Single.ToString 方法

定義

將這個執行個體的數值轉換為它的相等字串表示。Converts the numeric value of this instance to its equivalent string representation.

多載

ToString(String, IFormatProvider)

使用指定的格式和特定文化特性格式資訊,將這個執行個體的數值轉換成它的相等字串表示。Converts the numeric value of this instance to its equivalent string representation using the specified format and culture-specific format information.

ToString(String)

使用指定格式,將這個執行個體的數值轉換成它的相等字串表示。Converts the numeric value of this instance to its equivalent string representation, using the specified format.

ToString(IFormatProvider)

使用指定的特定文化特性格式資訊,將這個執行個體的數值轉換成它的相等字串表示。Converts the numeric value of this instance to its equivalent string representation using the specified culture-specific format information.

ToString()

將這個執行個體的數值轉換為它的相等字串表示。Converts the numeric value of this instance to its equivalent string representation.

ToString(String, IFormatProvider)

使用指定的格式和特定文化特性格式資訊,將這個執行個體的數值轉換成它的相等字串表示。Converts the numeric value of this instance to its equivalent string representation using the specified format and culture-specific format information.

public:
 virtual System::String ^ ToString(System::String ^ format, IFormatProvider ^ provider);
public string ToString (string format, IFormatProvider provider);
override this.ToString : string * IFormatProvider -> string
Public Function ToString (format As String, provider As IFormatProvider) As String

參數

format
String

數值格式字串。A numeric format string.

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

這個執行個體值的字串表示,如同 formatprovider 所指定。The string representation of the value of this instance as specified by format and provider.

實作

範例

下列範例會針對數個不同的文化特性,使用每個支援的標準數值格式規範來顯示 Single 值。The following example displays a Single value using each of the supported standard numeric format specifiers for several different cultures.

float value = 16325.62901F;
string specifier;
CultureInfo culture;

// Use standard numeric format specifiers.
specifier = "G";
culture = CultureInfo.CreateSpecificCulture("eu-ES");
Console.WriteLine(value.ToString(specifier, culture));
// Displays:    16325,62901
Console.WriteLine(value.ToString(specifier, CultureInfo.InvariantCulture));
// Displays:    16325.62901

specifier = "C";
culture = CultureInfo.CreateSpecificCulture("en-US");
Console.WriteLine(value.ToString(specifier, culture));
// Displays:    $16,325.63
culture = CultureInfo.CreateSpecificCulture("en-GB");
Console.WriteLine(value.ToString(specifier, culture));
// Displays:    £16,325.63

specifier = "E04";
culture = CultureInfo.CreateSpecificCulture("sv-SE");
Console.WriteLine(value.ToString(specifier, culture));
// Displays: 1,6326E+004   
 culture = CultureInfo.CreateSpecificCulture("en-NZ");
 Console.WriteLine(value.ToString(specifier, culture));
// Displays:    1.6326E+004   

specifier = "F";
culture = CultureInfo.CreateSpecificCulture("fr-FR");
Console.WriteLine(value.ToString(specifier, culture));
// Displays:    16325,63
culture = CultureInfo.CreateSpecificCulture("en-CA");
Console.WriteLine(value.ToString(specifier, culture));
// Displays:    16325.63

specifier = "N";
culture = CultureInfo.CreateSpecificCulture("es-ES");
Console.WriteLine(value.ToString(specifier, culture));
// Displays:    16.325,63
culture = CultureInfo.CreateSpecificCulture("fr-CA");
Console.WriteLine(value.ToString(specifier, culture));
// Displays:    16 325,63

specifier = "P";
culture = CultureInfo.InvariantCulture;
Console.WriteLine((value/10000).ToString(specifier, culture));
// Displays:    163.26 %
culture = CultureInfo.CreateSpecificCulture("ar-EG");
Console.WriteLine((value/10000).ToString(specifier, culture));
// Displays:    163.256 %
Dim value As Single = 16325.62901
Dim specifier As String
Dim culture As CultureInfo

' Use standard numeric format specifiers.
specifier = "G"
culture = CultureInfo.CreateSpecificCulture("eu-ES")
Console.WriteLine(value.ToString(specifier, culture))
' Displays:    16325,62901
Console.WriteLine(value.ToString(specifier, CultureInfo.InvariantCulture))
' Displays:    16325.62901

specifier = "C"
culture = CultureInfo.CreateSpecificCulture("en-US")
Console.WriteLine(value.ToString(specifier, culture))
' Displays:    $16,325.63
culture = CultureInfo.CreateSpecificCulture("en-GB")
Console.WriteLine(value.ToString(specifier, culture))
' Displays:    £16,325.63

specifier = "E04"
culture = CultureInfo.CreateSpecificCulture("sv-SE")
Console.WriteLine(value.ToString(specifier, culture))
' Displays: 1,6326E+004   
 culture = CultureInfo.CreateSpecificCulture("en-NZ")
 Console.WriteLine(value.ToString(specifier, culture))
' Displays:    1.6326E+004   

specifier = "F"
culture = CultureInfo.CreateSpecificCulture("fr-FR")
Console.WriteLine(value.ToString(specifier, culture))
' Displays:    16325,63
culture = CultureInfo.CreateSpecificCulture("en-CA")
Console.WriteLine(value.ToString(specifier, culture))
' Displays:    16325.63

specifier = "N"
culture = CultureInfo.CreateSpecificCulture("es-ES")
Console.WriteLine(value.ToString(specifier, culture))
' Displays:    16.325,63
culture = CultureInfo.CreateSpecificCulture("fr-CA")
Console.WriteLine(value.ToString(specifier, culture))
' Displays:    16 325,63

specifier = "P"
culture = CultureInfo.InvariantCulture
Console.WriteLine((value/10000).ToString(specifier, culture))
' Displays:    163.26 %
culture = CultureInfo.CreateSpecificCulture("ar-EG")
Console.WriteLine((value/10000).ToString(specifier, culture))
' Displays:    163.256 %

備註

ToString(String, IFormatProvider) 方法會使用指定之文化特性的指定格式來格式化 Single 值。The ToString(String, IFormatProvider) method formats a Single value in a specified format of a specified culture. 如果您想要使用預設格式或文化特性設定,請使用 ToString 方法的其他多載,如下所示:If you want to use default format or culture settings, use the other overloads of the ToString method, as follows:

若要使用格式To use format 針對文化特性For culture 使用多載Use the overload
預設值("G")格式Default ("G") format 預設(目前)文化特性Default (current) culture ToString()
預設值("G")格式Default ("G") format 特定文化特性A specific culture ToString(IFormatProvider)
特定格式A specific format 預設(目前)文化特性Default (current) culture ToString(String)

傳回值可以是 PositiveInfinitySymbolNegativeInfinitySymbolNaNSymbol或目前實例值的字串表示,如 format所指定。The return value can be PositiveInfinitySymbol, NegativeInfinitySymbol, NaNSymbol, or the string representation of the value of the current instance, as specified by format.

format 參數可以是任何有效的標準數值格式規範,但 D 和 X 除外,以及任何自訂數值格式指定名稱的組合。The format parameter can be any valid standard numeric format specifier except for D and X, as well as any combination of custom numeric format specifiers. 如果 formatnull 或空字串,則會使用一般數值格式規範("G")來格式化這個實例的傳回值。If format is null or an empty string, the return value for this instance is formatted with the general numeric format specifier ("G").

.NET Framework 提供廣泛的格式設定支援,在下列格式設定主題中有更詳細的說明:The .NET Framework provides extensive formatting support, which is described in greater detail in the following formatting topics:

provider 參數是 IFormatProvider 的實作為,其 GetFormat 方法會傳回 NumberFormatInfo 物件。The provider parameter is an IFormatProvider implementation whose GetFormat method returns a NumberFormatInfo object. 一般來說,providerCultureInfo 物件或 NumberFormatInfo 物件。Typically, provider is a CultureInfo object or a NumberFormatInfo object. provider 參數提供格式化時使用的文化特性(culture)特定資訊。The provider parameter supplies culture-specific information used in formatting. 如果 null``provider,則會使用目前文化特性的 NumberFormatInfo 物件來格式化傳回值。If provider is null, the return value is formatted with the NumberFormatInfo object for the current culture.

根據預設,傳回值只包含7位數的精確度,雖然在內部維護最多9位數。By default, the return value only contains 7 digits of precision although a maximum of 9 digits is maintained internally. 如果這個實例的值大於7位數,ToString 會傳回 PositiveInfinitySymbolNegativeInfinitySymbol,而不是預期的數目。If the value of this instance has greater than 7 digits, ToString returns PositiveInfinitySymbol or NegativeInfinitySymbol instead of the expected number. 如果您需要更精確的精確度,請指定具有 "G9" 格式規格的 format,其一律會傳回9位數的精確度,或 "R",如果數位只能以最大有效位數表示,則會傳回7位數。If you require more precision, specify format with the "G9" format specification, which always returns 9 digits of precision, or "R", which returns 7 digits if the number can be represented with that precision or 9 digits if the number can only be represented with maximum precision.

另請參閱

ToString(String)

使用指定格式,將這個執行個體的數值轉換成它的相等字串表示。Converts the numeric value of this instance to its equivalent string representation, using the specified format.

public:
 System::String ^ ToString(System::String ^ format);
public string ToString (string format);
override this.ToString : string -> string
Public Function ToString (format As String) As String

參數

format
String

數值格式字串。A numeric format string.

傳回

這個執行個體值的字串表示,如同 format 所指定。The string representation of the value of this instance as specified by format.

例外狀況

format 無效。format is invalid.

範例

下列範例會定義一個數值,並使用 "C" 標準數值格式字串,並將其格式化為貨幣值,方法是使用 "N" 標準數值格式字串,並將值設為三位數的數值。The following example defines a numeric value and formats it as a currency value by using the "C" standard numeric format string and as a numeric value to three decimal places by using the "N" standard numeric format string. 結果字串會使用 en-us 文化特性的慣例來格式化。The result strings are formatted by using the conventions of the en-US culture. 如需數值格式字串的詳細資訊,請參閱標準數值格式字串自訂數值格式字串For more information on numeric format strings, see Standard Numeric Format Strings and Custom Numeric Format Strings.

using System;

public class Example
{
   public static void Main()
   {
      Double number = 1764.3789;
      
      // Format as a currency value.
      Console.WriteLine(number.ToString("C"));
      
      // Format as a numeric value with 3 decimal places.
      Console.WriteLine(number.ToString("N3"));
   }
}
// The example displays the following output:
//       $1,764.38
//       1,764.379
Module Example
   Public Sub Main()
      Dim number As Single = 1764.3789
      
      ' Format as a currency value.
      Console.WriteLine(number.ToString("C"))
      
      ' Format as a numeric value with 3 decimal places.
      Console.WriteLine(number.ToString("N3"))
   End Sub
End Module
' The example displays the following output:
'       $1,764.38
'       1,764.379

下列範例會使用每個支援的標準數值格式規範,以及兩個自訂數值格式字串,顯示數個 Single 值。The following example displays several Single values using each of the supported standard numeric format specifiers together with two custom numeric format strings. 其中一個自訂格式字串說明如何以前置零填補 Single 值。One of those custom format strings illustrates how to pad a Single value with leading zeros. 在將數值轉換成字串時,此範例會使用 en-us 文化特性的格式設定慣例。In converting the numeric values to strings, the example uses the formatting conventions of the en-US culture.

float[] numbers= { 1054.32179F, -195489100.8377F, 1.0437E21F, 
                   -1.0573e-05F };
string[] specifiers = { "C", "E", "e", "F", "G", "N", "P", 
                        "R", "#,000.000", "0.###E-000",
                        "000,000,000,000.00###" };

foreach (float number in numbers)
{
   Console.WriteLine("Formatting of {0}:", number);
   foreach (string specifier in specifiers)
      Console.WriteLine("   {0,5}: {1}", 
                        specifier, number.ToString(specifier));

   Console.WriteLine();
}
// The example displays the following output to the console:
//       Formatting of 1054.32179:
//              C: $1,054.32
//              E: 1.054322E+003
//              e: 1.054322e+003
//              F: 1054.32
//              G: 1054.32179
//              N: 1,054.32
//              P: 105,432.18 %
//              R: 1054.32179
//          #,000.000: 1,054.322
//          0.###E-000: 1.054E003
//          000,000,000,000.00###: 000,000,001,054.322
//       
//       Formatting of -195489100.8377:
//              C: ($195,489,100.84)
//              E: -1.954891E+008
//              e: -1.954891e+008
//              F: -195489100.84
//              G: -195489100.8377
//              N: -195,489,100.84
//              P: -19,548,910,083.77 %
//              R: -195489100.8377
//          #,000.000: -195,489,100.838
//          0.###E-000: -1.955E008
//          000,000,000,000.00###: -000,195,489,100.00
//       
//       Formatting of 1.0437E+21:
//              C: $1,043,700,000,000,000,000,000.00
//              E: 1.043700E+021
//              e: 1.043700e+021
//              F: 1043700000000000000000.00
//              G: 1.0437E+21
//              N: 1,043,700,000,000,000,000,000.00
//              P: 104,370,000,000,000,000,000,000.00 %
//              R: 1.0437E+21
//          #,000.000: 1,043,700,000,000,000,000,000.000
//          0.###E-000: 1.044E021
//          000,000,000,000.00###: 1,043,700,000,000,000,000,000.00
//       
//       Formatting of -1.0573E-05:
//              C: $0.00
//              E: -1.057300E-005
//              e: -1.057300e-005
//              F: 0.00
//              G: -1.0573E-05
//              N: 0.00
//              P: 0.00 %
//              R: -1.0573E-05
//          #,000.000: 000.000
//          0.###E-000: -1.057E-005
//          000,000,000,000.00###: -000,000,000,000.00001 
Dim numbers() As Single = {1054.32179, -195489100.8377, 1.0437E21, _
                           -1.0573e-05}
Dim specifiers() As String = { "C", "E", "e", "F", "G", "N", "P", _
                               "R", "#,000.000", "0.###E-000", _
                               "000,000,000,000.00###"}
For Each number As Single In numbers
   Console.WriteLine("Formatting of {0}:", number)
   For Each specifier As String In specifiers
      Console.WriteLine("   {0,5}: {1}", _
                        specifier, number.ToString(specifier))
   Next
   Console.WriteLine()
Next
' The example displays the following output to the console:
'       Formatting of 1054.32179:
'              C: $1,054.32
'              E: 1.054322E+003
'              e: 1.054322e+003
'              F: 1054.32
'              G: 1054.32179
'              N: 1,054.32
'              P: 105,432.18 %
'              R: 1054.32179
'          #,000.000: 1,054.322
'          0.###E-000: 1.054E003
'          000,000,000,000.00###: 000,000,001,054.322      
'       
'       Formatting of -195489100.8377:
'              C: ($195,489,100.84)
'              E: -1.954891E+008
'              e: -1.954891e+008
'              F: -195489100.84
'              G: -195489100.8377
'              N: -195,489,100.84
'              P: -19,548,910,083.77 %
'              R: -195489100.8377
'          #,000.000: -195,489,100.838
'          0.###E-000: -1.955E008
'          000,000,000,000.00###: -000,195,489,100.00
'       
'       Formatting of 1.0437E+21:
'              C: $1,043,700,000,000,000,000,000.00
'              E: 1.043700E+021
'              e: 1.043700e+021
'              F: 1043700000000000000000.00
'              G: 1.0437E+21
'              N: 1,043,700,000,000,000,000,000.00
'              P: 104,370,000,000,000,000,000,000.00 %
'              R: 1.0437E+21
'          #,000.000: 1,043,700,000,000,000,000,000.000
'          0.###E-000: 1.044E021
'          000,000,000,000.00###: 1,043,700,000,000,000,000,000.00
'       
'       Formatting of -1.0573E-05:
'              C: $0.00
'              E: -1.057300E-005
'              e: -1.057300e-005
'              F: 0.00
'              G: -1.0573E-05
'              N: 0.00
'              P: 0.00 %
'              R: -1.0573E-05
'          #,000.000: 000.000
'          0.###E-000: -1.057E-005
'          000,000,000,000.00###: -000,000,000,000.00001

備註

ToString(String) 方法會使用目前文化特性的慣例,以指定的格式來格式化 Single 的值。The ToString(String) method formats a Single value in a specified format by using the conventions of the current culture. 如果您想要使用預設值("G" 或一般)格式或指定不同的文化特性,請使用 ToString 方法的其他多載,如下所示:If you want to use the default ("G", or general) format or specify a different culture, use the other overloads of the ToString method, as follows:

若要使用格式To use format 針對文化特性For culture 使用多載Use the overload
預設值("G")格式Default ("G") format 預設(目前)文化特性Default (current) culture ToString()
預設值("G")格式Default ("G") format 特定文化特性A specific culture ToString(IFormatProvider)
特定格式A specific format 特定文化特性A specific culture ToString(String, IFormatProvider)

傳回值可以是 PositiveInfinitySymbolNegativeInfinitySymbolNaNSymbol或目前實例值的字串表示,如 format所指定。The return value can be PositiveInfinitySymbol, NegativeInfinitySymbol, NaNSymbol, or the string representation of the value of the current instance, as specified by format.

format 參數可以是任何有效的標準數值格式規範,但 D 和 X 除外,以及任何自訂數值格式指定名稱的組合。The format parameter can be any valid standard numeric format specifier except for D and X, as well as any combination of custom numeric format specifiers. 如果格式為 null 或空字串,則傳回值會使用一般數值格式規範("G")進行格式化。If format is null or an empty string, the return value is formatted with the general numeric format specifier ("G").

.NET Framework 提供廣泛的格式設定支援,在下列格式設定主題中有更詳細的說明:The .NET Framework provides extensive formatting support, which is described in greater detail in the following formatting topics:

根據預設,傳回值只包含7位數的精確度,雖然在內部維護最多9位數。By default, the return value only contains 7 digits of precision although a maximum of 9 digits is maintained internally. 如果這個實例的值大於7位數,ToString(String) 會傳回 PositiveInfinitySymbolNegativeInfinitySymbol,而不是預期的數目。If the value of this instance has greater than 7 digits, ToString(String) returns PositiveInfinitySymbol or NegativeInfinitySymbol instead of the expected number. 如果您需要更精確的精確度,請指定具有 "G9" 格式規格的 format,其一律會傳回9位數的精確度,或 "R",如果數位只能以最大有效位數表示,則會傳回7位數。If you require more precision, specify format with the "G9" format specification, which always returns 9 digits of precision, or "R", which returns 7 digits if the number can be represented with that precision or 9 digits if the number can only be represented with maximum precision.

另請參閱

ToString(IFormatProvider)

使用指定的特定文化特性格式資訊,將這個執行個體的數值轉換成它的相等字串表示。Converts the numeric value of this instance to its equivalent string representation using the specified culture-specific format information.

public:
 System::String ^ ToString(IFormatProvider ^ provider);
public string ToString (IFormatProvider provider);
override this.ToString : IFormatProvider -> string
Public Function ToString (provider As IFormatProvider) As String

參數

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

這個執行個體值的字串表示,如同 provider 所指定。The string representation of the value of this instance as specified by provider.

實作

範例

下列範例會使用代表數個不同文化特性的 CultureInfo 物件,顯示兩個 Single 值的字串表示。The following example displays the string representation of two Single values using CultureInfo objects that represent several different cultures.

float value;

value = -16325.62015F;
// Display value using the invariant culture.
Console.WriteLine(value.ToString(CultureInfo.InvariantCulture));
// Display value using the en-GB culture.
Console.WriteLine(value.ToString(CultureInfo.CreateSpecificCulture("en-GB")));
// Display value using the de-DE culture.
Console.WriteLine(value.ToString(CultureInfo.CreateSpecificCulture("de-DE")));

value = 16034.125E21F;
// Display value using the invariant culture.
Console.WriteLine(value.ToString(CultureInfo.InvariantCulture));
// Display value using the en-GB culture.
Console.WriteLine(value.ToString(CultureInfo.CreateSpecificCulture("en-GB")));
// Display value using the de-DE culture.
Console.WriteLine(value.ToString(CultureInfo.CreateSpecificCulture("de-DE")));
// This example displays the following output to the console:
//       -16325.62015
//       -16325.62015
//       -16325,62015
//       1.6034125E+25
//       1.6034125E+25
//       1,6034125E+25
Dim value As Single 

value = -16325.62015
' Display value using the invariant culture.
Console.WriteLine(value.ToString(CultureInfo.InvariantCulture))
' Display value using the en-GB culture.
Console.WriteLine(value.ToString(CultureInfo.CreateSpecificCulture("en-GB")))
' Display value using the de-DE culture.
Console.WriteLine(value.ToString(CultureInfo.CreateSpecificCulture("de-DE")))

value = 16034.125E21
' Display value using the invariant culture.
Console.WriteLine(value.ToString(CultureInfo.InvariantCulture))
' Display value using the en-GB culture.
Console.WriteLine(value.ToString(CultureInfo.CreateSpecificCulture("en-GB")))
' Display value using the de-DE culture.
Console.WriteLine(value.ToString(CultureInfo.CreateSpecificCulture("de-DE")))
' This example displays the following output to the console:
'       -16325.62015
'       -16325.62015
'       -16325,62015
'       1.6034125E+25
'       1.6034125E+25
'       1,6034125E+25

備註

ToString(IFormatProvider) 方法會使用指定文化特性的預設("G" 或一般)格式來格式化 Single 值。The ToString(IFormatProvider) method formats a Single value in the default ("G", or general) format of a specified culture. 如果您想要指定不同的格式或目前的文化特性,請使用 ToString 方法的其他多載,如下所示:If you want to specify a different format or the current culture, use the other overloads of the ToString method, as follows:

若要使用格式To use format 針對文化特性For culture 使用多載Use the overload
預設值("G")格式Default ("G") format 預設(目前)文化特性Default (current) culture ToString()
特定格式A specific format 預設(目前)文化特性Default (current) culture ToString(String)
特定格式A specific format 特定文化特性A specific culture ToString(String, IFormatProvider)

傳回值可以是 PositiveInfinitySymbolNegativeInfinitySymbolNaNSymbol或格式的字串:The return value can be PositiveInfinitySymbol, NegativeInfinitySymbol, NaNSymbol, or a string of the form:

[sign] 整數位數 [.]小數-數位] [e [sign] 指數數位][sign]integral-digits[.[fractional-digits]][e[sign]exponential-digits]

選擇性元素會以方括弧([和])括住。Optional elements are framed in square brackets ([ and ]). 包含「數位」一詞的元素包含一連串的數位字元,範圍介於0到9之間。Elements containing the term "digits" consist of a series of numeric characters ranging from 0 to 9. 下表列出每個元素。The following table lists each element.

項目Element 描述Description
Signsign 負號或正號符號。A negative sign or positive sign symbol.
整數位數integral-digits 一系列的數位,指定數位的整數部分。A series of digits specifying the integral part of the number. 如果有小數數位,整數位數可能不存在。Integral-digits can be absent if there are fractional-digits.
'.''.' 文化特性特定的小數點符號。A culture-specific decimal point symbol.
小數數位fractional-digits 指定數位小數部分的一系列數位。A series of digits specifying the fractional part of the number.
'e' 小寫字元 ' e ',表示指數(科學)標記法。A lowercase character 'e', indicating exponential (scientific) notation.
指數-數位exponential-digits 指定指數的一系列數位。A series of digits specifying an exponent.

傳回值的一些範例包括 "100"、"-123456789"、"123.45 e + 6"、"500"、"3.1416"、"600"、"-0.123" 和 "-無限大"。Some examples of the return value are "100", "-123,456,789", "123.45e+6", "500", "3.1416", "600", "-0.123", and "-Infinity".

.NET Framework 提供廣泛的格式設定支援,在下列格式設定主題中有更詳細的說明:The .NET Framework provides extensive formatting support, which is described in greater detail in the following formatting topics:

provider 參數是 IFormatProvider 的實作為,其 GetFormat 方法會傳回 NumberFormatInfo 物件。The provider parameter is an IFormatProvider implementation whose GetFormat method returns a NumberFormatInfo object. 一般來說,providerCultureInfo 物件或 NumberFormatInfo 物件。Typically, provider is a CultureInfo object or a NumberFormatInfo object. provider 參數提供格式化時使用的文化特性(culture)特定資訊。The provider parameter supplies culture-specific information used in formatting. 如果 null``provider,則會使用目前文化特性的 NumberFormatInfo 資料來格式化傳回值。If provider is null, the return value is formatted using the NumberFormatInfo data for the current culture.

若要使用指定的文化特性和特定的格式字串,將 Single 值轉換為其字串表示,請呼叫 Single.ToString(String, IFormatProvider) 方法。To convert a Single value to its string representation using a specified culture and a specific format string, call the Single.ToString(String, IFormatProvider) method.

另請參閱

ToString()

將這個執行個體的數值轉換為它的相等字串表示。Converts the numeric value of this instance to its equivalent string representation.

public:
 override System::String ^ ToString();
public override string ToString ();
override this.ToString : unit -> string
Public Overrides Function ToString () As String

傳回

這個執行個體值的字串表示。The string representation of the value of this instance.

範例

下列範例會使用預設的 Single.ToString 方法來顯示一些 Single 值的字串表示。The following example uses the default Single.ToString method to display the string representations of a number of Single values.

float number;

number = 1.6E20F;
// Displays 1.6E+20.
Console.WriteLine(number.ToString());

number = 1.6E2F;
// Displays 160.
Console.WriteLine(number.ToString());

number = -3.541F;
// Displays -3.541.
Console.WriteLine(number.ToString());

number = -1502345222199E-07F;
// Displays -150234.5222199.
Console.WriteLine(number.ToString());

number = -15023452221990199574E-09F;
// Displays -15023452221.9902.
Console.WriteLine(number.ToString());

number = .60344F;
// Displays 0.60344.
Console.WriteLine(number.ToString());

number = .000000001F;
// Displays 1E-09.
Console.WriteLine(number.ToString());
Dim number As Single

number = 1.6E20
' Displays 1.6E+20.      
Console.WriteLine(number.ToString())

number = 1.6E2
' Displays 160.
Console.WriteLine(number.ToString())

number = -3.541
' Displays -3.541.
Console.WriteLine(number.ToString())

number = -1502345222199E-07
' Displays -150234.5222199.
Console.WriteLine(number.ToString())

number = -15023452221990199574E-09
' Displays -15023452221.9902.
Console.WriteLine(number.ToString())

number = .60344
' Displays 0.60344.
Console.WriteLine(number.ToString())

number = .000000001
' Displays 1E-09.
Console.WriteLine(number.ToString())

下列程式碼範例說明如何使用 Parse(String) 方法以及 ToString() 方法。The following code example illustrates the use of the Parse(String) method along with the ToString() method.

bool done = false;
String^ inp;
do
{
   Console::Write( "Enter a real number: " );
   inp = Console::ReadLine();
   try
   {
      s = Single::Parse( inp );
      Console::WriteLine( "You entered {0}.", s );
      done = true;
   }
   catch ( FormatException^ ) 
   {
      Console::WriteLine( "You did not enter a number." );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "An exception occurred while parsing your response: {0}", e );
   }
}
while (  !done );
bool done = false;
string inp;
do
{
    Console.Write("Enter a real number: ");
    inp = Console.ReadLine();
    try
    {
        s = Single.Parse(inp);
        Console.WriteLine("You entered {0}.", s.ToString());
        done = true;
    }
    catch (FormatException)
    {
        Console.WriteLine("You did not enter a number.");
    }
    catch (Exception e)
    {
        Console.WriteLine("An exception occurred while parsing your response: {0}", e.ToString());
    }
} while (!done);
Dim Done As Boolean = False
Dim Inp As String
Do

    Console.Write("Enter a real number: ")
    Inp = Console.ReadLine()
    Try
        S = Single.Parse(Inp)
        Console.WriteLine("You entered " + S.ToString() + ".")
        Done = True
    Catch E As FormatException
        Console.WriteLine("You did not enter a number.")
    Catch E As Exception
        Console.WriteLine("An exception occurred while parsing your response: " + E.ToString())
    End Try
Loop While Not Done

備註

ToString() 方法會以目前文化特性的預設("G" 或一般)格式來格式化 Single 值。The ToString() method formats a Single value in the default ("G", or general) format of the current culture. 如果您想要指定不同的格式或文化特性,請使用 ToString 方法的其他多載,如下所示:If you want to specify a different format or culture, use the other overloads of the ToString method, as follows:

若要使用格式To use format 針對文化特性For culture 使用多載Use the overload
預設值("G")格式Default ("G") format 特定文化特性A specific culture ToString(IFormatProvider)
特定格式A specific format 預設(目前)文化特性Default (current) culture ToString(String)
特定格式A specific format 特定文化特性A specific culture ToString(String, IFormatProvider)

傳回值可以是 PositiveInfinitySymbolNegativeInfinitySymbolNaNSymbol或格式的字串:The return value can be PositiveInfinitySymbol, NegativeInfinitySymbol, NaNSymbol, or a string of the form:

[sign] 整數位數 [.]小數-數位] [e [sign] 指數數位][sign]integral-digits[.[fractional-digits]][e[sign]exponential-digits]

選擇性元素會以方括弧([和])括住。Optional elements are framed in square brackets ([ and ]). 包含「數位」一詞的元素包含一連串的數位字元,範圍介於0到9之間。Elements that contain the term "digits" consist of a series of numeric characters ranging from 0 to 9. 下表列出每個元素:The following table lists each element:

項目Element 描述Description
簽署sign 負號或正號符號。A negative sign or positive sign symbol.
整數位數integral-digits 一系列的數位,指定數位的整數部分。A series of digits specifying the integral part of the number. 如果有小數數位,整數位數可能不存在。Integral-digits can be absent if there are fractional-digits.
'.''.' 文化特性特定的小數點符號。A culture-specific decimal point symbol.
小數數位fractional-digits 指定數位小數部分的一系列數位。A series of digits specifying the fractional part of the number.
'e' 小寫字元 ' e ',表示指數(科學)標記法。A lowercase character 'e', indicating exponential (scientific) notation.
指數-數位exponential-digits 指定指數的一系列數位。A series of digits specifying an exponent.

傳回值的一些範例包括 "100"、"-123456789"、"123.45 e + 6"、"500"、"3.1416"、"600"、"-0.123" 和 "-無限大"。Some examples of the return value are "100", "-123,456,789", "123.45e+6", "500", "3.1416", "600", "-0.123", and "-Infinity".

.NET Framework 提供廣泛的格式設定支援,在下列格式設定主題中有更詳細的說明:The .NET Framework provides extensive formatting support, which is described in greater detail in the following formatting topics:

另請參閱

適用於