語言

IntPtr.Add(IntPtr, Int32) 方法

定義

命名空間:
System
組件:
mscorlib.dll, System.Runtime.dll
組件:
netstandard.dll, System.Runtime.dll
組件:
System.Runtime.dll
組件:
mscorlib.dll
組件:
netstandard.dll
來源:
IntPtr.cs
來源:
IntPtr.cs
來源:
IntPtr.cs
來源:
IntPtr.cs
來源:
IntPtr.cs

將位移加入帶正負號的整數。

public:
 static IntPtr Add(IntPtr pointer, int offset);
public static IntPtr Add(IntPtr pointer, int offset);
static member Add : nativeint * int -> nativeint
Public Shared Function Add (pointer As IntPtr, offset As Integer) As IntPtr

參數

pointer
IntPtr

nativeint

將偏移量加到帶符號整數上。

offset
Int32

要加上偏移。

傳回

IntPtr

nativeint

一個新的帶號整數，反映將 加入 offset 。pointer

範例

以下範例實例化一個 IntPtr 指向十元素陣列起始的物件，然後呼叫 Add 該方法來遍歷陣列中的元素。

using System;
using System.Runtime.InteropServices;

public class Example
{
   public static void Main()
   {
      int[] arr = { 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 };
      unsafe {
         fixed(int* parr = arr) {
            IntPtr ptr = new IntPtr(parr);
            // Get the size of an array element.
            int size = sizeof(int);
            for (int ctr = 0; ctr < arr.Length; ctr++)
            {
               IntPtr newPtr = IntPtr.Add(ptr, ctr * size);
               Console.Write("{0}   ", Marshal.ReadInt32(newPtr));
            }
         }
      }
   }
}
// The example displays the following output:
//       2   4   6   8   10   12   14   16   18   20

#nowarn "9"
open System
open System.Runtime.InteropServices
open FSharp.NativeInterop

[<EntryPoint>]
let main _ =
    let mutable arr = 
        [| 2; 4; 6; 8; 10; 12; 14; 16; 18; 20 |]
    
    use parr = fixed arr
    
    let ptr = NativePtr.toNativeInt parr

    // Get the size of an array element.
    let size = sizeof<int>
    for i = 0 to arr.Length - 1 do
        let newPtr = IntPtr.Add(ptr, i * size)
        printf $"{Marshal.ReadInt32 newPtr}   "
    0

// The example displays the following output:
//       2   4   6   8   10   12   14   16   18   20

Imports System.Runtime.InteropServices

Module Example
   Public Sub Main()
      Dim arr() As Integer = { 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 }
      Dim ptr As IntPtr = Marshal.UnsafeAddrOfPinnedArrayElement(arr, 0)

      For ctr As Integer= 0 To arr.Length - 1
         Dim newPtr As IntPtr = IntPtr.Add(ptr, ctr * Len(arr(0)))
         Console.Write("{0}   ", Marshal.ReadInt32(newPtr))
      Next
   End Sub
End Module
' The example displays the following output:
'       2   4   6   8   10   12   14   16   18   20

備註

若結果過大無法在執行過程中以有符號整數表示，該 Add 方法不會拋出例外。 相反地，加法運算是在未檢查的上下文中執行的。

不支援運算子重載或自訂運算子的語言，可以使用此方法為指標值增加偏移量。

適用於

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