BitConverter.ToUInt64 Method
Microsoft Silverlight will reach end of support after October 2021. Learn more.
Returns a 64-bit unsigned integer converted from eight bytes at a specified position in a byte array.
This API is not CLS-compliant.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
<CLSCompliantAttribute(False)> _
Public Shared Function ToUInt64 ( _
value As Byte(), _
startIndex As Integer _
) As ULong
[CLSCompliantAttribute(false)]
public static ulong ToUInt64(
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.UInt64
A 64-bit unsigned integer formed by the 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 UInt64 values with the ToUInt64 method.
' Example of the BitConverter.ToUInt64 method.
Module Example
Const formatter As String = "{0,5}{1,27}{2,24}"
' Convert eight Byte array elements to a UInt64 and display it.
Sub BAToUInt64(ByVal outputBlock As System.Windows.Controls.TextBlock, ByVal bytes() As Byte, ByVal index As Integer)
Dim value As UInt64 = BitConverter.ToUInt64(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() = { _
255, 255, 255, 0, 0, 0, 0, 0, 0, 0, _
0, 1, 0, 0, 0, 100, 167, 179, 182, 224, _
13, 0, 202, 154, 59, 0, 0, 0, 0, 170, _
170, 170, 170, 170, 170, 0, 0, 232, 137, 4, _
35, 199, 138, 255, 255, 255, 255, 255, 255, 255, _
255, 127}
outputBlock.Text &= String.Format( _
"This example of the BitConverter.ToUInt64( Byte( ), " & _
"Integer ) " & vbCrLf & "method generates the " & _
"following output. It converts elements " & vbCrLf & _
"of a Byte array to UInt64 values." & vbCrLf) & vbCrLf
WriteMultiLineByteArray(outputBlock, byteArray)
outputBlock.Text &= String.Format(formatter, "index", "array elements", _
"UInt64") & vbCrLf
outputBlock.Text &= String.Format(formatter, "-----", "--------------", _
"------") & vbCrLf
' Convert Byte array elements to UInt64 values.
BAToUInt64(outputBlock, byteArray, 3)
BAToUInt64(outputBlock, byteArray, 0)
BAToUInt64(outputBlock, byteArray, 21)
BAToUInt64(outputBlock, byteArray, 7)
BAToUInt64(outputBlock, byteArray, 29)
BAToUInt64(outputBlock, byteArray, 13)
BAToUInt64(outputBlock, byteArray, 35)
BAToUInt64(outputBlock, byteArray, 44)
BAToUInt64(outputBlock, byteArray, 43)
End Sub
End Module
' This example of the BitConverter.ToUInt64( Byte( ), Integer )
' method generates the following output. It converts elements
' of a Byte array to UInt64 values.
'
' initial Byte array
' ------------------
' FF-FF-FF-00-00-00-00-00-00-00-00-01-00-00-00-64-A7-B3-B6-E0-
' 0D-00-CA-9A-3B-00-00-00-00-AA-AA-AA-AA-AA-AA-00-00-E8-89-04-
' 23-C7-8A-FF-FF-FF-FF-FF-FF-FF-FF-7F
'
' index array elements UInt64
' ----- -------------- ------
' 3 00-00-00-00-00-00-00-00 0
' 0 FF-FF-FF-00-00-00-00-00 16777215
' 21 00-CA-9A-3B-00-00-00-00 1000000000
' 7 00-00-00-00-01-00-00-00 4294967296
' 29 AA-AA-AA-AA-AA-AA-00-00 187649984473770
' 13 00-00-64-A7-B3-B6-E0-0D 1000000000000000000
' 35 00-00-E8-89-04-23-C7-8A 10000000000000000000
' 44 FF-FF-FF-FF-FF-FF-FF-7F 9223372036854775807
' 43 FF-FF-FF-FF-FF-FF-FF-FF 18446744073709551615
// Example of the BitConverter.ToUInt64 method.
using System;
class Example
{
const string formatter = "{0,5}{1,27}{2,24}";
// Convert eight byte array elements to a ulong and display it.
public static void BAToUInt64(System.Windows.Controls.TextBlock outputBlock, byte[] bytes, int index)
{
ulong value = BitConverter.ToUInt64(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 = {
255, 255, 255, 0, 0, 0, 0, 0, 0, 0,
0, 1, 0, 0, 0, 100, 167, 179, 182, 224,
13, 0, 202, 154, 59, 0, 0, 0, 0, 170,
170, 170, 170, 170, 170, 0, 0, 232, 137, 4,
35, 199, 138, 255, 255, 255, 255, 255, 255, 255,
255, 127 };
outputBlock.Text += String.Format(
"This example of the BitConverter.ToUInt64( byte[ ], " +
"int ) \nmethod generates the following output. It " +
"converts elements \nof a byte array to ulong values.\n") + "\n";
WriteMultiLineByteArray(outputBlock, byteArray);
outputBlock.Text += String.Format(formatter, "index", "array elements",
"ulong") + "\n";
outputBlock.Text += String.Format(formatter, "-----", "--------------",
"------") + "\n";
// Convert byte array elements to ulong values.
BAToUInt64(outputBlock, byteArray, 3);
BAToUInt64(outputBlock, byteArray, 0);
BAToUInt64(outputBlock, byteArray, 21);
BAToUInt64(outputBlock, byteArray, 7);
BAToUInt64(outputBlock, byteArray, 29);
BAToUInt64(outputBlock, byteArray, 13);
BAToUInt64(outputBlock, byteArray, 35);
BAToUInt64(outputBlock, byteArray, 44);
BAToUInt64(outputBlock, byteArray, 43);
}
}
/*
This example of the BitConverter.ToUInt64( byte[ ], int )
method generates the following output. It converts elements
of a byte array to ulong values.
initial byte array
------------------
FF-FF-FF-00-00-00-00-00-00-00-00-01-00-00-00-64-A7-B3-B6-E0-
0D-00-CA-9A-3B-00-00-00-00-AA-AA-AA-AA-AA-AA-00-00-E8-89-04-
23-C7-8A-FF-FF-FF-FF-FF-FF-FF-FF-7F
index array elements ulong
----- -------------- ------
3 00-00-00-00-00-00-00-00 0
0 FF-FF-FF-00-00-00-00-00 16777215
21 00-CA-9A-3B-00-00-00-00 1000000000
7 00-00-00-00-01-00-00-00 4294967296
29 AA-AA-AA-AA-AA-AA-00-00 187649984473770
13 00-00-64-A7-B3-B6-E0-0D 1000000000000000000
35 00-00-E8-89-04-23-C7-8A 10000000000000000000
44 FF-FF-FF-FF-FF-FF-FF-7F 9223372036854775807
43 FF-FF-FF-FF-FF-FF-FF-FF 18446744073709551615
*/
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.