BitConverter.ToInt64 Method
Important
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ToInt64(ReadOnlySpan<Byte>) |
Converts a read-only byte span into a 64-bit signed integer. |
ToInt64(Byte[], Int32) |
Returns a 64-bit signed integer converted from eight bytes at a specified position in a byte array. |
- Source:
- BitConverter.cs
- Source:
- BitConverter.cs
- Source:
- BitConverter.cs
Converts a read-only byte span into a 64-bit signed integer.
public:
static long ToInt64(ReadOnlySpan<System::Byte> value);
public static long ToInt64 (ReadOnlySpan<byte> value);
static member ToInt64 : ReadOnlySpan<byte> -> int64
Public Shared Function ToInt64 (value As ReadOnlySpan(Of Byte)) As Long
Parameters
- value
- ReadOnlySpan<Byte>
A read-only span containing the bytes to convert.
Returns
A 64-bit signed integer representing the converted bytes.
Exceptions
The length of value
is less than 8.
Applies to
.NET 9 和其他版本
产品 | 版本 |
---|---|
.NET | Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Standard | 2.1 |
- Source:
- BitConverter.cs
- Source:
- BitConverter.cs
- Source:
- BitConverter.cs
Returns a 64-bit signed integer converted from eight bytes at a specified position in a byte array.
public:
static long ToInt64(cli::array <System::Byte> ^ value, int startIndex);
public static long ToInt64 (byte[] value, int startIndex);
static member ToInt64 : byte[] * int -> int64
Public Shared Function ToInt64 (value As Byte(), startIndex As Integer) As Long
Parameters
- value
- Byte[]
An array of bytes that includes the eight bytes to convert.
- startIndex
- Int32
The starting position within value
.
Returns
A 64-bit signed integer formed by eight bytes beginning at startIndex
.
Exceptions
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.
value
is null
.
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.
using namespace System;
// Convert eight byte array elements to an __int64 and display it.
void BAToInt64( array<unsigned char>^bytes, int index )
{
__int64 value = BitConverter::ToInt64( bytes, index );
Console::WriteLine( "{0,5}{1,27}{2,24}", index, BitConverter::ToString( bytes, index, 8 ), value );
}
// Display a byte array, using multiple lines if necessary.
void WriteMultiLineByteArray( array<unsigned char>^bytes )
{
const int rowSize = 20;
int iter;
Console::WriteLine( "initial unsigned char array" );
Console::WriteLine( "---------------------------" );
for ( iter = 0; iter < bytes->Length - rowSize; iter += rowSize )
{
Console::Write( BitConverter::ToString( bytes, iter, rowSize ) );
Console::WriteLine( "-" );
}
Console::WriteLine( BitConverter::ToString( bytes, iter ) );
Console::WriteLine();
}
int main()
{
array<unsigned char>^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};
Console::WriteLine( "This example of the BitConverter::ToInt64( unsigned "
"char[ ], int ) \nmethod generates the following output. It "
"converts elements of a \nbyte array to __int64 values.\n" );
WriteMultiLineByteArray( byteArray );
Console::WriteLine( "{0,5}{1,27}{2,24}", "index", "array elements", "__int64" );
Console::WriteLine( "{0,5}{1,27}{2,24}", "-----", "--------------", "-------" );
// Convert byte array elements to __int64 values.
BAToInt64( byteArray, 8 );
BAToInt64( byteArray, 5 );
BAToInt64( byteArray, 34 );
BAToInt64( byteArray, 17 );
BAToInt64( byteArray, 0 );
BAToInt64( byteArray, 21 );
BAToInt64( byteArray, 26 );
BAToInt64( byteArray, 53 );
BAToInt64( byteArray, 45 );
BAToInt64( byteArray, 59 );
BAToInt64( byteArray, 67 );
BAToInt64( byteArray, 37 );
BAToInt64( byteArray, 9 );
}
/*
This example of the BitConverter::ToInt64( unsigned char[ ], int )
method generates the following output. It converts elements of a
byte array to __int64 values.
initial unsigned char 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 __int64
----- -------------- -------
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 BytesToInt64Demo
{
const string formatter = "{0,5}{1,27}{2,24}";
// Convert eight byte array elements to a long and display it.
public static void BAToInt64( byte[ ] bytes, int index )
{
long value = BitConverter.ToInt64( bytes, index );
Console.WriteLine( formatter, index,
BitConverter.ToString( bytes, index, 8 ), value );
}
// Display a byte array, using multiple lines if necessary.
public static void WriteMultiLineByteArray( byte[ ] bytes )
{
const int rowSize = 20;
int iter;
Console.WriteLine( "initial byte array" );
Console.WriteLine( "------------------" );
for( iter = 0; iter < bytes.Length - rowSize; iter += rowSize )
{
Console.Write(
BitConverter.ToString( bytes, iter, rowSize ) );
Console.WriteLine( "-" );
}
Console.WriteLine( BitConverter.ToString( bytes, iter ) );
Console.WriteLine( );
}
public static void Main( )
{
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 };
Console.WriteLine(
"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" );
WriteMultiLineByteArray( byteArray );
Console.WriteLine( formatter, "index", "array elements", "long" );
Console.WriteLine( formatter, "-----", "--------------", "----" );
// Convert byte array elements to long values.
BAToInt64( byteArray, 8 );
BAToInt64( byteArray, 5 );
BAToInt64( byteArray, 34 );
BAToInt64( byteArray, 17 );
BAToInt64( byteArray, 0 );
BAToInt64( byteArray, 21 );
BAToInt64( byteArray, 26 );
BAToInt64( byteArray, 53 );
BAToInt64( byteArray, 45 );
BAToInt64( byteArray, 59 );
BAToInt64( byteArray, 67 );
BAToInt64( byteArray, 37 );
BAToInt64( 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
*/
open System
let print obj1 obj2 obj3 = printfn $"{obj1,5}{obj2,27}{obj3,24}"
// Convert eight byte array elements to a long and display it.
let BAToInt64 bytes index =
let value = BitConverter.ToInt64(bytes, index)
print index (BitConverter.ToString(bytes, index, 8)) value
// Display a byte array, using multiple lines if necessary.
let writeMultiLineByteArray (bytes: byte []) =
let rowSize = 20
printfn "initial byte array"
printfn "------------------"
let mutable iter = 0
for i in 0 .. rowSize .. (bytes.Length - rowSize - 1) do
printfn $"{BitConverter.ToString(bytes, i, rowSize)}-"
iter <- i
printfn $"{BitConverter.ToString(bytes, iter + rowSize)}"
let byteArray =
[| 0uy; 54uy; 101uy; 196uy; 255uy; 255uy; 255uy; 255uy; 0uy; 0uy
0uy; 0uy; 0uy; 0uy; 0uy; 0uy; 128uy; 0uy; 202uy; 154uy
59uy; 0uy; 0uy; 0uy; 0uy; 1uy; 0uy; 0uy; 0uy; 0uy
255uy; 255uy; 255uy; 255uy; 1uy; 0uy; 0uy; 255uy; 255uy; 255uy
255uy; 255uy; 255uy; 255uy; 127uy; 86uy; 85uy; 85uy; 85uy; 85uy
85uy; 255uy; 255uy; 170uy; 170uy; 170uy; 170uy; 170uy; 170uy; 0uy
0uy; 100uy; 167uy; 179uy; 182uy; 224uy; 13uy; 0uy; 0uy; 156uy
88uy; 76uy; 73uy; 31uy; 242uy |]
printfn "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"
writeMultiLineByteArray byteArray
print "index" "array elements" "long"
print "-----" "--------------" "----"
// Convert byte array elements to long values.
BAToInt64 byteArray 8
BAToInt64 byteArray 5
BAToInt64 byteArray 34
BAToInt64 byteArray 17
BAToInt64 byteArray 0
BAToInt64 byteArray 21
BAToInt64 byteArray 26
BAToInt64 byteArray 53
BAToInt64 byteArray 45
BAToInt64 byteArray 59
BAToInt64 byteArray 67
BAToInt64 byteArray 37
BAToInt64 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
' Example of the BitConverter.ToInt64 method.
Module BytesToInt64Demo
Const formatter As String = "{0,5}{1,27}{2,24}"
' Convert eight Byte array elements to a Long and display it.
Sub BAToInt64( bytes( ) As Byte, index As Integer )
Dim value As Long = BitConverter.ToInt64( bytes, index )
Console.WriteLine( formatter, index, _
BitConverter.ToString( bytes, index, 8 ), value )
End Sub
' Display a Byte array, using multiple lines if necessary.
Sub WriteMultiLineByteArray( bytes( ) As Byte )
Const rowSize As Integer = 20
Dim iter As Integer
Console.WriteLine( "initial Byte array" )
Console.WriteLine( "------------------" )
For iter = 0 To bytes.Length - rowSize - 1 Step rowSize
Console.Write( _
BitConverter.ToString( bytes, iter, rowSize ) )
Console.WriteLine( "-" )
Next iter
Console.WriteLine( BitConverter.ToString( bytes, iter ) )
Console.WriteLine( )
End Sub
Sub Main( )
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 }
Console.WriteLine( _
"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 )
WriteMultiLineByteArray( byteArray )
Console.WriteLine( formatter, "index", "array elements", _
"Long" )
Console.WriteLine( formatter, "-----", "--------------", _
"----" )
' Convert Byte array elements to Long values.
BAToInt64( byteArray, 8 )
BAToInt64( byteArray, 5 )
BAToInt64( byteArray, 34 )
BAToInt64( byteArray, 17 )
BAToInt64( byteArray, 0 )
BAToInt64( byteArray, 21 )
BAToInt64( byteArray, 26 )
BAToInt64( byteArray, 53 )
BAToInt64( byteArray, 45 )
BAToInt64( byteArray, 59 )
BAToInt64( byteArray, 67 )
BAToInt64( byteArray, 37 )
BAToInt64( 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
Remarks
The ToInt64 method converts the bytes from index startIndex
to startIndex
+ 7 to a Int64 value. The order of bytes in the array must reflect the endianness of the computer system's architecture. For more information, see the Remarks section of the BitConverter class topic.
See also
Applies to
.NET 9 和其他版本
产品 | 版本 |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1 |
UWP | 10.0 |