VS.Net 中为ComboBox 和DropDownList 添加行...
VS.Net 中为ComboBox 和DropDownList 添加行因为ASP.Net WebForm 的DropDownList 和 WinForm 中的ComboBox 表现出来的形式是相同的，但我们添加的做法却是不同的，我们下面为其添加行做一个比较。
---这里的添加是 绑定数据源之后的添加—
-Asp.net WebForm
Dim ds As DataSet = iobj_sql.GetRowsByQuery(Sql)
Dim dItem As ListItem = New ListItem("要添加的行", "要添加行的 Value")
FilterProjectOwerDropDownList.DataSource = ds
FilterProjectOwerDropDownList.DataTextField = "Name"
FilterProjectOwerDropDownList.DataValueField = "Value"
FilterProjectOwerDropDownList.DataBind()
FilterProjectOwerDropDownList.Items.Insert(0, dItem)
-WinForm
Dim ldtb_temp As New DataTable
ldtb_temp.Columns.Add("Name")
ldtb_temp.Columns.Add("Value")
Dim ldtb_row As DataRow
ldtb_row = ldtb_temp.NewRow
ldtb_row.Item("Name") = "Name1"
ldtb_row.Item("Value") = "Value1"
ldtb_temp.Rows.Add(ldtb_row)
ldtb_row = ldtb_temp.NewRow
ldtb_row.Item("Name") = "Name2"
ldtb_row.Item("Value") = "Value2"
ldtb_temp.Rows.Add(ldtb_row)
ComboBox1.DataSource = ldtb_temp
ComboBox1.DisplayMember = "Name"
'----上面绑定完成，下面加你想加的内容----
ldtb_row = ldtb_temp.NewRow
ldtb_row.Item("Name") = "加一个空行"
ldtb_row.Item("Value") = "加一个空行Value"
ldtb_temp.Rows.InsertAt(ldtb_row, 0)
Me.ComboBox1.SelectedIndex = 0
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