[DllImport("user32.dll"))是什么意思? [英] what is meant by [DllImport("user32.dll") ?

问题描述

大家好

我到处搜索，但没有找到[DllImport("user32.dll")]的使用，也不知道如何使用，在哪里使用?

我看到很多具有此属性的代码.我是c#编程的初学者，所以请帮助

hello all

I searched everywhere but i didnt find the use of [DllImport("user32.dll")] and i dont know how to use , where to use ?

i saw lots of codes having this attribute . I am a beginner in programming c# , so please help

推荐答案

这意味着在它下面声明的方法不在.NET中-处于外部(本机) DLL文件.
在这种情况下，它位于User32.dll文件中，该文件是标准Windows组件.

例如:

It means that the method declared below it is not in .NET - it is in a external (native) DLL file.
In this case, it is in the User32.dll file, which is a standard Windows component.

For example:

[DllImport("User32")]
private static extern int SetForegroundWindow(IntPtr hwnd);

SetForegroundWindow方法是Windows的标准功能，上面的声明使我们能够像使用.NET方法一样使用它:

The method SetForegroundWindow is a standard Windows function, and teh above declaration allows us to us it as if it was a .NET method:

public static void SingleInstance(this Process thisProcess)
    {
    foreach (Process proc in Process.GetProcessesByName(thisProcess.ProcessName))
        {
        if (proc.Id != thisProcess.Id)
            {
            ShowWindow(proc.MainWindowHandle, SW_RESTORE);
            SetForegroundWindow(proc.MainWindowHandle);
            thisProcess.Kill();
            }
        }
    }

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