当autogenerate列属性id为true时，gridview with dropdownlist

问题描述

先生，我有一个gridview，其属性为autogenerate列true。我想用下拉列表绑定每一列。



我的代码如下： -

sir, i have a gridview with the property of autogenerate column true. i want to bind each column with dropdownlist.

My code is like :-

Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles Gridview1.RowDataBound



     Dim dl As New DropDownList()
     cmd1.CommandText = "Select * from ClassRoom order by ClassRoom"
     Dim dr2 = cmd1.ExecuteReader
     dl.DataSource = dr2
     dl.AppendDataBoundItems = True
     dl.DataTextField = "ClassRoom"
     dl.DataValueField = "ClassRoom"
     dl.DataBind()
     dl.SelectedItem.Text = ""
     dr2.Close()



             For Each row As GridViewRow In Gridview1.Rows
                 row.Cells(2).Controls.Add(dl)
                 row.Cells(3).Controls.Add(dl)
             Next



 End Sub

此代码仅添加下拉列表单元格（3）不在单元格中（2）如何在两个单元格中添加下拉列表。

this code add dropdownlist only cell(3) not in cell(2) how can i add dropdownlist in both cell.

推荐答案

For Each row As GridViewRow In Gridview1.Rows
    For i = 1 to 2
        Dim dl As New DropDownList()
        cmd1.CommandText = "Select * from ClassRoom order by ClassRoom"
        Dim dr2 = cmd1.ExecuteReader
        dl.DataSource = dr2
        dl.AppendDataBoundItems = True
        dl.DataTextField = "ClassRoom"
        dl.DataValueField = "ClassRoom"
        dl.DataBind()
        dl.SelectedItem.Text = ""
        dr2.Close()
        row.Cells(i).Controls.Add(dl)
    Next i
Next

看到类似的问题： []



我真的建议创建 DropDownList 并在设计时设置其属性： []

See similar question: Re: GridView DropDownList programmatically add items on RowDataBound[^]

I really do recommend to create DropDownList and set its properties on design time: Walkthrough: Displaying a Drop-Down List While Editing in the GridView Web Server Control[^]

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