怎么做拖放 [英] How to do drag drop

问题描述

How to do drag drop from one windows form to another windows form ?

我尝试过：



我试图使用这里的例子

https://msdn.microsoft.com/en-us/library/system.windows.forms.control.dodragdrop(v=vs .110）.aspx



但我想要的是数据是从另一个窗口形式拖动到另一个窗口形式。

What I have tried:

I have tried to used the example like here
https://msdn.microsoft.com/en-us/library/system.windows.forms.control.dodragdrop(v=vs.110).aspx

but what I want is the data is drag from another window form to another window form.

推荐答案

这取决于你拖动的内容，但是......

这是一个两阶段的过程：你需要在目标表单中启用drop（这使用文件）

1）将表单的AllowDrop属性设置为True

2）为表单的DragEnter和DragDrop事件创建一个处理程序。

3）在DragEnter处理程序，添加以下代码行：

It depends what you are dragging, but...
It's a two stage process: you need to enable drop in the destination form (this uses files)
1) Set the AllowDrop property of your form to True
2) Create a handler for both the DragEnter and DragDrop events of your form.
3) In the DragEnter handler, add the following line of code:

e.Effect = DragDropEffects.Move;

4）在DragDrop处理程序中，添加以下内容：

4) In the DragDrop handler, add the following:

string[] files = (string[]) e.Data.GetData(DataFormats.FileDrop);
if (files != null)
    {
    foreach (string file in files)
        {
        Console.WriteLine(file); // Or whatever you need to do...
        }
    }

在源表格中，它有点复杂，因为您需要使用支持拖动的控件，例如ListView。

1）处理控件ItemDrag事件。在这种情况下，ListView：

In your source form, it's a little more complex, as you need to use a control that supports dragging, such as the ListView.
1) Handle the controls ItemDrag event. In this case, a ListView:

private void myListView_ItemDrag(object sender, ItemDragEventArgs e)
    {
    StringCollection s = new StringCollection();
    s.Add(@"D:\Test Data\MyPic.jpg");
    DataObject obj = new DataObject();
    obj.SetFileDropList(s);
    myListView.DoDragDrop(obj, DragDropEffects.Copy);
    }

2）就是这样！

2) That's it!

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