如何在 C# 中使用 [DllImport("")]? [英] How to use [DllImport("")] in C#?

问题描述

我发现了很多关于它的问题，但没有人解释我如何使用它.

I found a lot of questions about it, but no one explains how I can use this.

我有这个:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using Microsoft.FSharp.Linq.RuntimeHelpers;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.IO;

public class WindowHandling
{
    public void ActivateTargetApplication(string processName, List<string> barcodesList)
    {
        [DllImport("User32.dll")]
        public static extern int SetForegroundWindow(IntPtr point);
        Process p = Process.Start("notepad++.exe");
        p.WaitForInputIdle();
        IntPtr h = p.MainWindowHandle;
        SetForegroundWindow(h);
        SendKeys.SendWait("k");
        IntPtr processFoundWindow = p.MainWindowHandle;
    }
}

谁能帮我理解为什么它在 DllImport 行和 public static 行上给我一个错误?

Can someone help me to understand why it gives me an error on the DllImport line and on the public static line?

有没有人有想法，我能做什么?谢谢.

Does anyone have an idea, what can I do? Thank you.

推荐答案

您不能在方法内声明 extern 本地方法，或任何其他具有属性的方法.将您的 DLL 导入移动到类中:

You can't declare an extern local method inside of a method, or any other method with an attribute. Move your DLL import into the class:

using System.Runtime.InteropServices;


public class WindowHandling
{
    [DllImport("User32.dll")]
    public static extern int SetForegroundWindow(IntPtr point);

    public void ActivateTargetApplication(string processName, List<string> barcodesList)
    {
        Process p = Process.Start("notepad++.exe");
        p.WaitForInputIdle();
        IntPtr h = p.MainWindowHandle;
        SetForegroundWindow(h);
        SendKeys.SendWait("k");
        IntPtr processFoundWindow = p.MainWindowHandle;
    }
}

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