WPF Drag and Drop Text File into application

Question

I am trying to drag a text file into my C# WPF application to capture the file location. The things I have tried so far are as follows:

Set the AllowDrop property to true
Add the DragEnter, DragOver and Drop events - none of them fire - all i get is a black circle with a line through it which, i think means, unavailable.
Added the following to the app manifest level="requireAdministrator" uiAccess="false" />

I have utilised the OpenFileDialog method as an alternative but would be nice to have both options.

could you show some code please? and you want just drop the name of file but drop in what?? — Frenchy

mm8 mm8 · Accepted Answer · 2018-10-03T16:00:39

You could handle the PreviewDragOver and Drop events. Below is an example of a WPF TextBox on which you can drop a file from the file explorer. The path of the first dropped file will appear in the TextBox.

private void TextBox_Drop(object sender, DragEventArgs e)
{
    if (e.Data.GetDataPresent(DataFormats.FileDrop))
    {
        string[] files = e.Data.GetData(DataFormats.FileDrop) as string[];
        if (files != null && files.Length > 0)
        {
            ((TextBox)sender).Text = files[0];
        }
    }
}

private void TextBox_PreviewDragOver(object sender, DragEventArgs e)
{
    e.Handled = true;
}

XAML:

<TextBox AllowDrop="True" PreviewDragOver="TextBox_PreviewDragOver" Drop="TextBox_Drop" />

WPF Drag and Drop Text File into application

1 Answers