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BitConverter.ToInt32 Method

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

Namespace: System
Assembly: mscorlib (in mscorlib.dll)

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

Parameters

value

An array of bytes.

startIndex

The starting position within value.

Return Value

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

Exception typeCondition

ArgumentNullException

value is a null reference (Nothing in Visual Basic).

ArgumentOutOfRangeException

startIndex is less than zero or greater than the length of value minus 4.

The following code example converts elements of Byte arrays to Int32 values with the ToInt32 method.

// Example of the BitConverter.ToInt32 method.
using System;

class BytesToInt32Demo
{
    const string formatter = "{0,5}{1,17}{2,15}";
 
    // Convert four byte array elements to an int and display it.
    public static void BAToInt32( byte[ ] bytes, int index )
    {
        int value = BitConverter.ToInt32( bytes, index );

        Console.WriteLine( formatter, index, 
            BitConverter.ToString( bytes, index, 4 ), value );
    }

    // Display a byte array, using multiple lines if necessary.
    public static void WriteMultiLineByteArray( byte[ ] bytes )
    {
        const int rowSize = 20;
        int iter;

        Console.WriteLine( "initial byte array" );
        Console.WriteLine( "------------------" );

        for( iter = 0; iter < bytes.Length - rowSize; iter += rowSize )
        {
            Console.Write( 
                BitConverter.ToString( bytes, iter, rowSize ) );
            Console.WriteLine( "-" );
        }

        Console.WriteLine( BitConverter.ToString( bytes, iter ) );
        Console.WriteLine( );
    }

    public static void Main( )
    {
        byte[ ] byteArray = {
             15,   0,   0,   0,   0, 128,   0,   0,  16,   0, 
              0, 240, 255,   0, 202, 154,  59,   0,  54, 101, 
            196, 241, 255, 255, 255, 127 };

        Console.WriteLine( 
            "This example of the BitConverter.ToInt32( byte[ ], " +
            "int ) \nmethod generates the following output. It " +
            "converts elements \nof a byte array to int values.\n" );

        WriteMultiLineByteArray( byteArray );

        Console.WriteLine( formatter, "index", "array elements", 
            "int" );
        Console.WriteLine( formatter, "-----", "--------------", 
            "---" );
          
        // Convert byte array elements to int values.
        BAToInt32( byteArray, 1 );
        BAToInt32( byteArray, 0 );
        BAToInt32( byteArray, 21 );
        BAToInt32( byteArray, 6 );
        BAToInt32( byteArray, 9 );
        BAToInt32( byteArray, 13 );
        BAToInt32( byteArray, 17 );
        BAToInt32( byteArray, 22 );
        BAToInt32( byteArray, 2 );
    }
}

/*
This example of the BitConverter.ToInt32( byte[ ], int )
method generates the following output. It converts elements
of a byte array to int values.

initial byte array
------------------
0F-00-00-00-00-80-00-00-10-00-00-F0-FF-00-CA-9A-3B-00-36-65-
C4-F1-FF-FF-FF-7F

index   array elements            int
-----   --------------            ---
    1      00-00-00-00              0
    0      0F-00-00-00             15
   21      F1-FF-FF-FF            -15
    6      00-00-10-00        1048576
    9      00-00-F0-FF       -1048576
   13      00-CA-9A-3B     1000000000
   17      00-36-65-C4    -1000000000
   22      FF-FF-FF-7F     2147483647
    2      00-00-00-80    -2147483648
*/

// Example of the BitConverter.ToInt32 method.
import System.*;

class BytesToInt32Demo
{
    private static String formatter = "{0,5}{1,17}{2,15}";

    // Convert four byte array elements to an int and display it.
    public static void BAToInt32(ubyte bytes[], int index)
    {
        int value = BitConverter.ToInt32(bytes, index);
        Console.WriteLine(formatter, (Int32)index, 
            BitConverter.ToString(bytes, index, 4), (Int32)value);
    } //BAToInt32

    // Display a byte array, using multiple lines if necessary.
    public static void WriteMultiLineByteArray(ubyte bytes[])
    {
        final int rowSize = 20;
        int iter;

        Console.WriteLine("initial byte array");
        Console.WriteLine("------------------");
    
        for (iter = 0; iter < bytes.length - rowSize; iter += rowSize) {
            Console.Write(BitConverter.ToString(bytes, iter, rowSize));
            Console.WriteLine("-");
        }

        Console.WriteLine(BitConverter.ToString(bytes, iter));
        Console.WriteLine();
    } //WriteMultiLineByteArray

    public static void main(String[] args)
    {
        ubyte byteArray[] = { 15, 0, 0, 0, 0, 128, 0, 0, 16, 0, 0, 240, 255, 0, 
            202, 154, 59, 0, 54, 101, 196, 241, 255, 255, 255, 127 };

        Console.WriteLine(("This example of the "
            + "BitConverter.ToInt32( byte[ ], int ) \n"
            + "method generates the following output. " 
            + "It converts elements \nof a byte array to int values.\n"));

        WriteMultiLineByteArray(byteArray);
        Console.WriteLine(formatter, "index", "array elements", "int");
        Console.WriteLine(formatter, "-----", "--------------", "---");

        // Convert byte array elements to int values.
        BAToInt32(byteArray, 1);
        BAToInt32(byteArray, 0);
        BAToInt32(byteArray, 21);
        BAToInt32(byteArray, 6);
        BAToInt32(byteArray, 9);
        BAToInt32(byteArray, 13);
        BAToInt32(byteArray, 17);
        BAToInt32(byteArray, 22);
        BAToInt32(byteArray, 2);
    } //main
} //BytesToInt32Demo

/*
This example of the BitConverter.ToInt32( byte[ ], int )
method generates the following output. It converts elements
of a byte array to int values.

initial byte array
------------------
0F-00-00-00-00-80-00-00-10-00-00-F0-FF-00-CA-9A-3B-00-36-65-
C4-F1-FF-FF-FF-7F

index   array elements            int
-----   --------------            ---
    1      00-00-00-00              0
    0      0F-00-00-00             15
   21      F1-FF-FF-FF            -15
    6      00-00-10-00        1048576
    9      00-00-F0-FF       -1048576
   13      00-CA-9A-3B     1000000000
   17      00-36-65-C4    -1000000000
   22      FF-FF-FF-7F     2147483647
    2      00-00-00-80    -2147483648
*/

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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