Dynamic loading tree

xiaoxiao2021-03-06  145

Dynamic loading tree Chen Genfa

Proposition: Read the field value from the database as the node of the tree

Implementation: First. Put the field value to the DataSet. Add a root node three. Add corresponding child nodes

The code is as follows;

Using system.drawing;

Using system.collections;

Using system.componentmodel;

Using system.windows.forms;

Using system.data;

Namespace WindowsApplication3

{

///

/// Form1 summary description.

///

Public Class Form1: System.Windows.Forms.form

{

Private system.windows.Forms.treeView TreeView1;

///

/// The required designer variable.

///

Private system.componentmodel.Container Components = NULL;

Public Form1 ()

{

//

// Windows Form Designer Support

//

InitializationComponent ();

//

// Todo: Add any constructor code after INITIALIZECOMPONENT call

//

}

///

/// Clean all the resources being used.

///

Protected Override Void Dispose (Bool Disposing)

{

IF (Disposing)

{

IF (Components! = NULL)

{

Components.dispose ();

}

}

Base.dispose (Disposing);

}

#Region Windows Form Designer Generated Code

///

/// Designer supports the required method - do not use the code editor to modify

/// This method is content.

///

Private vidinitiRizeComponent ()

{

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_aftelect);

//

// 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);

}

#ndregion

///

/// The main entry point for the application.

///

[Stathread]

Static void

Main

()

{

Application.run (New Form1 ());

}

Private void TreeView1_AFTERSELECT (Object Sender, System.Windows.Forms E)

{

}

Private Void Form1_Load (Object Sender, System.EventArgs E)

{

Showform ();

}

Private void showform ()

{

TreeView1.nodes.clear ();

System.windows.Forms.treenode Mnode = New Treenode ("All");

//mnode.imageindex = 1;

TreeView1.nodes.add (mnode);

/ / Assume that DataSet has been obtained

System.windows.Forms.treenode nNode = New Treenode ("in-job");

System.windows.Forms.treenode Pnode = New Treenode ("Deputy");

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);

}

}

}

}

}

Ok, the value of the node is the field value!

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E-mail: chenyu0720@hotmail.com

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