WPF FileDrop事件:只允许特定的文件扩展名 [英] WPF FileDrop Event: just allow a specific file extension
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问题描述
我有一个WPF控件,我想从我的桌面删除特定文件,该控件。这是不是一个沉重的一部分,但我想检查的文件扩展名来允许或禁止的下降。什么是解决这个问题的最好办法。
I have a WPF Control and I want to drop a specific file from my desktop to this control. This is not a heavy part but I would like to check the file extension to allow or disallow the dropping. What is the best way to solve this problem?
推荐答案
我觉得这应该工作:
<Grid>
<ListBox AllowDrop="True" DragOver="lbx1_DragOver"
Drop="lbx1_Drop"></ListBox>
</Grid>
让我们假设你想只允许C#文件:
Let's assume you want to allow only C# files:
private void lbx1_DragOver(object sender, DragEventArgs e)
{
bool dropEnabled = true;
if (e.Data.GetDataPresent(DataFormats.FileDrop, true))
{
string[] filenames =
e.Data.GetData(DataFormats.FileDrop, true) as string[];
foreach (string filename in filenames)
{
if(System.IO.Path.GetExtension(filename).ToUpperInvariant() != ".CS")
{
dropEnabled = false;
break;
}
}
}
else
{
dropEnabled = false;
}
if (!dropEnabled)
{
e.Effects = DragDropEffects.None;
e.Handled = true;
}
}
private void lbx1_Drop(object sender, DragEventArgs e)
{
string[] droppedFilenames =
e.Data.GetData(DataFormats.FileDrop, true) as string[];
}
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