的整數。Converts the value of the specified Unicode character to the equivalent 32-bit unsigned integer.

public:
 static System::UInt32 ToUInt32(char value);
[System.CLSCompliant(false)]
public static uint ToUInt32 (char value);
static member ToUInt32 : char -> uint32
Public Shared Function ToUInt32 (value As Char) As UInteger

參數

value
Char

要轉換的 Unicode 字元。The Unicode character to convert.

傳回

value 相等的 32 位元不帶正負號的整數。A 32-bit unsigned integer that is equivalent to value.

屬性

範例

下列範例會將字元陣列中的每個元素轉換成不帶正負號的整數。The following example converts each element in a character array to an unsigned integer.

char[] chars = { 'a', 'z', '\u0007', '\u03FF',
                 '\u7FFF', '\uFFFE' };
uint result;
                        
foreach (char ch in chars)
{
   result = Convert.ToUInt32(ch);
   Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                     ch.GetType().Name, ch,
                     result.GetType().Name, result);
}   
// The example displays the following output:
//    Converted the Char value 'a' to the UInt32 value 97.
//    Converted the Char value 'z' to the UInt32 value 122.
//    Converted the Char value '' to the UInt32 value 7.
//    Converted the Char value '?' to the UInt32 value 1023.
//    Converted the Char value '?' to the UInt32 value 32767.
//    Converted the Char value '?' to the UInt32 value 65534.
Dim chars() As Char = { "a"c, "z"c, ChrW(7), ChrW(1023), _
                        ChrW(Short.MaxValue), ChrW(&hFFFE) }
Dim result As UInteger
                        
For Each ch As Char in chars
   result = Convert.ToUInt32(ch)
   Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                     ch.GetType().Name, ch, _
                     result.GetType().Name, result)
Next   
' The example displays the following output:
'    Converted the Char value 'a' to the UInt32 value 97.
'    Converted the Char value 'z' to the UInt32 value 122.
'    Converted the Char value '' to the UInt32 value 7.
'    Converted the Char value '?' to the UInt32 value 1023.
'    Converted the Char value '?' to the UInt32 value 32767.
'    Converted the Char value '?' to the UInt32 value 65534.

ToUInt32(Int64)

重要

此 API 不符合 CLS 規範。

將指定的 64 位元帶正負號的整數值轉換為相等的 32 位元不帶正負號的整數。Converts the value of the specified 64-bit signed integer to an equivalent 32-bit unsigned integer.

public:
 static System::UInt32 ToUInt32(long value);
[System.CLSCompliant(false)]
public static uint ToUInt32 (long value);
static member ToUInt32 : int64 -> uint32
Public Shared Function ToUInt32 (value As Long) As UInteger

參數

value
Int64

要轉換的 64 位元帶正負號的整數。The 64-bit signed integer to convert.

傳回

value 相等的 32 位元不帶正負號的整數。A 32-bit unsigned integer that is equivalent to value.

屬性

例外狀況

value 小於零或大於 MaxValuevalue is less than zero or greater than MaxValue.

範例

下列範例會嘗試將長整數陣列中的每個元素轉換成不帶正負號的整數。The following example attempts to convert each element in a long integer array to an unsigned integer.

long[] numbers = { Int64.MinValue, -1, 0, 121, 340, Int64.MaxValue };
uint result;
foreach (long number in numbers)
{
   try {
      result = Convert.ToUInt32(number);
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                        number.GetType().Name, number,
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("The {0} value {1} is outside the range of the UInt32 type.",
                        number.GetType().Name, number);
   }
}
// The example displays the following output:
//    The Int64 value -9223372036854775808 is outside the range of the UInt32 type.
//    The Int64 value -1 is outside the range of the UInt32 type.
//    Converted the Int64 value 0 to the UInt32 value 0.
//    Converted the Int64 value 121 to the UInt32 value 121.
//    Converted the Int64 value 340 to the UInt32 value 340.
//    The Int64 value 9223372036854775807 is outside the range of the UInt32 type.
Dim numbers() As Long = { Int64.MinValue, -1, 0, 121, 340, Int64.MaxValue }
Dim result As UInteger
For Each number As Long In numbers
   Try
      result = Convert.ToUInt32(number)
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
                        number.GetType().Name, number, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("The {0} value {1} is outside the range of the UInt32 type.", _
                        number.GetType().Name, number)
   End Try
Next
' The example displays the following output:
'    The Int64 value -9223372036854775808 is outside the range of the UInt32 type.
'    The Int64 value -1 is outside the range of the UInt32 type.
'    Converted the Int64 value 0 to the UInt32 value 0.
'    Converted the Int64 value 121 to the UInt32 value 121.
'    Converted the Int64 value 340 to the UInt32 value 340.
'    The Int64 value 9223372036854775807 is outside the range of the UInt32 type.

ToUInt32(Int32)

重要

此 API 不符合 CLS 規範。

將指定的 32 位元帶正負號的整數值轉換為相等的 32 位元不帶正負號的整數。Converts the value of the specified 32-bit signed integer to an equivalent 32-bit unsigned integer.

public:
 static System::UInt32 ToUInt32(int value);
[System.CLSCompliant(false)]
public static uint ToUInt32 (int value);
static member ToUInt32 : int -> uint32
Public Shared Function ToUInt32 (value As Integer) As UInteger

參數

value
Int32

要轉換的 32 位元帶正負號的整數。The 32-bit signed integer to convert.

傳回

value 相等的 32 位元不帶正負號的整數。A 32-bit unsigned integer that is equivalent to value.

屬性

例外狀況

value 小於零。value is less than zero.

範例

下列範例會嘗試將整數陣列中的每個元素轉換成不帶正負號的整數。The following example attempts to convert each element in an integer array to an unsigned integer.

int[] numbers = { Int32.MinValue, -1203, 0, 121, 1340, Int32.MaxValue };
uint result;
foreach (int number in numbers)
{
   try {
      result = Convert.ToUInt32(number);
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                        number.GetType().Name, number,
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("The {0} value {1} is outside the range of the UInt32 type.",
                        number.GetType().Name, number);
   }
}
// The example displays the following output:
//    The Int32 value -2147483648 is outside the range of the UInt32 type.
//    The Int32 value -1203 is outside the range of the UInt32 type.
//    Converted the Int32 value 0 to the UInt32 value 0.
//    Converted the Int32 value 121 to the UInt32 value 121.
//    Converted the Int32 value 1340 to the UInt32 value 1340.
//    Converted the Int32 value 2147483647 to the UInt32 value 2147483647.
Dim numbers() As Integer = { Int32.MinValue, -1203, 0, 121, 1340, Int32.MaxValue }
Dim result As UInteger
For Each number As Integer In numbers
   Try
      result = Convert.ToUInt32(number)
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
                        number.GetType().Name, number, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("The {0} value {1} is outside the range of the UInt32 type.", _
                        number.GetType().Name, number)
   End Try
Next
' The example displays the following output:
'    The Int32 value -2147483648 is outside the range of the UInt32 type.
'    The Int32 value -1203 is outside the range of the UInt32 type.
'    Converted the Int32 value 0 to the UInt32 value 0.
'    Converted the Int32 value 121 to the UInt32 value 121.
'    Converted the Int32 value 1340 to the UInt32 value 1340.
'    Converted the Int32 value 2147483647 to the UInt32 value 2147483647.

ToUInt32(Int16)

重要

此 API 不符合 CLS 規範。

將指定的 16 位元帶正負號整數的值,轉換為相等的 32 位元不帶正負號整數。Converts the value of the specified 16-bit signed integer to the equivalent 32-bit unsigned integer.

public:
 static System::UInt32 ToUInt32(short value);
[System.CLSCompliant(false)]
public static uint ToUInt32 (short value);
static member ToUInt32 : int16 -> uint32
Public Shared Function ToUInt32 (value As Short) As UInteger

參數

value
Int16

要轉換的 16 位元帶正負號的整數。The 16-bit signed integer to convert.

傳回

value 相等的 32 位元不帶正負號的整數。A 32-bit unsigned integer that is equivalent to value.

屬性

例外狀況

value 小於零。value is less than zero.

範例

下列範例會嘗試將16位整數陣列中的每個元素轉換成不帶正負號的整數。The following example attempts to convert each element in a 16-bit integer array to an unsigned integer.

short[] numbers= { Int16.MinValue, -1, 0, 121, 340, Int16.MaxValue };
uint result;

foreach (short number in numbers)
{
   try {
      result = Convert.ToUInt32(number);
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                           number.GetType().Name, number,
                           result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("The {0} value {1} is outside the range of the UInt32 type.",
                        number.GetType().Name, number);
   }
}
// The example displays the following output:
//    The Int16 value -32768 is outside the range of the UInt32 type.
//    The Int16 value -1 is outside the range of the UInt32 type.
//    Converted the Int16 value 0 to the UInt32 value 0.
//    Converted the Int16 value 121 to the UInt32 value 121.
//    Converted the Int16 value 340 to the UInt32 value 340.
//    Converted the Int16 value 32767 to the UInt32 value 32767.
Dim numbers() As Short = { Int16.MinValue, -1, 0, 121, 340, Int16.MaxValue }
Dim result As UInteger

For Each number As Short In numbers
   Try
      result = Convert.ToUInt32(number)
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
                           number.GetType().Name, number, _
                           result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("The {0} value {1} is outside the range of the UInt32 type.", _
                        number.GetType().Name, number) 
   End Try
Next
' The example displays the following output:
'    The Int16 value -32768 is outside the range of the UInt32 type.
'    The Int16 value -1 is outside the range of the UInt32 type.
'    Converted the Int16 value 0 to the UInt32 value 0.
'    Converted the Int16 value 121 to the UInt32 value 121.
'    Converted the Int16 value 340 to the UInt32 value 340.
'    Converted the Int16 value 32767 to the UInt32 value 32767.

ToUInt32(Double)

重要

此 API 不符合 CLS 規範。

將指定之雙精確度浮點數的值,轉換為相等的 32 位元不帶正負號的整數。Converts the value of the specified double-precision floating-point number to an equivalent 32-bit unsigned integer.

public:
 static System::UInt32 ToUInt32(double value);
[System.CLSCompliant(false)]
public static uint ToUInt32 (double value);
static member ToUInt32 : double -> uint32
Public Shared Function ToUInt32 (value As Double) As UInteger

參數

value
Double

要轉換的雙精確度浮點數。The double-precision floating-point number to convert.

傳回

value,四捨五入為最接近的 32 位元不帶正負號整數。value, rounded to the nearest 32-bit unsigned integer. 如果 value 介於兩個整數正中間時,則傳回偶數;也就是 4.5 會轉換為 4,5.5 會轉換為 6。If value is halfway between two whole numbers, the even number is returned; that is, 4.5 is converted to 4, and 5.5 is converted to 6.

屬性

例外狀況

value 小於零或大於 MaxValuevalue is less than zero or greater than MaxValue.

範例

下列範例會嘗試將 Double 值陣列中的每個元素轉換成不帶正負號的整數。The following example attempts to convert each element in an array of Double values to an unsigned integer.

double[] values= { Double.MinValue, -1.38e10, -1023.299, -12.98,
                   0, 9.113e-16, 103.919, 17834.191, Double.MaxValue };
uint result;

foreach (double value in values)
{
   try {
      result = Convert.ToUInt32(value);
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                        value.GetType().Name, value,
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("The {0} value {1} is outside the range of the UInt32 type.",
                        value.GetType().Name, value);
   }   
}                                 
// The example displays the following output:
//    The Double value -1.79769313486232E+308 is outside the range of the UInt32 type.
//    The Double value -13800000000 is outside the range of the UInt32 type.
//    The Double value -1023.299 is outside the range of the UInt32 type.
//    The Double value -12.98 is outside the range of the UInt32 type.
//    Converted the Double value '0' to the UInt32 value 0.
//    Converted the Double value '9.113E-16' to the UInt32 value 0.
//    Converted the Double value '103.919' to the UInt32 value 104.
//    Converted the Double value '17834.191' to the UInt32 value 17834.
//    The Double value 1.79769313486232E+308 is outside the range of the UInt32 type.
Dim values() As Double = { Double.MinValue, -1.38e10, -1023.299, -12.98, _
                           0, 9.113e-16, 103.919, 17834.191, Double.MaxValue }
Dim result As UInteger

For Each value As Double In values
   Try
      result = Convert.ToUInt32(value)
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                        value.GetType().Name, value, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("The {0} value {1} is outside the range of the UInt32 type.", _
                        value.GetType().Name, value)
   End Try   
Next         
' The example displays the following output:                        
'    The Double value -1.79769313486232E+308 is outside the range of the UInt32 type.
'    The Double value -13800000000 is outside the range of the UInt32 type.
'    The Double value -1023.299 is outside the range of the UInt32 type.
'    The Double value -12.98 is outside the range of the UInt32 type.
'    Converted the Double value '0' to the UInt32 value 0.
'    Converted the Double value '9.113E-16' to the UInt32 value 0.
'    Converted the Double value '103.919' to the UInt32 value 104.
'    Converted the Double value '17834.191' to the UInt32 value 17834.
'    The Double value 1.79769313486232E+308 is outside the range of the UInt32 type.

另請參閱

ToUInt32(Decimal)

重要

此 API 不符合 CLS 規範。

將指定之十進位數字的值,轉換為相等的 32 位元不帶正負號的整數。Converts the value of the specified decimal number to an equivalent 32-bit unsigned integer.

public:
 static System::UInt32 ToUInt32(System::Decimal value);
[System.CLSCompliant(false)]
public static uint ToUInt32 (decimal value);
static member ToUInt32 : decimal -> uint32
Public Shared Function ToUInt32 (value As Decimal) As UInteger

參數

value
Decimal

要轉換的十進位數字。The decimal number to convert.

傳回

value,四捨五入為最接近的 32 位元不帶正負號整數。value, rounded to the nearest 32-bit unsigned integer. 如果 value 介於兩個整數正中間時,則傳回偶數;也就是 4.5 會轉換為 4,5.5 會轉換為 6。If value is halfway between two whole numbers, the even number is returned; that is, 4.5 is converted to 4, and 5.5 is converted to 6.

屬性

例外狀況

value 小於零或大於 MaxValuevalue is less than zero or greater than MaxValue.

範例

下列範例會嘗試將 Decimal 值陣列中的每個元素轉換成不帶正負號的整數。The following example attempts to convert each element in an array of Decimal values to an unsigned integer.

decimal[] values= { Decimal.MinValue, -1034.23m, -12m, 0m, 147m,
                    199.55m, 9214.16m, Decimal.MaxValue };
uint result;

foreach (decimal value in values)
{
   try {
      result = Convert.ToUInt32(value);
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.",
                        value.GetType().Name, value,
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("The {0} value {1} is outside the range of the UInt32 type.",
                        value.GetType().Name, value);
   }   
}                                  
// The example displays the following output:
//    The Decimal value -79228162514264337593543950335 is outside the range of the UInt32 type.
//    The Decimal value -1034.23 is outside the range of the UInt32 type.
//    The Decimal value -12 is outside the range of the UInt32 type.
//    Converted the Decimal value '0' to the UInt32 value 0.
//    Converted the Decimal value '147' to the UInt32 value 147.
//    Converted the Decimal value '199.55' to the UInt32 value 200.
//    Converted the Decimal value '9214.16' to the UInt32 value 9214.
//    The Decimal value 79228162514264337593543950335 is outside the range of the UInt32 type.
Dim values() As Decimal = { Decimal.MinValue, -1034.23d, -12d, 0d, 147d, _
                            199.55d, 9214.16d, Decimal.MaxValue }
Dim result As UInteger

For Each value As Decimal In values
   Try
      result = Convert.ToUInt32(value)
      Console.WriteLine("Converted the {0} value '{1}' to the {2} value {3}.", _
                        value.GetType().Name, value, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("{0} is outside the range of the UInt32 type.", _
                        value)
   End Try   
Next                                  
' The example displays the following output:
'    -79228162514264337593543950335 is outside the range of the UInt32 type.
'    -1034.23 is outside the range of the UInt32 type.
'    -12 is outside the range of the UInt32 type.
'    Converted the Decimal value '0' to the UInt32 value 0.
'    Converted the Decimal value '147' to the UInt32 value 147.
'    Converted the Decimal value '199.55' to the UInt32 value 200.
'    Converted the Decimal value '9214.16' to the UInt32 value 9214.
'    79228162514264337593543950335 is outside the range of the UInt32 type.

另請參閱

ToUInt32(DateTime)

重要

此 API 不符合 CLS 規範。

呼叫這個方法一律會擲回 InvalidCastExceptionCalling this method always throws InvalidCastException.

public:
 static System::UInt32 ToUInt32(DateTime value);
[System.CLSCompliant(false)]
public static uint ToUInt32 (DateTime value);
static member ToUInt32 : DateTime -> uint32
Public Shared Function ToUInt32 (value As DateTime) As UInteger

參數

value
DateTime

要轉換的日期和時間值。The date and time value to convert.

傳回

不支援這個轉換。This conversion is not supported. 沒有傳回值。No value is returned.

屬性

例外狀況

不支援這個轉換。This conversion is not supported.

ToUInt32(Byte)

重要

此 API 不符合 CLS 規範。

將指定的 8 位元不帶正負號整數的值,轉換為相等的 32 位元不帶正負號的整數。Converts the value of the specified 8-bit unsigned integer to the equivalent 32-bit unsigned integer.

public:
 static System::UInt32 ToUInt32(System::Byte value);
[System.CLSCompliant(false)]
public static uint ToUInt32 (byte value);
static member ToUInt32 : byte -> uint32
Public Shared Function ToUInt32 (value As Byte) As UInteger

參數

value
Byte

要轉換之 8 位元不帶正負號的整數。The 8-bit unsigned integer to convert.

傳回

value 相等的 32 位元不帶正負號的整數。A 32-bit unsigned integer that is equivalent to value.

屬性

範例

下列範例會將位元組陣列中的每個元素轉換成不帶正負號的整數。The following example converts each element in a byte array to an unsigned integer.

byte[] bytes = { Byte.MinValue, 14, 122, Byte.MaxValue};
uint result;

foreach (byte byteValue in bytes)
{
   result = Convert.ToUInt32(byteValue);
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                     byteValue.GetType().Name, byteValue,
                     result.GetType().Name, result);
}
// The example displays the following output:
//    Converted the Byte value 0 to the UInt32 value 0.
//    Converted the Byte value 14 to the UInt32 value 14.
//    Converted the Byte value 122 to the UInt32 value 122.
//    Converted the Byte value 255 to the UInt32 value 255.
Dim bytes() As Byte = { Byte.MinValue, 14, 122, Byte.MaxValue}
Dim result As UInteger

For Each byteValue As Byte In bytes
   result = Convert.ToUInt32(byteValue)
   Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
                     byteValue.GetType().Name, byteValue, _
                     result.GetType().Name, result)
Next
' The example displays the following output:
'    Converted the Byte value 0 to the UInt32 value 0.
'    Converted the Byte value 14 to the UInt32 value 14.
'    Converted the Byte value 122 to the UInt32 value 122.
'    Converted the Byte value 255 to the UInt32 value 255.

ToUInt32(Boolean)

重要

此 API 不符合 CLS 規範。

將指定的布林值轉換為相等的 32 位元不帶正負號的整數。Converts the specified Boolean value to the equivalent 32-bit unsigned integer.

public:
 static System::UInt32 ToUInt32(bool value);
[System.CLSCompliant(false)]
public static uint ToUInt32 (bool value);
static member ToUInt32 : bool -> uint32
Public Shared Function ToUInt32 (value As Boolean) As UInteger

參數

value
Boolean

要轉換的布林值。The Boolean value to convert.

傳回

如果 valuetrue,則為數字 1,否則為 0。The number 1 if value is true; otherwise, 0.

屬性

範例

下列範例會將布林值 truefalse 轉換成不帶正負號的整數。The following example converts the Boolean values true and false to unsigned integers.

bool falseFlag = false;
bool trueFlag = true;

Console.WriteLine("{0} converts to {1}.", falseFlag,
                  Convert.ToUInt32(falseFlag));
Console.WriteLine("{0} converts to {1}.", trueFlag,
                  Convert.ToUInt32(trueFlag));
// The example displays the following output:
//       False converts to 0.
//       True converts to 1.
Dim falseFlag As Boolean = False
Dim trueFlag As Boolean = True

Console.WriteLine("{0} converts to {1}.", falseFlag, _
                  Convert.ToUInt32(falseFlag))
Console.WriteLine("{0} converts to {1}.", trueFlag, _
                  Convert.ToUInt32(trueFlag))
' The example displays the following output:
'       False converts to 0.
'       True converts to 1.

ToUInt32(Object)

重要

此 API 不符合 CLS 規範。

將指定之物件的值轉換為 32 位元不帶正負號的整數。Converts the value of the specified object to a 32-bit unsigned integer.

public:
 static System::UInt32 ToUInt32(System::Object ^ value);
[System.CLSCompliant(false)]
public static uint ToUInt32 (object value);
static member ToUInt32 : obj -> uint32
Public Shared Function ToUInt32 (value As Object) As UInteger

參數

value
Object

實作 IConvertible 介面的物件,或是 nullAn object that implements the IConvertible interface, or null.

傳回

value 相等的 32 位元不帶正負號的整數;如果 valuenull,則為 0 (零)。A 32-bit unsigned integer that is equivalent to value, or 0 (zero) if value is null.

屬性

例外狀況

value 的格式不正確。value is not in an appropriate format.

value 未實作 IConvertible 介面。value does not implement the IConvertible interface.

-或--or- 不支援轉換。The conversion is not supported.

value 代表小於 MinValue 或大於 MaxValue 的數字。value represents a number that is less than MinValue or greater than MaxValue.

範例

下列範例會嘗試將物件陣列中的每個元素轉換成不帶正負號的整數。The following example attempts to convert each element in an object array to an unsigned integer.

object[] values = { true, -12, 163, 935, 'x', new DateTime(2009, 5, 12),
                    "104", "103.0", "-1",
                    "1.00e2", "One", 1.00e2, 16.3e42};
uint result;

foreach (object value in values)
{
   try {
      result = Convert.ToUInt32(value);
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.",
                        value.GetType().Name, value,
                        result.GetType().Name, result);
   }
   catch (OverflowException) {
      Console.WriteLine("The {0} value '{1}' is outside the range of the UInt32 type.",
                        value.GetType().Name, value);
   }                     
   catch (FormatException) {
      Console.WriteLine("The {0} value {1} is not in a recognizable format.",
                        value.GetType().Name, value);
   }
   catch (InvalidCastException) {
      Console.WriteLine("No conversion to a UInt32 exists for the {0} value '{1}'.",
                        value.GetType().Name, value);
                        
   }
}                           
// The example displays the following output:
//    Converted the Boolean value True to the UInt32 value 1.
//    The Int32 value '-12' is outside the range of the UInt32 type.
//    Converted the Int32 value 163 to the UInt32 value 163.
//    Converted the Int32 value 935 to the UInt32 value 935.
//    Converted the Char value x to the UInt32 value 120.
//    No conversion to a UInt32 exists for the DateTime value '5/12/2009 12:00:00 AM'.
//    Converted the String value 104 to the UInt32 value 104.
//    The String value 103.0 is not in a recognizable format.
//    The String value '-1' is outside the range of the UInt32 type.
//    The String value 1.00e2 is not in a recognizable format.
//    The String value One is not in a recognizable format.
//    Converted the Double value 100 to the UInt32 value 100.
//    The Double value '1.63E+43' is outside the range of the UInt32 type.
Dim values() As Object = { True, -12, 163, 935, "x"c, #5/12/2009#, _
                           "104", "103.0", "-1", _
                           "1.00e2", "One", 1.00e2, 16.3e42}
Dim result As UInteger

For Each value As Object In values
   Try
      result = Convert.ToUInt32(value)
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", _
                        value.GetType().Name, value, _
                        result.GetType().Name, result)
   Catch e As OverflowException
      Console.WriteLine("The {0} value {1} is outside the range of the UInt32 type.", _
                        value.GetType().Name, value)
   Catch e As FormatException
      Console.WriteLine("The {0} value {1} is not in a recognizable format.", _
                        value.GetType().Name, value)
   Catch e As InvalidCastException
      Console.WriteLine("No conversion to a UInt32 exists for the {0} value {1}.", _
                        value.GetType().Name, value)
                        
   End Try
Next                           
' The example displays the following output:
'    Converted the Boolean value True to the UInt32 value 1.
'    The Int32 value -12 is outside the range of the UInt32 type.
'    Converted the Int32 value 163 to the UInt32 value 163.
'    Converted the Int32 value 935 to the UInt32 value 935.
'    Converted the Char value x to the UInt32 value 120.
'    No conversion to a UInt32 exists for the DateTime value 5/12/2009 12:00:00 AM.
'    Converted the String value 104 to the UInt32 value 104.
'    The String value 103.0 is not in a recognizable format.
'    The String value -1 is outside the range of the UInt32 type.
'    The String value 1.00e2 is not in a recognizable format.
'    The String value One is not in a recognizable format.
'    Converted the Double value 100 to the UInt32 value 100.
'    The Double value 1.63E+43 is outside the range of the UInt32 type.

備註

傳回值是叫用 value基礎類型之 IConvertible.ToUInt32 方法的結果。The return value is the result of invoking the IConvertible.ToUInt32 method of the underlying type of value.

適用於