数据库取值形成xml实现tree

Create three .aspx files TreeViewDataSet.aspx %@ import Namespace="Microsoft.Web.UI.WebControls" % %@ Register TagPrefix="IE" Namespace="Microsoft.Web.UI.WebControls" Assembly="Microsoft.Web.UI.WebControls" % html head title TreeViewDataSe

Create three .aspx files

TreeViewDataSet.aspx

AutoPostBack="True"
TreeNodeSrc="Categories.aspx"
Runat="Server"/>

Categories.aspx

mycon=New Sqlconnection("Server=localhost;UID=sa;PWD=secret;Database=Northwind")
strQuery="select categoryname as Text,'products.aspx?catid='
+LTRIM(STR(CategoryID))" & _
"As TreeNodeSrc from Categories As TreeNode for xml auto, XMLDATA"
cmdCategories=new SqlCommand(strQuery,mycon)
dsCategories=New DataSet
dsCategories.ReadXML(cmdCategories.ExecuteXmlReader(),XmlReadMode.Fragment)
dsCategories.DataSetName="TREENODES"
dsCategories.WriteXml(Response.OutputStream)
end sub

Products.aspx

mycon=New Sqlconnection("Server=localhost;UID=sa;PWD=secret;Database=Northwind")
strQuery="select Productname as Text from products As TreeNode" & _
" where CategoryID=@categoryID for xml auto, XMLDATA "
cmdproducts=new SqlCommand(strQuery,mycon)
cmdproducts.Parameters.Add(New SqlParameter("@categoryID",Request.QueryString("catID")))
mycon.open()
dsproducts=New DataSet
dsproducts.ReadXML(cmdproducts.ExecuteXmlReader(),XmlReadMode.Fragment)
dsproducts.DataSetName="TREENODES"
dsproducts.WriteXml(Response.OutputStream)
mycon.close()
end sub