BitConverter.ToInt32 Method
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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)
Syntax
'Declaration
<SecuritySafeCriticalAttribute> _
Public Shared Function ToInt32 ( _
value As Byte(), _
startIndex As Integer _
) As Integer
[SecuritySafeCriticalAttribute]
public static int ToInt32(
byte[] value,
int startIndex
)
Parameters
- value
Type: array<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.
Exceptions
| Exception | Condition |
|---|---|
| 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 nulla null reference (Nothing in Visual Basic). |
| ArgumentOutOfRangeException | startIndex is less than zero or greater than the length of value minus 1. |
Examples
The following code example converts elements of Byte arrays to Int32 values with the ToInt32 method.
' Example of the BitConverter.ToInt32 method.
Module Example
Const formatter As String = "{0,5}{1,17}{2,15}"
' Convert four Byte array elements to an Integer and display it.
Sub BAToInt32(ByVal outputBlock As System.Windows.Controls.TextBlock, ByVal bytes() As Byte, ByVal index As Integer)
Dim value As Integer = BitConverter.ToInt32(bytes, index)
outputBlock.Text &= String.Format(formatter, index, _
BitConverter.ToString(bytes, index, 4), value) & vbCrLf
End Sub
' Display a Byte array, using multiple lines if necessary.
Sub WriteMultiLineByteArray(ByVal outputBlock As System.Windows.Controls.TextBlock, ByVal bytes() As Byte)
Const rowSize As Integer = 20
Dim iter As Integer
outputBlock.Text &= "initial Byte array" & vbCrLf
outputBlock.Text &= "------------------" & vbCrLf
For iter = 0 To bytes.Length - rowSize - 1 Step rowSize
outputBlock.Text &= String.Format( _
BitConverter.ToString(bytes, iter, rowSize))
outputBlock.Text &= "-" & vbCrLf
Next iter
outputBlock.Text &= String.Format(BitConverter.ToString(bytes, iter)) & vbCrLf
outputBlock.Text &= vbCrLf
End Sub
Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
Dim byteArray As Byte() = { _
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( ), " & _
"Integer ) " & vbCrLf & "method generates the " & _
"following output. It converts elements " & vbCrLf & _
"of a Byte array to Integer values." & vbCrLf) & vbCrLf
WriteMultiLineByteArray(outputBlock, byteArray)
outputBlock.Text &= String.Format(formatter, "index", "array elements", _
"Integer") & vbCrLf
outputBlock.Text &= String.Format(formatter, "-----", "--------------", _
"-------") & vbCrLf
' Convert Byte array elements to Integer 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)
End Sub
End Module
' This example of the BitConverter.ToInt32( Byte( ), Integer )
' method generates the following output. It converts elements
' of a Byte array to Integer 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 Integer
' ----- -------------- -------
' 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.
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
*/
Version Information
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
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.