拖放在 C# Winforms 应用程序中不起作用

问题描述

我正在尝试创建一个可以将文件/文件夹拖放到其上的 Windows 窗体.

I am trying to create a windows form onto which I can drop a file/folder.

我在 WinForms 应用程序中有以下代码

I have the following code in a WinForms app

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_DragEnter(object sender, DragEventArgs e)
    {
        Debug.Print("DragEnter");
    }

    private void Form1_DragDrop(object sender, DragEventArgs e)
    {
        MessageBox.Show("Dropped!");
    }
}

我已将 AllowDrop 属性设置为 true.我尝试在 Visual Studio 中调试运行应用程序.根据对其他类似问题的回答，我尝试以管理员身份运行编译后的 exe.我试过以管理员身份运行编译的 exe not.

I have set the AllowDrop property to true. I've tried running the application in debug within Visual Studio. Based on answers to other similar questions, I've tried running the compiled exe as administrator. I've tried running the compiled exe not as administrator.

但无论我做什么，我都无法触发 DragDrop 事件.但是，DragEnter 事件确实 会触发.我错过了什么?

But whatever I do, I cannot get the DragDrop event to fire. The DragEnter event does fire, however. What am I missing?

推荐答案

你的 DragDropEffect 设置合适吗?尝试将它放在 DragEnter 事件处理方法中:

Is your DragDropEffect set appropriately? Try placing this in the DragEnter Event Handler Method:

    private void Form1_DragEnter(object sender, DragEventArgs e)
    {
        Console.WriteLine("DragEnter!");
        e.Effect = DragDropEffects.Copy;
    }

默认情况下，它设置为 DragDropEffects.None，因此 Drop 事件不会触发.

By default it was set to DragDropEffects.None so the Drop event wouldn't fire.

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