Csharp实例编程百例.rar

				using System;
				using System.Drawing;
				using System.Collections;
				using System.ComponentModel;
				using System.Windows.Forms;
				using System.Data;
				
				namespace DragDropApp
				{
					/// 
					/// Form1 的摘要说明。
					/// 
					public class Form1 : System.Windows.Forms.Form
					{
						private System.Windows.Forms.TreeView treeView1;
						private System.Windows.Forms.ImageList imageList1;
						private System.ComponentModel.IContainer components;
				
						public Form1()
						{
							//
							// Windows 窗体设计器支持所必需的
							//
							InitializeComponent();
				
							//
							// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
							//
						}
				
						/// 
						/// 清理所有正在使用的资源。
						/// 
						protected override void Dispose( bool disposing )
						{
							if( disposing )
							{
								if (components != null) 
								{
									components.Dispose();
								}
							}
							base.Dispose( disposing );
						}
				
						#region Windows Form Designer generated code
						/// 
						/// 设计器支持所需的方法 - 不要使用代码编辑器修改
						/// 此方法的内容。
						/// 
						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.Dock = System.Windows.Forms.DockStyle.Fill;
							this.treeView1.ImageList = this.imageList1;
							this.treeView1.Name = "treeView1";
							this.treeView1.Nodes.AddRange(new System.Windows.Forms.TreeNode[] {
																								  new System.Windows.Forms.TreeNode("节点0", new System.Windows.Forms.TreeNode[] {
																																												   new System.Windows.Forms.TreeNode("节点1", new System.Windows.Forms.TreeNode[] {
																																																																	new System.Windows.Forms.TreeNode("节点4"),
																																																																	new System.Windows.Forms.TreeNode("节点5")}),
																																												   new System.Windows.Forms.TreeNode("节点2", new System.Windows.Forms.TreeNode[] {
																																																																	new System.Windows.Forms.TreeNode("节点6"),
																																																																	new System.Windows.Forms.TreeNode("节点7")}),
																																												   new System.Windows.Forms.TreeNode("节点3", new System.Windows.Forms.TreeNode[] {
																																																																	new System.Windows.Forms.TreeNode("节点8"),
																																																																	new System.Windows.Forms.TreeNode("节点9")}),
																																												   new System.Windows.Forms.TreeNode("节点10")})});
							this.treeView1.SelectedImageIndex = 1;
							this.treeView1.Size = new System.Drawing.Size(292, 273);
							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.ItemDrag += new System.Windows.Forms.ItemDragEventHandler(this.treeView1_ItemDrag);
							this.treeView1.DragDrop += new System.Windows.Forms.DragEventHandler(this.treeView1_DragDrop);
							// 
							// imageList1
							// 
							this.imageList1.ColorDepth = System.Windows.Forms.ColorDepth.Depth8Bit;
							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(292, 273);
							this.Controls.AddRange(new System.Windows.Forms.Control[] {
																						  this.treeView1});
							this.Name = "Form1";
							this.Text = "DragDropApp";
							this.ResumeLayout(false);
				
						}
						#endregion
				
						/// 
						/// 应用程序的主入口点。
						/// 
						[STAThread]
						static void Main() 
						{
							Application.Run(new Form1());
						}
				
						private void treeView1_ItemDrag(object sender, System.Windows.Forms.ItemDragEventArgs e)
						{
							//启动拖放操作，设置拖放类型为Move(移动)
							DoDragDrop(e.Item ,DragDropEffects.Move );
						}
				
						private TreeNode oldenterNode;	//保存前一个鼠标进入的TreeNode
						
						private void treeView1_DragEnter(object sender, System.Windows.Forms.DragEventArgs e)
						{
							//获取TreeNode类型的数据内容
							object data = e.Data.GetData (typeof(TreeNode));
							//如果有数据，拖放目标允许移动
							if (data!=null)
							{
								e.Effect = DragDropEffects.Move ;
				
							}else e.Effect = DragDropEffects.None;
							//获得当前TreeView的引用
							TreeView theTree = (TreeView)sender;
							//得到鼠标进入的TreeNode的引用
							TreeNode enterNode = theTree.GetNodeAt (treeView1.PointToClient (new Point(e.X ,e.Y)));
							if (enterNode!=null)
							{	//改变进入TreeNode的背景色
								enterNode.BackColor = Color.Blue ;
								//保存此TreeNode，进入下一个时还原背景色
								oldenterNode = enterNode;
							}
						}
				
						private void treeView1_DragOver(object sender, System.Windows.Forms.DragEventArgs e)
						{	//修改鼠标进入TreeNode的背景色，还原上一个TreeNode的背景色
							TreeView theTree = (TreeView)sender;
							TreeNode enterNode = theTree.GetNodeAt (treeView1.PointToClient (new Point(e.X ,e.Y)));
							if ((enterNode != null)&&(enterNode!=oldenterNode)){
								oldenterNode.BackColor = Color.White ;
								enterNode.BackColor = Color.Blue ;
								oldenterNode = enterNode;
							}
						}
				
						private void treeView1_DragDrop(object sender, System.Windows.Forms.DragEventArgs e)
						{	//得到拖放数据，并转换为TreeNode型
							TreeNode theNode = (TreeNode)e.Data .GetData (typeof(TreeNode));
							TreeView theTree = (TreeView)sender;
							//得到当前鼠标进入的TreeNode，即拖放目标TreeNode
							TreeNode targetNode = theTree.GetNodeAt (treeView1.PointToClient (new Point(e.X ,e.Y)));
							if (targetNode!= null)
							{
								TreeNode targetParent = targetNode.Parent ;
								//删除拖放的TreeNode
								theNode.Remove ();
								//添加到目标TreeNode下
								targetNode.Nodes .Add (theNode);
								targetNode.BackColor = Color.White ;
								theTree.SelectedNode = targetNode;
								
							}
						}
					}
				}