Export (0) Print
Expand All

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)

[SecuritySafeCriticalAttribute]
public static int ToInt32(
	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.Int32
A 32-bit signed 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 following code example converts elements of Byte arrays to Int32 values with the ToInt32 method.


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

class Example
{
   const string formatter = "{0,5}{1,17}{2,15}";

   // Convert four byte array elements to an int and display it.
   public static void BAToInt32(System.Windows.Controls.TextBlock outputBlock, byte[] bytes, int index)
   {
      int value = BitConverter.ToInt32(bytes, index);

      outputBlock.Text += String.Format(formatter, index,
          BitConverter.ToString(bytes, index, 4), value) + "\n";
   }

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

      outputBlock.Text += "initial byte array" + "\n";
      outputBlock.Text += "------------------" + "\n";

      for (iter = 0; iter < bytes.Length - rowSize; iter += rowSize)
      {
         outputBlock.Text += String.Format(
             BitConverter.ToString(bytes, iter, rowSize));
         outputBlock.Text += "-" + "\n";
      }

      outputBlock.Text += String.Format(BitConverter.ToString(bytes, iter)) + "\n";
      outputBlock.Text += "\n";
   }

   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      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 };

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

      WriteMultiLineByteArray(outputBlock, byteArray);

      outputBlock.Text += String.Format(formatter, "index", "array elements",
          "int") + "\n";
      outputBlock.Text += String.Format(formatter, "-----", "--------------",
          "---") + "\n";

      // Convert byte array elements to int values.
      BAToInt32(outputBlock, byteArray, 1);
      BAToInt32(outputBlock, byteArray, 0);
      BAToInt32(outputBlock, byteArray, 21);
      BAToInt32(outputBlock, byteArray, 6);
      BAToInt32(outputBlock, byteArray, 9);
      BAToInt32(outputBlock, byteArray, 13);
      BAToInt32(outputBlock, byteArray, 17);
      BAToInt32(outputBlock, byteArray, 22);
      BAToInt32(outputBlock, 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
*/


Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Community Additions

ADD
Show:
© 2014 Microsoft