C# 中 PInvoke 代码的使用

我有以下使用 DLLImport 的 C# 代码。

using System;

namespace LvFpga {
  class RegTest 
  {

    [DllImport("kernel32")]    
    public extern static int LoadLibrary(string lpLibFileName);
    [DllImport("kernel32")]    
    public extern static bool FreeLibrary(int hLibModule); 

    public static bool IsDllRegistered(string DllName)    
    {    
      int libId = LoadLibrary(DllName);
      if (libId>0) FreeLibrary(libId);
      return (libId>0);    
    }
    public static void Main(string[] args)
    {
        Console.WriteLn(IsDllRegistered("msdia100.dll"));
    }
  }
}

当我只是跑步时csc CSCODE.cs我得到了错误。

regtest.cs(7,6): error CS0246: The type or namespace name 'DllImport' could not be found (are you
        missing a using directive or an assembly reference?)
regtest.cs(7,6): error CS0246: The type or namespace name 'DllImportAttribute' could not be found
        (are you missing a using directive or an assembly reference?)
regtest.cs(9,6): error CS0246: The type or namespace name 'DllImport' could not be found (are you
        missing a using directive or an assembly reference?)
regtest.cs(9,6): error CS0246: The type or namespace name 'DllImportAttribute' could not be found
        (are you missing a using directive or an assembly reference?)

怎么了？选项中可以添加什么？

你必须有

using System.Runtime.InteropServices;

此外，没有函数“Console.WriteLn”。你需要

Console.WriteLine(IsDllRegistered("msdia100.dll"));