public:
static int ToInt32(ReadOnlySpan<System::Byte> value);
public static int ToInt32 (ReadOnlySpan<byte> value);
static member ToInt32 : ReadOnlySpan<byte> -> int
Public Shared Function ToInt32 (value As ReadOnlySpan(Of Byte)) As Integer
public:
static int ToInt32(cli::array <System::Byte> ^ value, int startIndex);
public static int ToInt32 (byte[] value, int startIndex);
static member ToInt32 : byte[] * int -> int
Public Shared Function ToInt32 (value As Byte(), startIndex As Integer) As Integer
以下示例使用
ToInt32
方法从四字节数组和八字节数组的上四个字节创建
Int32
值。 它还使用
GetBytes(Int32)
和
ToInt32
方法来往返
Int32
值。
using System;
public class Example
public static void Main()
// Create an Integer from a 4-byte array.
Byte[] bytes1 = { 0xEC, 0x00, 0x00, 0x00 };
Console.WriteLine("{0}--> 0x{1:X4} ({1:N0})", FormatBytes(bytes1),
BitConverter.ToInt32(bytes1, 0));
// Create an Integer from the upper four bytes of a byte array.
Byte[] bytes2 = BitConverter.GetBytes(Int64.MaxValue / 2);
Console.WriteLine("{0}--> 0x{1:X4} ({1:N0})", FormatBytes(bytes2),
BitConverter.ToInt32(bytes2, 4));
// Round-trip an integer value.
int original = (int) Math.Pow(16, 3);
Byte[] bytes3 = BitConverter.GetBytes(original);
int restored = BitConverter.ToInt32(bytes3, 0);
Console.WriteLine("0x{0:X4} ({0:N0}) --> {1} --> 0x{2:X4} ({2:N0})", original,
FormatBytes(bytes3), restored);
private static string FormatBytes(Byte[] bytes)
string value = "";
foreach (var byt in bytes)
value += string.Format("{0:X2} ", byt);
return value;
// The example displays the following output:
// EC 00 00 00 --> 0x00EC (236)
// FF FF FF FF FF FF FF 3F --> 0x3FFFFFFF (1,073,741,823)
// 0x1000 (4,096) --> 00 10 00 00 --> 0x1000 (4,096)
open System
let formatBytes (bytes: byte []) =
bytes
|> Array.map (fun x -> $"{x:X2}")
|> String.concat ""
// Create an Integer from a 4-byte array.
let bytes1 = [| 0xECuy; 0x00uy; 0x00uy; 0x00uy |]
let int1 = BitConverter.ToInt32(bytes1, 0)
printfn $"{formatBytes bytes1}--> 0x{int1:X4} ({int1:N0})"
// Create an Integer from the upper four bytes of a byte array.
let bytes2 = BitConverter.GetBytes(Int64.MaxValue / 2L)
let int2 = BitConverter.ToInt32(bytes2, 4)
printfn $"{formatBytes bytes2}--> 0x{int2:X4} ({int2:N0})"
// Round-trip an integer value.
let original = pown 16 3
let bytes3 = BitConverter.GetBytes original
let restored = BitConverter.ToInt32(bytes3, 0)
printfn $"0x{original:X4} ({original:N0}) --> {formatBytes bytes3} --> 0x{restored:X4} ({restored:N0})"
// The example displays the following output:
// EC 00 00 00 --> 0x00EC (236)
// FF FF FF FF FF FF FF 3F --> 0x3FFFFFFF (1,073,741,823)
// 0x1000 (4,096) --> 00 10 00 00 --> 0x1000 (4,096)
Module Example
Public Sub Main()
' Create an Integer from a 4-byte array.
Dim bytes1() As Byte = { &hEC, &h00, &h00, &h00 }
Console.WriteLine("{0}--> 0x{1:X4} ({1:N0})", FormatBytes(bytes1),
BitConverter.ToInt32(bytes1, 0))
' Create an Integer from the upper four bytes of a byte array.
Dim bytes2() As Byte = BitConverter.GetBytes(Int64.MaxValue \ 2)
Console.WriteLine("{0}--> 0x{1:X4} ({1:N0})", FormatBytes(bytes2),
BitConverter.ToInt32(bytes2, 4))
' Round-trip an integer value.
Dim original As Integer = CInt(16^3)
Dim bytes3() As Byte = BitConverter.GetBytes(original)
Dim restored As Integer = BitConverter.ToInt32(bytes3, 0)
Console.WriteLine("0x{0:X4} ({0:N0}) --> {1} --> 0x{2:X4} ({2:N0})", original,
FormatBytes(bytes3), restored)
End Sub
Private Function FormatBytes(bytes() As Byte) As String
Dim value As String = ""
For Each byt In bytes
value += String.Format("{0:X2} ", byt)
Return value
End Function
End Module
' The example displays the following output:
' EC 00 00 00 --> 0x00EC (236)
' FF FF FF FF FF FF FF 3F --> 0x3FFFFFFF (1,073,741,823)
' 0x1000 (4,096) --> 00 10 00 00 --> 0x1000 (4,096)
方法
ToInt32
将字节从索引
startIndex
转换为
startIndex
+ 3 的值
Int32
。 数组中的字节顺序必须反映计算机系统体系结构的字节顺序。 有关详细信息，请参阅 的
BitConverter
“备注”部分。
