为什么不工作拖放？

-3

我需要从window1.listbox拖放到window2.panel中。为什么不工作拖放？

写：

public partial class Form1 : Form 
{ 
    Routers r = new Routers(); 
    public Form1() 
    { 
     InitializeComponent(); 

     r.Show(); 

     panel1.DragOver += new DragEventHandler(panel1_DragOver); 
     panel1.DragEnter += new DragEventHandler(panel1_DragEnter); 
     panel1.MouseUp += new MouseEventHandler(panel1_MouseUp); 
     panel1.DragDrop += new DragEventHandler(panel1_DragDrop); 
     panel1.AllowDrop = true; 

     this.AllowDrop = true; 
     this.DragDrop += new DragEventHandler(Form1_DragDrop); 
    } 

    void Form1_DragDrop(object sender, DragEventArgs e) 
    { 
     throw new NotImplementedException(); 
    } 

    void panel1_DragDrop(object sender, DragEventArgs e) 
    { 
     if (isDrop == false) 
     { 
      isDrop = true; 
      Button b = new Button(); 
      b.Text = (string)e.Data.GetData(DataFormats.StringFormat); 
      b.Location = new Point(e.X, e.Y); 

      this.panel1.Controls.Add(b); 
     } 
    } 

    void panel1_MouseUp(object sender, MouseEventArgs e) 
    { 
     if (isDrop) 
     { 
      isDrop = false; 
     } 
    } 
    bool isDrop = false; 

    void panel1_DragEnter(object sender, DragEventArgs e) 
    { 
     isDrop = false; 
     if (e.Data.GetDataPresent(DataFormats.StringFormat)) 
      e.Effect = DragDropEffects.None; 
    } 
    void panel1_DragOver(object sender, DragEventArgs e) 
    { 
     e.Effect = DragDropEffects.None; 
    } 
}

写窗口2

public partial class Routers : Form 
    { 
     public Routers() 
     { 
      InitializeComponent(); 

      this.listBox1.MouseDown += new MouseEventHandler(listBox1_MouseDown); 
      this.listBox1.DragOver += new DragEventHandler(listBox1_DragOver); 

     } 


     private void listBox1_DragOver(object sender, DragEventArgs e) 
     { 
      e.Effect = DragDropEffects.Move; 
     } 

     private void listBox1_MouseDown(object sender, MouseEventArgs e) 
     { 
      if (this.listBox1.SelectedItem != null) 
      { 
       string item = this.listBox1.SelectedItem.ToString(); 
       this.listBox1.DoDragDrop(item, DragDropEffects.Move); 
      } 
     } 


    }

DragDrop事件无法正常工作。，拖动时不改变光标

来源

2011-03-06 Mediator

拖动目标时需要将e.Effect设置为None以外的值。

来源

2011-03-06 14:23:04 SLaks

我设置复制，链接，更 – Mediator 2011-03-06 14:26:28

不，你不是。您需要在“DragOver”和“DragEnter”中设置效果。 – SLaks 2011-03-06 14:34:29

SLaks，这是怎么回事？ – Mediator 2011-03-08 11:57:20

的解决方案请参见本主题：

DragDrop event not raised

private void Form1_DragEnter(object sender, DragEventArgs e) 
{ 
    e.Effect = DragDropEffects.All; 
}

来源

2013-12-20 15:28:41 Amaranth

为什么不工作拖放？

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