BitConverter.ToInt64 Method
Microsoft Silverlight will reach end of support after October 2021. Learn more.
Returns a 64-bit signed integer converted from eight bytes at a specified position in a byte array.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
<SecuritySafeCriticalAttribute> _
Public Shared Function ToInt64 ( _
value As Byte(), _
startIndex As Integer _
) As Long
[SecuritySafeCriticalAttribute]
public static long ToInt64(
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.Int64
A 64-bit signed integer formed by eight bytes beginning at startIndex.
Exceptions
| Exception | Condition |
|---|---|
| ArgumentException | startIndex is greater than or equal to the length of value minus 7, 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 Int64 values with the ToInt64 method.
' Example of the BitConverter.ToInt64 method.
Module Example
Const formatter As String = "{0,5}{1,27}{2,24}"
' Convert eight Byte array elements to a Long and display it.
Sub BAToInt64(ByVal outputBlock As System.Windows.Controls.TextBlock, ByVal bytes() As Byte, ByVal index As Integer)
Dim value As Long = BitConverter.ToInt64(bytes, index)
outputBlock.Text &= String.Format(formatter, index, _
BitConverter.ToString(bytes, index, 8), 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() = { _
0, 54, 101, 196, 255, 255, 255, 255, 0, 0, _
0, 0, 0, 0, 0, 0, 128, 0, 202, 154, _
59, 0, 0, 0, 0, 1, 0, 0, 0, 0, _
255, 255, 255, 255, 1, 0, 0, 255, 255, 255, _
255, 255, 255, 255, 127, 86, 85, 85, 85, 85, _
85, 255, 255, 170, 170, 170, 170, 170, 170, 0, _
0, 100, 167, 179, 182, 224, 13, 0, 0, 156, _
88, 76, 73, 31, 242}
outputBlock.Text &= String.Format( _
"This example of the BitConverter.ToInt64( Byte( ), " & _
"Integer ) " & vbCrLf & "method generates the " & _
"following output. It converts elements " & vbCrLf & _
"of a Byte array to Long values." & vbCrLf) & vbCrLf
WriteMultiLineByteArray(outputBlock, byteArray)
outputBlock.Text &= String.Format(formatter, "index", "array elements", _
"Long") & vbCrLf
outputBlock.Text &= String.Format(formatter, "-----", "--------------", _
"----") & vbCrLf
' Convert Byte array elements to Long values.
BAToInt64(outputBlock, byteArray, 8)
BAToInt64(outputBlock, byteArray, 5)
BAToInt64(outputBlock, byteArray, 34)
BAToInt64(outputBlock, byteArray, 17)
BAToInt64(outputBlock, byteArray, 0)
BAToInt64(outputBlock, byteArray, 21)
BAToInt64(outputBlock, byteArray, 26)
BAToInt64(outputBlock, byteArray, 53)
BAToInt64(outputBlock, byteArray, 45)
BAToInt64(outputBlock, byteArray, 59)
BAToInt64(outputBlock, byteArray, 67)
BAToInt64(outputBlock, byteArray, 37)
BAToInt64(outputBlock, byteArray, 9)
End Sub
End Module
' This example of the BitConverter.ToInt64( Byte( ), Integer )
' method generates the following output. It converts elements
' of a Byte array to Long values.
'
' initial Byte array
' ------------------
' 00-36-65-C4-FF-FF-FF-FF-00-00-00-00-00-00-00-00-80-00-CA-9A-
' 3B-00-00-00-00-01-00-00-00-00-FF-FF-FF-FF-01-00-00-FF-FF-FF-
' FF-FF-FF-FF-7F-56-55-55-55-55-55-FF-FF-AA-AA-AA-AA-AA-AA-00-
' 00-64-A7-B3-B6-E0-0D-00-00-9C-58-4C-49-1F-F2
'
' index array elements Long
' ----- -------------- ----
' 8 00-00-00-00-00-00-00-00 0
' 5 FF-FF-FF-00-00-00-00-00 16777215
' 34 01-00-00-FF-FF-FF-FF-FF -16777215
' 17 00-CA-9A-3B-00-00-00-00 1000000000
' 0 00-36-65-C4-FF-FF-FF-FF -1000000000
' 21 00-00-00-00-01-00-00-00 4294967296
' 26 00-00-00-00-FF-FF-FF-FF -4294967296
' 53 AA-AA-AA-AA-AA-AA-00-00 187649984473770
' 45 56-55-55-55-55-55-FF-FF -187649984473770
' 59 00-00-64-A7-B3-B6-E0-0D 1000000000000000000
' 67 00-00-9C-58-4C-49-1F-F2 -1000000000000000000
' 37 FF-FF-FF-FF-FF-FF-FF-7F 9223372036854775807
' 9 00-00-00-00-00-00-00-80 -9223372036854775808
// Example of the BitConverter.ToInt64 method.
using System;
class Example
{
const string formatter = "{0,5}{1,27}{2,24}";
// Convert eight byte array elements to a long and display it.
public static void BAToInt64(System.Windows.Controls.TextBlock outputBlock, byte[] bytes, int index)
{
long value = BitConverter.ToInt64(bytes, index);
outputBlock.Text += String.Format(formatter, index,
BitConverter.ToString(bytes, index, 8), 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 = {
0, 54, 101, 196, 255, 255, 255, 255, 0, 0,
0, 0, 0, 0, 0, 0, 128, 0, 202, 154,
59, 0, 0, 0, 0, 1, 0, 0, 0, 0,
255, 255, 255, 255, 1, 0, 0, 255, 255, 255,
255, 255, 255, 255, 127, 86, 85, 85, 85, 85,
85, 255, 255, 170, 170, 170, 170, 170, 170, 0,
0, 100, 167, 179, 182, 224, 13, 0, 0, 156,
88, 76, 73, 31, 242 };
outputBlock.Text += String.Format(
"This example of the BitConverter.ToInt64( byte[ ], " +
"int ) \nmethod generates the following output. It " +
"converts elements \nof a byte array to long values.\r\n") + "\n";
WriteMultiLineByteArray(outputBlock, byteArray);
outputBlock.Text += String.Format(formatter, "index", "array elements", "long") + "\n";
outputBlock.Text += String.Format(formatter, "-----", "--------------", "----") + "\n";
// Convert byte array elements to long values.
BAToInt64(outputBlock, byteArray, 8);
BAToInt64(outputBlock, byteArray, 5);
BAToInt64(outputBlock, byteArray, 34);
BAToInt64(outputBlock, byteArray, 17);
BAToInt64(outputBlock, byteArray, 0);
BAToInt64(outputBlock, byteArray, 21);
BAToInt64(outputBlock, byteArray, 26);
BAToInt64(outputBlock, byteArray, 53);
BAToInt64(outputBlock, byteArray, 45);
BAToInt64(outputBlock, byteArray, 59);
BAToInt64(outputBlock, byteArray, 67);
BAToInt64(outputBlock, byteArray, 37);
BAToInt64(outputBlock, byteArray, 9);
}
}
/*
This example of the BitConverter.ToInt64( byte[ ], int )
method generates the following output. It converts elements
of a byte array to long values.
initial byte array
------------------
00-36-65-C4-FF-FF-FF-FF-00-00-00-00-00-00-00-00-80-00-CA-9A-
3B-00-00-00-00-01-00-00-00-00-FF-FF-FF-FF-01-00-00-FF-FF-FF-
FF-FF-FF-FF-7F-56-55-55-55-55-55-FF-FF-AA-AA-AA-AA-AA-AA-00-
00-64-A7-B3-B6-E0-0D-00-00-9C-58-4C-49-1F-F2
index array elements long
----- -------------- ----
8 00-00-00-00-00-00-00-00 0
5 FF-FF-FF-00-00-00-00-00 16777215
34 01-00-00-FF-FF-FF-FF-FF -16777215
17 00-CA-9A-3B-00-00-00-00 1000000000
0 00-36-65-C4-FF-FF-FF-FF -1000000000
21 00-00-00-00-01-00-00-00 4294967296
26 00-00-00-00-FF-FF-FF-FF -4294967296
53 AA-AA-AA-AA-AA-AA-00-00 187649984473770
45 56-55-55-55-55-55-FF-FF -187649984473770
59 00-00-64-A7-B3-B6-E0-0D 1000000000000000000
67 00-00-9C-58-4C-49-1F-F2 -1000000000000000000
37 FF-FF-FF-FF-FF-FF-FF-7F 9223372036854775807
9 00-00-00-00-00-00-00-80 -9223372036854775808
*/
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.