BitConverter.ToInt64 Method
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Returns a 64-bit signed integer converted from eight bytes at a specified position in a byte array.
Assembly: mscorlib (in mscorlib.dll)
'Declaration Public Shared Function ToInt64 ( _ value As Byte(), _ startIndex As Integer _ ) As Long
Parameters
- value
- Type:
System.Byte
()
An array of bytes.
- startIndex
- Type: System.Int32
The starting position within value.
Return Value
Type: System.Int64A 64-bit signed integer formed by eight bytes beginning at startIndex.
| 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 Nothing. |
| 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 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