動態加載樹

陳根發



命題：從數據庫讀取字段值作為樹的節點



實現：

一．把字段值取出放到DataSet 中

二．添加一個根節點

三．添加相應的子節點



代碼如下

using System;

using System.Drawing;

using System.Collections;

using System.ComponentModel;

using System.Windows.Forms;

using System.Data;



namespace WindowsApplication3

{

/// <summary>

/// Form1 的摘要說明。

/// </summary>

public class Form1 : System.Windows.Forms.Form

{

private System.Windows.Forms.TreeView treeView1;

/// <summary>

/// 必需的設計器變量。

/// </summary>

private System.ComponentModel.Container components = null;



public Form1()

{

//

// Windows 窗體設計器支持所必需的

//

InitializeComponent();



//

// TODO: 在 InitializeComponent 調用后添加任何構造函數代碼

//

}



/// <summary>

/// 清理所有正在使用的資源。

/// </summary>

protected override void Dispose( bool disposing )

{

if( disposing )

{

if (components != null)

{

components.Dispose();

}

}

base.Dispose( disposing );

}



#region Windows 窗體設計器生成的代碼

/// <summary>

/// 設計器支持所需的方法 - 不要使用代碼編輯器修改

/// 此方法的內容。

/// </summary>

private void InitializeComponent()

{

this.treeView1 = new System.Windows.Forms.TreeView();

this.SuspendLayout();

//

// treeView1

//

this.treeView1.Dock = System.Windows.Forms.DockStyle.Bottom;

this.treeView1.ImageIndex = -1;

this.treeView1.Location = new System.Drawing.Point(0, 137);

this.treeView1.Name = "treeView1";

this.treeView1.SelectedImageIndex = -1;

this.treeView1.Size = new System.Drawing.Size(352, 136);

this.treeView1.TabIndex = 0;

this.treeView1.AfterSelect += new System.Windows.Forms.TreeViewEventHandler(this.treeView1_AfterSelect);

//

// Form1

//

this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);

this.ClientSize = new System.Drawing.Size(352, 273);

this.Controls.Add(this.treeView1);

this.Name = "Form1";

this.Text = "Form1";

this.Load += new System.EventHandler(this.Form1_Load);

this.ResumeLayout(false);



}

#endregion



/// <summary>

/// 應用程序的主入口點。

/// </summary>

[STAThread]

static void Main()

{

Application.Run(new Form1());

}



private void treeView1_AfterSelect(object sender, System.Windows.Forms.TreeViewEventArgs e)

{



}



private void Form1_Load(object sender, System.EventArgs e)

{

ShowForm();

}

private void ShowForm ()

{

treeView1.Nodes.Clear() ;

System.Windows.Forms.TreeNode mNode=new TreeNode("全部");

//mNode.ImageIndex =1;

treeView1.Nodes.Add(mNode) ;

//假設DataSet 已經取得

System.Windows.Forms.TreeNode nNode=new TreeNode("在職");

System.Windows.Forms.TreeNode pNode=new TreeNode("離職");

treeView1.TopNode.Nodes.Add(nNode) ;

treeView1.TopNode.Nodes.Add(pNode) ;

treeView1.Select ();

if (ds.Tables [0].Rows.Count <=0 )

{

return;

}

else

{

// add Add some childtreenodes



foreach(DataRow dr in ds.Tables [0].Rows )

{



System.Windows.Forms.TreeNode aNode=new TreeNode(dr["Name"].ToString() );

System.Windows.Forms.TreeNode bNode=new TreeNode(dr["Name"].ToString());

treeView1.Nodes [0].Nodes[0].Nodes .Add (aNode);

treeView1.Nodes [0].Nodes[1].Nodes .Add (bNode);

}

}

}



}

}

好了，節點的值就