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BitConverter.ToUInt32 Method

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

This method is not CLS-compliant.  

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

[CLSCompliantAttribute(false)] 
public static uint ToUInt32 (
	byte[] value,
	int startIndex
)
/** @attribute CLSCompliantAttribute(false) */ 
public static UInt32 ToUInt32 (
	byte[] value, 
	int startIndex
)
CLSCompliantAttribute(false) 
public static function ToUInt32 (
	value : byte[], 
	startIndex : int
) : uint
Not applicable.

Parameters

value

An array of bytes.

startIndex

The starting position within value.

Return Value

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

Exception typeCondition

ArgumentException

startIndex is greater than or equal to the length of value minus 3, and is less than or equal to the length of value minus 1.

ArgumentNullException

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

ArgumentOutOfRangeException

startIndex is less than zero or greater than the length of value minus 1.

The following code example converts elements of Byte arrays to UInt32 values with the ToUInt32 method.

// Example of the BitConverter.ToUInt32 method.
using System;

class BytesToUInt32Demo
{
    const string formatter = "{0,5}{1,17}{2,15}";
 
    // Convert four byte array elements to a uint and display it.
    public static void BAToUInt32( byte[ ] bytes, int index )
    {
        uint value = BitConverter.ToUInt32( bytes, index );

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

    public static void Main( )
    {
        byte[ ] byteArray = {
             15,   0,   0,   0,   0,  16,   0, 255,   3,   0, 
              0, 202, 154,  59, 255, 255, 255, 255, 127 };

        Console.WriteLine( 
            "This example of the BitConverter.ToUInt32( byte[ ], " +
            "int ) \nmethod generates the following output. It " +
            "converts elements \nof a byte array to uint values.\n" );
        Console.WriteLine( "initial byte array" );
        Console.WriteLine( "------------------" );
        Console.WriteLine( BitConverter.ToString( byteArray ) );
        Console.WriteLine( );
        Console.WriteLine( formatter, "index", "array elements", 
            "uint" );
        Console.WriteLine( formatter, "-----", "--------------", 
            "----" );
          
        // Convert byte array elements to uint values.
        BAToUInt32( byteArray, 1 );
        BAToUInt32( byteArray, 0 );
        BAToUInt32( byteArray, 7 );
        BAToUInt32( byteArray, 3 );
        BAToUInt32( byteArray, 10 );
        BAToUInt32( byteArray, 15 );
        BAToUInt32( byteArray, 14 );
    }
}

/*
This example of the BitConverter.ToUInt32( byte[ ], int )
method generates the following output. It converts elements
of a byte array to uint values.

initial byte array
------------------
0F-00-00-00-00-10-00-FF-03-00-00-CA-9A-3B-FF-FF-FF-FF-7F

index   array elements           uint
-----   --------------           ----
    1      00-00-00-00              0
    0      0F-00-00-00             15
    7      FF-03-00-00           1023
    3      00-00-10-00        1048576
   10      00-CA-9A-3B     1000000000
   15      FF-FF-FF-7F     2147483647
   14      FF-FF-FF-FF     4294967295
*/

// Example of the BitConverter.ToUInt32 method.
import System.*;

class BytesToUInt32Demo
{
    private static String formatter = "{0,5}{1,17}{2,15}";

    // Convert four byte array elements to a uint and display it.
    public static void BAToUInt32(ubyte bytes[], int index)
    {
        UInt32 value = BitConverter.ToUInt32(bytes, index);
        Console.WriteLine(formatter, (Int32)index, 
            BitConverter.ToString(bytes, index, 4), (UInt32)value);
    } //BAToUInt32

    public static void main(String[] args)
    {
        ubyte byteArray[] =  { 15, 0, 0, 0, 0, 16, 0, 255, 3, 0, 0, 202, 154, 
                                59, 255, 255, 255, 255, 127 };

        Console.WriteLine("This example of the "
            + "BitConverter.ToUInt32( byte[ ], int ) \n"
            + "method generates the following output. " 
            + "It converts elements \nof a byte array to uint values.\n");
        Console.WriteLine("initial byte array");
        Console.WriteLine("------------------");
        Console.WriteLine(BitConverter.ToString(byteArray));
        Console.WriteLine();
        Console.WriteLine(formatter, "index", "array elements", "uint");
        Console.WriteLine(formatter, "-----", "--------------", "----");

        // Convert byte array elements to uint values.
        BAToUInt32(byteArray, 1);
        BAToUInt32(byteArray, 0);
        BAToUInt32(byteArray, 7);
        BAToUInt32(byteArray, 3);
        BAToUInt32(byteArray, 10);
        BAToUInt32(byteArray, 15);
        BAToUInt32(byteArray, 14);
    } //main
}//BytesToUInt32Demo

/*
This example of the BitConverter.ToUInt32( byte[ ], int )
method generates the following output. It converts elements
of a byte array to uint values.

initial byte array
------------------
0F-00-00-00-00-10-00-FF-03-00-00-CA-9A-3B-FF-FF-FF-FF-7F

index   array elements           uint
-----   --------------           ----
    1      00-00-00-00              0
    0      0F-00-00-00             15
    7      FF-03-00-00           1023
    3      00-00-10-00        1048576
   10      00-CA-9A-3B     1000000000
   15      FF-FF-FF-7F     2147483647
   14      FF-FF-FF-FF     4294967295
*/

Windows 98, Windows Server 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 Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0
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