WEB tree structure program design under .NET platform
My last article "Application of tree structure in development" is mainly implemented under Windows Form, and below is the implementation under Web Form.
Database Design
First of all, we are
A table is established in SQL Server 2000
TBTree, the structure design of the table is as follows:
Column name
type of data
description
length
Primary key
Id
Int
Node number
4
Yes
ParentID
Int
Parent node number
4
Context
Nvarchar
The node content we have to display
50
in
SQL Server 2000 CENT Table Script:
Create Table [DBO]. [TBTree] ([Id] [INT] Identity (1, 1) Not Null, [Context] [NVARCHAR] (50) Collate Chinese_PRC_CI_AS NULL, [PARENTID] [INT] NULL) ON [PRIMARY]
Add the following records in the table:
Set Identity_Insert Tbtree On Insert Tbtree (ID, Context, Parentid) Values (1, 'China', 0) Insert Tbtree (ID, Context, Parentid) VALUES (2, 'Beijing', 1) Insert Tbtree (ID, Context, ParentID VALUES (3, 'Tianjin', 1) Insert Tbtree (ID, Context, Parentid) Values (4, 'Hebei Province ", 1) Insert Tbtree (ID, Context, Parentid) Values (5,' Guangdong", 1 ) Insert TBTree (ID, Context, Parentid) Values (6, 'Guangzhou', 5) Insert Tbtree (ID, Context, Parentid) Values (7, 'Sichuan ", 1) Insert Tbtree (ID, Context, Parentid) VALUES (8, 'Chengdu', 7) Insert Tbtree (ID, Context, Parentid) Values (9, 'Shenzhen', 5) Insert Tbtree (ID, Context, Parentid) Values (10, 'Shijiazhuang', 4) Insert TBTree ID, Context, Parentid Values (11, 'Liaoning Province', 1) Insert TBTree (ID, Context, Parentid) Values (12, 'Dalian', 11) Insert Tbtree (ID, Context, Parentid) VALUES (13, ' Shanghai ', 1) Insert TBTree (ID, Context, Parentid) Values (14,' Tianhe Software Park ', 6) Insert Tbtree (ID, Context, Parentid) Values (15,' Shantou ', 5) Set Identity_Insert TBTree Off
Download TreeView control address
Http://msdn.microsoft.com/downloads/sample/internet/asp_dot_net_serverControls/webControls/default.asp
After installation, pass
"Custom Toolbox
"->". NET framework assembly
"
TreeView is added to the toolbox.
Create a new project, choose
Visual Basic.NET Engineering ASP.NET web application, drag a page on the page
TreeView control.
HTML Page:
<% @ Register tagprefix = "iewc" namespace = "microsoft.web.ui.webcontrols" assembly = "Microsoft.Web.ui.WebControls, version =
1.0.2
.26, Culture = neutral, publickeytoken = 31BF3856AD364E35 "%>
<% @ Page language = "vb" autoeventwireup = "false" codebehind = "Webform1.aspx.vb" inherits = "tree.webform1"%>%>
3C
// DTD HTML 4.0 Transitional // En ">
Webform1 </ Title></p>
<p><meta name = "generator" Content = "Microsoft Visual Studio .NET 7.0"></p>
<p><meta name = "code_language" content = "Visual Basic 7.0"></p>
<p><meta name = "vs_defaultclientscript" content = "javascript"></p>
<p><meta name = "vs_targetschema" content = "http://schemas.microsoft.com/intellisense/ie5"></p>
<p></ HEAD></p>
<p><body ms_positioning = "gridLayout"></p>
<p><form id = "form1" method = "post" runat = "server"></p>
<p><Font face = "Song"></p>
<p><IEWC: TreeView ID = "TreeView1" Style = "Z-Index: 101; Left: 39px; Top: 68px" Runat = "Server"> </ iewc: TreeView> </ font></p>
<p></ form></p>
<p></ body></p>
<p></ Html></p>
<p>Backstage code:</p>
<p>Private Sub Page_Load (Byvale AS System.Object, Byval E AS System.Eventargs) Handles MyBase.LOAD</p>
<p>DIM DS AS New DataSet ()</p>
<p>DIM CN As New SqlConnection ()</p>
<p>Try</p>
<p>'Initializing the connection string</p>
<p>Cn.connectionstring = "data source = pmserver; initial catalog = Benchmark; Persist security info = false; user ID = sa; password = sa;" cn open ()</p>
<p>DIM ADP As SqldataAdapter = New SqldataAdapter ("Select * from TBTree", CN)</p>
<p>ADP.FILL (DS)</p>
<p>Me.ViewState ("DS") = DS</p>
<p>Catch exception</p>
<p>#If debug the</p>
<p>Session ("error") = ex.toString ()</p>
<p>Response.Redirect ("ERROR.ASPX") 'Jump Program Public Error Processing Page</p>
<p>#End IF</p>
<p>Finally</p>
<p>'Close connection</p>
<p>Cn.close ()</p>
<p>END TRY</p>
<p>'Call the recursive function, complete the generation of the tree structure</p>
<p>AddTree (0, Nothing)</p>
<p>End Sub</p>
<p>'Removing the node of adding a tree</p>
<p>Private Sub Addtree (byval Parentid As Integer, Byval Pnode As Treenode)</p>
<p>DIM DS AS Dataset</p>
<p>DS = Me.ViewState ("DS")</p>
<p>DIM DVTREE AS New DataView ()</p>
<p>DVTree = New DataView (ds.tables (0))</p>
<p>'Filter ParentID to get all current child nodes</p>
<p>Dvtree.rowfilter = "ParentId =" ParentId.tostring</p>
<p>DIM ROW AS DATAROWVIEW</p>
<p>For Each Row in Dvtree</p>
<p>Dim node as new treenode ()</p>
<p>If pnode is nothing then 'judgments if the root node</p>
<p>'Add root node</p>
<p>Node.text = row ("context"). Tostring ()</p>
<p>TreeView1.nodes.add (Node)</p>
<p>Node.expanded = true</p>
<p>'Regeneration again</p>
<p>AddTree (INT32.PARSE (Row ("ID"). Tostring ()), NODE</p>
<p>Else</p>
<p>'Add a child node of the current node</p>
<p>Node.text = row ("context"). Tostring ()</p>
<p>Pnode.nodes.add (node)</p>
<p>Node.expanded = true</p>
<p>'Regeneration again</p>
<p>AddTree (INT32.PARSE (Row ("ID"). Tostring ()), NODE</p>
<p>END IF</p>
<p>NEXT</p>
<p>End Sub</p>
<p>C # version:</p>
<p>Using system;</p>
<p>Using system.collections;</p>
<p>Using system.componentmodel;</p>
<p>Using system.data;</p>
<p>Using system.drawing;</p>
<p>Using system.Web;</p>
<p>Using system.Web.SessionState;</p>
<p>Using system.Web.ui;</p>
<p>Using system.Web.ui.webcontrols;</p>
<p>Using system.Web.ui.htmlcontrols;</p>
<p>USING Microsoft.Web.ui.WebControls;</p>
<p>Using system.data.sqlclient;</p>
<p>Namespace treecs {</p>
<p>/// <summary></p>
<p>/// WebForm1 summary description</p>
<p>/// </ summary></p>
<p>Public class Webform1: System.Web.ui.page</p>
<p>{</p>
<p>Protected Microsoft.Web.ui.WebControls.treeView TreeView1;</p>
<p>Private Void Page_Load (Object Sender, System.EventArgs E)</p>
<p>{</p>
<p>/ / Define database connections</p>
<p>SqlConnection CN = New SQLCONNECTION ();</p>
<p>Try</p>
<p>{</p>
<p>// Initialize the connection string</p>
<p>Cn.connectionstring = "data source = pmserver; initial catalog = Benchmark; Persist security info = false; user ID = sa; password = sa;";</p>
<p>Cn.open ();</p>
<p>SqlDataAdapter ADP = New SqldataAdapter ("Select * from TBTree", CN);</p>
<p>DataSet DS = New Dataset ();</p>
<p>ADP.FILL (DS);</p>
<p>THIS.VIEWSTATE ["DS"] = DS;</p>
<p>}</p>
<p>Catch (Exception EX)</p>
<p>{</p>
<p>Session ["Error"] = ex.totring ();</p>
<p>Response.Redirect ("Error.aspx"); // Public Error Processing Page of Jump Programs</p>
<p>}</p>
<p>Finally</p>
<p>{</p>
<p>Cn.close ();</p>
<p>}</p>
<p>// Call the recursive function and complete the generation of the tree structure</p>
<p>AddTree (0, (Treenode) NULL;</p>
<p>}</p>
<p>// Regenerate the node of the tree</p>
<p>Public void addtree (int parentid, treenode pnode)</p>
<p>{</p>
<p>DataSet DS = (DataSet) this.viewState ["DS"];</p>
<p>DataView DVTree = New DataView (ds.tables [0]);</p>
<p>// Filter ParentID to get all the current child nodes</p>
<p>Dvtree.rowfilter = "[parentid] =" ParentID;</p>
<p>Foreach (DataRowView Row In Dvtree)</p>
<p>{</p>
<p>Treenode node = new treenode ();</p>
<p>IF (pnode == null)</p>
<p>{// Add root node</p>
<p>Node.text = row ["context"]. TOSTRING ();</p>
<p>TreeView1.nodes.Add (Node);</p>
<p>Node.expanded = true;</p>
<p>AddTree (Int32.Parse (ROW ["ID"]. TOSTRING ()), Node); // Regeneration again</p>
<p>}</p>
<p>Else</p>
<p>{// Add the child node of the current node</p>
<p>Node.text = row ["context"]. TOSTRING ();</p>
<p>Pnode.nodes.add (node);</p>
<p>Node.expanded = true;</p>
<p>AddTree (Int32.Parse (ROW ["ID"]. TOSTRING ()), Node); // Regeneration again</p>
<p>}</p>
<p>}</p>
<p>}</p>
<p>#Region Web Form Designer Generated Code</p>
<p>Override protected void oninit (Eventargs E)</p>
<p>{</p>
<p>//</p>
<p>// Codegen This call is required for the ASP.NET Web Form Designer.</p>
<p>//</p>
<p>InitializationComponent ();</p>
<p>Base.onit (e);</p>
<p>}</p>
<p>/// <summary></p>
<p>/// Designer supports the required method - do not use the code editor to modify</p>
<p>// This method's content</p>
<p>/// </ summary></p>
<p>Private vidinitiRizeComponent ()</p>
<p>{</p>
<p>This.Load = New System.EventHandler (this.page_load);</p>
<p>}</p>
<p>#ndregion</p>
<p>}</p>
<p>}</p>
<p>Postscript: Please read the reader to modify the connection string settings in the program.</p>
<p>Disclaimer: The right to copyright and interpretation of this article belongs to Li Honggen, if you need to reprint, please keep your full content and this statement.</p>
<p>QQ: 21177563</p>
<p>MSN: lihonggen@hotmail.com</p>
<p>Column:</p>
<p>Http://www.9cbs.net/develop/author/netauthor/lihonggen0/0/</p></div><div class="text-center mt-3 text-grey">
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