C# BitConverter ToInt32

Description

BitConverter ToInt32 returns a 32-bit signed integer converted from four bytes at a specified position in a byte array.

Syntax

BitConverter.ToInt32 has the following syntax.


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

Parameters

BitConverter.ToInt32 has the following parameters.

value - An array of bytes.
startIndex - The starting position within value.

Returns

BitConverter.ToInt32 method returns A 32-bit signed integer formed by four bytes beginning at startIndex.

Example

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.


/*from   w  w  w  .  j av a 2 s .  c  o m*/
using System;

public class Example
{
   public static void Main()
   {
      Byte[] bytes1 = { 0xEC, 0x00, 0x00, 0x00 };
      Console.WriteLine("{0}--> 0x{1:X4} ({1:N0})", FormatBytes(bytes1),
                                      BitConverter.ToInt32(bytes1, 0));

      Byte[] bytes2 = BitConverter.GetBytes(Int64.MaxValue / 2);
      Console.WriteLine("{0}--> 0x{1:X4} ({1:N0})", FormatBytes(bytes2),
                                      BitConverter.ToInt32(bytes2, 4));

      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 code above generates the following result.