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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 API is not CLS-compliant. 

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

[CLSCompliantAttribute(false)]
public static uint ToUInt32(
	byte[] value,
	int startIndex
)

Parameters

value
Type: System.Byte[]

An array of bytes.

startIndex
Type: System.Int32

The starting position within value.

Return Value

Type: System.UInt32
A 32-bit unsigned integer formed by four bytes beginning at startIndex.

ExceptionCondition
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 null.

ArgumentOutOfRangeException

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

The ToUInt32 method converts the bytes from index startIndex to startIndex + 3 to a UInt32 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 the BitConverter class topic.

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
*/

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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