如何从任意源拖放到我的WPF应用程序中？ [英] How do I drag-and-drop from an arbitrary source into my WPF application?

问题描述

我有一个包含迷你文件浏览器的WPF应用程序。我希望能够从各种来源（可能是资源管理器或电子邮件程序中的电子邮件附件）拖动文件，并将其放在我的文件浏览器控件上。文件的类型无关紧要，因为操作的语义总是相同的：将文件复制到我的迷你文件浏览器控件显示的当前目录中。



我该怎么做？我已经阅读了互联网上的大量内容，但它们都是从处理鼠标拖动开始拖拽开始的。我对此没有任何控制权，因为这发生在许多其他应用程序之一。



任何帮助将不胜感激。



我尝试了什么：



我试过设置 Drop =我的目标控件上的True并为 Drop 事件提供处理程序，但是当我拖动时，控件只显示一个无条目图标文件到它并且事件不会触发。

解决方案

你需要处理 DragDrop.DragOver附加事件 [ ^ ]并设置效果基于可用数据格式的 DragEventArgs 参数的属性为适当的值。

  private   void  control_DragOver（ object  sender，DragEventArgs e） 
 {
 e.Effects = DragDropEffects.None; 
 
  if （e.Data.GetDataPresent（DataFormats.FileDrop））
 {
 e.Effects = DragDropEffects。复制; 
} 
} 
 
  private   void  control_Drop（  object  sender，DragEventArgs e）
 {
  string  [] droppedFiles = e。 Data.GetData（DataFormats.FileDrop） as   string  []; 
  if （droppedFiles！=  null && droppedFiles.Length！=  0 ）
 {
 ... 
} 
} 

拖放概述 [ ^ ]



我没用过，但我刚刚找到这个WPF拖放库 [ ^ ]，看起来很有希望。

I have a WPF application that has a mini-file-explorer. I want to be able to drag files from various sources (maybe Explorer or maybe an email attachment in an email program) and drop them on my file-explorer control. The type of the file does not matter because the semantics of the operation are always the same: copy the file into the current directory being displayed by my mini-file-explorer control.

How do I do this? I have read loads of stuff on the internet, but they all begin with the handling of the mouse-drag that initiates the drag-and-drop. I don't have any control over this because this occurs in one of a number of other applications.

Any help would be greatly appreciated.

What I have tried:

I have tried setting Drop="True" on my target control and providing a handler for the Drop event, but the control simply displays a no-entry icon when I drag a file onto it and the event does not fire.

解决方案

You'll need to handle the DragDrop.DragOver attached event[^] and set the Effects property on the DragEventArgs parameter to an appropriate value based on the available data formats.

private void control_DragOver(object sender, DragEventArgs e)
{
    e.Effects = DragDropEffects.None;

    if (e.Data.GetDataPresent(DataFormats.FileDrop))
    {
        e.Effects = DragDropEffects.Copy;
    }
}

private void control_Drop(object sender, DragEventArgs e)
{
    string[] droppedFiles = e.Data.GetData(DataFormats.FileDrop) as string[];
    if (droppedFiles != null && droppedFiles.Length != 0)
    {
        ...
    }
}

Drag and Drop Overview[^]

I haven't used it, but I've just found this WPF drag/drop library[^], which looks promising.

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