在 wpf 中拖放路径 [英] Drag and drop a path in a wpf

问题描述

是否可以使用鼠标事件处理程序在 wpf 中拖放路径?特别是我想用鼠标左键拖动一条路径并将其鼠标放在网格上.如何做到这一点?

Is it possible to drag and drop a path in a wpf using Mouse Eventhandlers? In partcular I want to drag a path with the left mouse button and to mouse it on the grid. How can this be done?

推荐答案

试试这个:

鉴于:文本框名称为TextBox1"

Given: TextBox name is "TextBox1"

    public MainWindow()
    {
        // Initialize UI
        InitializeComponent();

        // Loaded event
        this.Loaded += delegate
            {
                TextBox1.AllowDrop = true;
                TextBox1.PreviewDragEnter += TextBox1PreviewDragEnter;
                TextBox1.PreviewDragOver += TextBox1PreviewDragOver;
                TextBox1.Drop += TextBox1DragDrop;
            };
    }

    /// <summary>
    /// We have to override this to allow drop functionality.
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    void TextBox1PreviewDragOver(object sender, DragEventArgs e)
    {
        e.Handled = true;
    }

    /// <summary>
    /// Evaluates the Data and performs the DragDropEffect
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void TextBox1PreviewDragEnter(object sender, DragEventArgs e)
    {
        if (e.Data.GetDataPresent(DataFormats.FileDrop))
        {
            e.Effects = DragDropEffects.Copy;
        }
        else
        {
            e.Effects = DragDropEffects.None;
        }
    }

    /// <summary>
    /// The drop activity on the textbox.
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void TextBox1DragDrop(object sender, DragEventArgs e)
    {
        // Get data object
        var dataObject = e.Data as DataObject;

        // Check for file list
        if (dataObject.ContainsFileDropList())
        {
            // Clear values
            TextBox1.Text = string.Empty;

            // Process file names
            StringCollection fileNames = dataObject.GetFileDropList();
            StringBuilder bd = new StringBuilder();
            foreach (var fileName in fileNames)
            {
                bd.Append(fileName + "
");
            }

            // Set text
            TextBox1.Text = bd.ToString();
        }
    }

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