在C#中导入DLL [英] Importing a DLL in C#
问题描述
我正尝试使用DllImport将dll导入我的C#项目中,如下所示:
I'm trying to import a dll to my C# project using DllImport as follows:
[DllImport("kernel32")]
private static extern long WritePrivateProfileString(string section, string key,string val,string filePath);
此外,我添加了名称空间System.Runtime.InteropServices:
Also, I have added the namespace System.Runtime.InteropServices:
using System.Runtime.InteropServices;
不过,我遇到了一个错误:
名称 DllImport没有存在于当前上下文中。
Still, I'm getting an error: "The name 'DllImport' does not exist in the current context"
在类中可以导入dll的位置是否受到限制?
Is there a limitation on where in a class you can import a dll?
推荐答案
您的语句中可能还返回了错误的返回类型。尝试使用 bool :
You've probably also got the wrong return type in your statement. Try with bool:
[DllImport("kernel32")]
private static extern bool WritePrivateProfileString(string section, string key,string val,string filePath);
参考文献: http://msdn.microsoft.com/zh-cn/library/ms725501(v = vs.85).aspx
编辑:
DllImport必须放置在类的主体内。不在方法或构造函数内部。
DllImports have to be placed inside the body of your class. Not inside methods or the constructor.
public class Class1
{
//DllImport goes here:
[DllImport("kernel32")]
private static extern ...
public Class1()
{
...
}
/* snip */
}
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