BitConverter.ToInt32 Method

public:
 static int ToInt32(cli::array <System::Byte> ^ value, int startIndex);

public static int ToInt32 (byte[] value, int startIndex);

static member ToInt32 : byte[] * int -> int

Public Shared Function ToInt32 (value As Byte(), startIndex As Integer) As Integer

Parameters

Returns

Int32

A 32-bit signed integer formed by four bytes beginning at startIndex.

Exceptions

Examples

The following example uses the ToInt32 method to create Int32 values from a four-byte array and from the upper four bytes of an eight-byte array. It also uses the GetBytes(Int32) and ToInt32 methods to round-trip an Int32 value.

using System;

public class Example
{
   public static void Main()
   {
      // Create an Integer from a 4-byte array.
      Byte[] bytes1 = { 0xEC, 0x00, 0x00, 0x00 };
      Console.WriteLine("{0}--> 0x{1:X4} ({1:N0})", FormatBytes(bytes1),
                                      BitConverter.ToInt32(bytes1, 0));
      // Create an Integer from the upper four bytes of a byte array.
      Byte[] bytes2 = BitConverter.GetBytes(Int64.MaxValue / 2);
      Console.WriteLine("{0}--> 0x{1:X4} ({1:N0})", FormatBytes(bytes2),
                                      BitConverter.ToInt32(bytes2, 4));

      // Round-trip an integer value.
      int original = (int) Math.Pow(16, 3);
      Byte[] bytes3 = BitConverter.GetBytes(original);
      int restored = BitConverter.ToInt32(bytes3, 0);
      Console.WriteLine("0x{0:X4} ({0:N0}) --> {1} --> 0x{2:X4} ({2:N0})", original,
                        FormatBytes(bytes3), restored);
   }

   private static string FormatBytes(Byte[] bytes)
   {
       string value = "";
       foreach (var byt in bytes)
          value += String.Format("{0:X2} ", byt);

       return value;
   }
}
// The example displays the following output:
//       EC 00 00 00 --> 0x00EC (236)
//       FF FF FF FF FF FF FF 3F --> 0x3FFFFFFF (1,073,741,823)
//       0x1000 (4,096) --> 00 10 00 00  --> 0x1000 (4,096)

Module Example
   Public Sub Main()
      ' Create an Integer from a 4-byte array.
      Dim bytes1() As Byte = { &hEC, &h00, &h00, &h00 }
      Console.WriteLine("{0}--> 0x{1:X4} ({1:N0})", FormatBytes(bytes1),
                                      BitConverter.ToInt32(bytes1, 0))
      ' Create an Integer from the upper four bytes of a byte array.
      Dim bytes2() As Byte = BitConverter.GetBytes(Int64.MaxValue \ 2)
      Console.WriteLine("{0}--> 0x{1:X4} ({1:N0})", FormatBytes(bytes2),
                                      BitConverter.ToInt32(bytes2, 4))
      
      ' Round-trip an integer value.
      Dim original As Integer = CInt(16^3)
      Dim bytes3() As Byte = BitConverter.GetBytes(original)
      Dim restored As Integer = BitConverter.ToInt32(bytes3, 0)
      Console.WriteLine("0x{0:X4} ({0:N0}) --> {1} --> 0x{2:X4} ({2:N0})", original, 
                        FormatBytes(bytes3), restored)
   End Sub
   
   Private Function FormatBytes(bytes() As Byte) As String
       Dim value As String = ""
       For Each byt In bytes
          value += String.Format("{0:X2} ", byt)
       Next
       Return value
   End Function
End Module
' The example displays the following output:
'       EC 00 00 00 --> 0x00EC (236)
'       FF FF FF FF FF FF FF 3F --> 0x3FFFFFFF (1,073,741,823)
'       0x1000 (4,096) --> 00 10 00 00  --> 0x1000 (4,096)

Remarks

The ToInt32 method converts the bytes from index startIndex to startIndex + 3 to an Int32 value. The order of bytes in the array must reflect the endianness of the computer system's architecture; for more information, see the Remarks section of BitConverter.

See also

• GetBytes(Int32)

public:
 static int ToInt32(ReadOnlySpan<System::Byte> value);

public static int ToInt32 (ReadOnlySpan<byte> value);

static member ToInt32 : ReadOnlySpan<byte> -> int

Public Shared Function ToInt32 (value As ReadOnlySpan(Of Byte)) As Integer

Parameters

Returns

Int32

A 32-bit signed integer representing the converted bytes.

Exceptions