获得拖累的优势

I have an WPF-Datagrid where I can drop an element. This is a Textelement dropped from an .txt file (open for example with notepad++). Is there any possibility to get information about the .txt file on my Drop-Event ?

我有一个WPF-Datagrid,我可以删除一个元素。这是从.txt文件中删除的Textelement(例如用notepad ++打开)。有没有可能在我的Drop-Event上获取有关.txt文件的信息?

Edit:

void OnDragDrop(object sender, DragEventArgs e)
{
    String text = e.Data.GetData(DataFormats.Text, true);
}

Here I can get the Text of my drop element, but I found no solution to get the source file, where the drag get started.

在这里,我可以获取我的drop元素的Text,但是我找不到获取源文件的解决方案,拖动开始的位置。

2 个解决方案

#1

ok here you go:

好的,你去吧:

You have to do three things to enable drag'n drop in WPF:

你必须做三件事才能在WPF中实现拖放:

Tell the element to support drag'n drop

告诉元素支持拖放

Setup a DragOver Event

设置DragOver事件

Setup a Drop Event

设置丢弃事件

ok, let's first look at the XAML:

好的,我们先来看看XAML:

<DataGrid AllowDrop="True"
            DragOver="DataGrid_DragOver"
            Drop="DataGrid_Drop"/>

And the event handler code:

和事件处理程序代码:

private void DataGrid_DragOver(object sender, DragEventArgs e)
{
    // check if the element dragged over is one or more files
    if (e.Data.GetDataPresent(DataFormats.FileDrop))
    {
        // if so, show a link cursor
        e.Effects = DragDropEffects.Link;
    }
    else
    {
        // otherwise show a "block" cursor
        e.Effects = DragDropEffects.None;
    }

    // IMPORTANT: mark the event as "handled by us", to apply the drag effects
    e.Handled = true;
}

private void DataGrid_Drop(object sender, DragEventArgs e)
{
    // Check if the data dropped is one or more files
    if (e.Data.GetDataPresent(DataFormats.FileDrop))
    {
        // get the file pathes from the data object
        string[] filePaths = (e.Data.GetData(DataFormats.FileDrop) as string[]); 

        // do something with the pathes
        /* ... */
    }
}

For more information see the MSDN documentation.

有关更多信息,请参阅MSDN文档。

#2

No.

Think of Drag & Drop the same way as Cut & Paste -- typically only the "data" is being dragged over during the event, and no additional metadata about its source.

可以想象拖放与剪切和粘贴相同 - 通常只在事件期间拖动“数据”,并且没有关于其源的其他元数据。

One exception to this, is when dragging text from a web page. DataFormats.Html will include the SourceURL that the text came from.

一个例外是从网页拖动文本时。 DataFormats.Html将包含文本来自的SourceURL。

#1