如何在 C# 中使用 [DllImport("")]？
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How to use [DllImport("")] in C#?
提问by ThomasFey
I found a lot of questions about it, but no one explains how I can use this.
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 have 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;
}
}
Can someone help me to understand why it gives me an error on the DllImportline and on the public staticline?
有人可以帮我理解为什么它给我DllImport在线和在线的错误public static吗？
Does anyone have an idea, what can I do? Thank you.
有谁有想法，我能做什么？谢谢你。
采纳答案by vcsjones
You can't declare an externlocal method inside of a method, or any other method with an attribute. Move your DLL import into the class:
您不能extern在方法或任何其他具有属性的方法中声明本地方法。将您的 DLL 导入移动到类中：
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;
}
}
