在线求助，技术问题？

Question

我在vs.net2003中用TreeView控件建了一个类似Windows资源管理器的东西，
请问在这个控件中怎么实现资源管理器中目录拖放(光在目录中进行拖放)的功能。
请教高手，最好有事例。

Answer 1

详情请看：http://www.7622.com/list/15931.htm
public class Form1 : System.Windows.Forms.Form
 {
  private System.Windows.Forms.TreeView treeView1;
  private System.Windows.Forms.ImageList imageList1;  public Form1()
  {
   InitializeComponent();
  }
  #region Windows 窗体设计器生成的代码
  private void InitializeComponent()
  {
   this.components = new System.ComponentModel.Container();
   System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));
   this.treeView1 = new System.Windows.Forms.TreeView();
   this.imageList1 = new System.Windows.Forms.ImageList(this.components);
   this.SuspendLayout();
   // 
   // treeView1
   // 
   this.treeView1.AllowDrop = true;
   this.treeView1.Font = new System.Drawing.Font("宋体", 12F);
   this.treeView1.ImageList = this.imageList1;
   this.treeView1.Location = new System.Drawing.Point(8, 8);
   this.treeView1.Name = "treeView1";
   this.treeView1.Nodes.AddRange(new System.Windows.Forms.TreeNode[] {
                      new System.Windows.Forms.TreeNode("This is a very simple example", 1, 1),
                      new System.Windows.Forms.TreeNode("but i dont know another way to do such", 2, 2),
                      new System.Windows.Forms.TreeNode("so I think I can realise this a ticky way", 3, 3),
                      new System.Windows.Forms.TreeNode("yes if this is helpful for you ,that is my glad ", 4, 4),
                      new System.Windows.Forms.TreeNode("ok that is all,have a good day", 0, 0)});
   this.treeView1.Size = new System.Drawing.Size(360, 264);
   this.treeView1.TabIndex = 0;
   this.treeView1.DragOver += new System.Windows.Forms.DragEventHandler(this.treeView1_DragOver);
   this.treeView1.DragEnter += new System.Windows.Forms.DragEventHandler(this.treeView1_DragEnter);
   this.treeView1.MouseMove += new System.Windows.Forms.MouseEventHandler(this.treeView1_MouseMove);
   this.treeView1.ItemDrag += new System.Windows.Forms.ItemDragEventHandler(this.treeView1_ItemDrag);
   this.treeView1.DragLeave += new System.EventHandler(this.treeView1_DragLeave);
   this.treeView1.DragDrop += new System.Windows.Forms.DragEventHandler(this.treeView1_DragDrop);
   // 
   // imageList1
   // 
   this.imageList1.ImageSize = new System.Drawing.Size(16, 16);
   this.imageList1.ImageStream = ((System.Windows.Forms.ImageListStreamer)(resources.GetObject("imageList1.ImageStream")));
   this.imageList1.TransparentColor = System.Drawing.Color.Transparent;
   // 
   // Form1
   // 
   this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
   this.ClientSize = new System.Drawing.Size(376, 277);
   this.Controls.Add(this.treeView1);
   this.Name = "Form1";
   this.Text = "Form1";
   this.ResumeLayout(false);  }
  #endregion[STAThread]
  static void Main() 
  {
   Application.Run(new Form1());
  }  ImageForm form;
  private void treeView1_ItemDrag(object sender, System.Windows.Forms.ItemDragEventArgs e)
  {
   TreeNode dragNode = (TreeNode)e.Item;
   form = new ImageForm((Bitmap)imageList1.Images[dragNode.ImageIndex],dragNode.Text);
   form.Load +=new EventHandler(form_Load);
   form.TopLevel = false;
   form.Visible = true;
   this.Controls.Add(form);
   form.BringToFront();   treeView1.DoDragDrop(e.Item,DragDropEffects.Move);
  }  private void treeView1_DragEnter(object sender, System.Windows.Forms.DragEventArgs e)
  {
   if(e.Data.GetDataPresent(typeof(TreeNode)))
   {
    e.Effect = DragDropEffects.Move;
   }
  }  private void treeView1_DragOver(object sender, System.Windows.Forms.DragEventArgs e)
  {
   TreeView tv = sender as TreeView;
   TreeNode dragNode = (TreeNode)e.Data.GetData(typeof(TreeNode));
   Point pt = ((TreeView)sender).PointToClient(new Point(e.X, e.Y));
   form.Visible = true;
   form.Location = new Point(pt.X + 18,pt.Y + 6);
   form.BringToFront();
   TreeNode overNode = ((TreeView)sender).GetNodeAt(pt);
   treeView1.SelectedNode = overNode;
   if(overNode == null || dragNode.Equals(overNode))
   {
    e.Effect = DragDropEffects.None;
   }
   else
   {
    e.Effect = DragDropEffects.Move;
    
   }
  }  private void treeView1_DragDrop(object sender, System.Windows.Forms.DragEventArgs e)
  {
   if(e.Effect == DragDropEffects.Move)
   {
    TreeView tv = sender as TreeView;
    TreeNode dragNode = (TreeNode)e.Data.GetData(typeof(TreeNode));
    Point pt = ((TreeView)sender).PointToClient(new Point(e.X, e.Y));
    TreeNode destinationNode = ((TreeView)sender).GetNodeAt(pt);
    if(destinationNode.Parent == null)
    {
     treeView1.Nodes.Insert(destinationNode.Index,(TreeNode)dragNode.Clone());
     
    }
    else
    {
     destinationNode.Parent.Nodes.Insert(destinationNode.Index,(TreeNode)dragNode.Clone());
    }
    if(dragNode.Parent == null)
    {
     treeView1.Nodes.Remove(dragNode);
    }
    else
    {
     dragNode.Parent.Nodes.Remove(dragNode);
    }
   }
  }
  
  private void treeView1_DragLeave(object sender, System.EventArgs e)
  {
   form.Visible = false;
  }  private void treeView1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
  {
   if(form != null)
   {
    this.Controls.Remove(form);
    form = null;
   }
  }
 }

Answer 2

1）设置 this.treeView1.AllowDrop = true;
2）节点 Node.DoDrag(...);
2)写DragDrop事件