DropDownList的树形结构的详细介绍

Sub bind_DDL()

Dim dtb As DataTable = New DataTable("test")

Dim myDataColumn As New DataColumn

Dim drow As DataRow

Dim i As Int32

myDataColumn.DataType = System.Type.GetType("System.String")

myDataColumn.ColumnName = "c1"

dtb.Columns.Add(myDataColumn)

drow = dtb.NewRow()

drow("c1") = "ItemA"

dtb.Rows.Add(drow)

For i = 0 To 2

drow = dtb.NewRow()

drow("c1") = Server.HtmlDecode("  ") + "ItemA" + i.ToString()

dtb.Rows.Add(drow)

Next

drow = dtb.NewRow()

drow("c1") = "ItemB"

dtb.Rows.Add(drow)

For i = 0 To 2

drow = dtb.NewRow()

drow("c1") = Server.HtmlDecode("  ") + "ItemB" + i.ToString()

dtb.Rows.Add(drow)

Next

DropDownList1.DataSource = dtb

DropDownList1.DataTextField = "c1"

DropDownList1.DataValueField = "c1"

DropDownList1.DataBind()

End Sub

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