❝

  • The initial public account is Dotnet9

  • Author: The Wolf at the end of the desert

  • Date: 202-11-27

First, before the beginning of this article

When uploading a file, an upload button is generally provided. Click upload, and the dialog box for selecting a file (or directory) pops up. After selecting a file (or directory), obtain the file path from the dialog box and upload the file.

Dialog box to select a file

The selection dialog box code is as follows:

OpenFileDialog openFileDialog = new OpenFileDialog(); Openfiledialog. Title = "select Exe file "; OpenFileDialog. Filter = "exe file | *. Exe"; openFileDialog.FileName = string.Empty; openFileDialog.FilterIndex = 1; openFileDialog.Multiselect = false; openFileDialog.RestoreDirectory = true; openFileDialog.DefaultExt = "exe"; if (openFileDialog.ShowDialog() == false){ return; }string txtFile = openFileDialog.FileName;Copy the code

But in general, the best user experience is to directly mouse drag and drop files:

Baidu network disk drag upload files

The following is a brief description of the implementation of file drag and drop in WPF.

How to drag and drop files in WPF?

It’s as simple as dragging and dropping the receiving control (or container) to register two events: DragEnter and Drop.

Let’s look at my implementation:

Drag and drop files into QuickApp

Register events in Xaml

Registration event:

<Grid  MouseMove="Grid_MouseMove" AllowDrop="True" Drop="Grid_Drop" DragEnter="Grid_DragEnter">
Copy the code

Event handling methods:

  1. Grid_DragEnter method

    private void Grid_DragEnter(object sender, DragEventArgs e){ if (e.Data.GetDataPresent(DataFormats.FileDrop)) { e.Effects = DragDropEffects.Link; } else { e.Effects = DragDropEffects.None; }}

DragDropEffects.Link: Handles drag-and-drop file operations

  1. Grid_Drop method

This is the way to handle actual drag and drop, get the drag and drop file path (if it is the operating system file shortcut (extension called LNK), you need to use com components (not the paper explain the key, specific see this open source project) to obtain the actual file path), can handle the subsequent operations (such as file upload).

private void Grid_Drop(object sender, DragEventArgs e){ try { var fileName = ((System.Array)e.Data.GetData(DataFormats.FileDrop)).GetValue(0).ToString(); MenuItemInfo menuItem = new MenuItemInfo() { FilePath = fileName }; If (filename.tolower ().endswith (" LNK ")) {WshShell shell = new WshShell(); IWshShortcut wshShortcut = (IWshShortcut)shell.CreateShortcut(fileName); menuItem.FilePath = wshShortcut.TargetPath; } ImageSource imageSource = SystemIcon.GetImageSource(true, menuItem.FilePath); System.IO.FileInfo file = new System.IO.FileInfo(fileName); if (string.IsNullOrWhiteSpace(file.Extension)) { menuItem.Name = file.Name; } else { menuItem.Name = file.Name.Substring(0, file.Name.Length - file.Extension.Length); } menuItem.Type = MenuItemType.Exe; if (ConfigHelper.AddNewMenuItem(menuItem)) { AddNewMenuItem(menuItem); } } catch (Exception ex) { MessageBox.Show(ex.Message); }}Copy the code

This passage is Over

Function is very simple, not profound, can use on the line.

❝

Time is like water, can only flow to not flow back.

  • The initial public account is Dotnet9

  • Author: The Wolf at the end of the desert

  • Date: 202-11-27