在代碼背後的GridView中綁定DropDown

Question

我想從代碼後面的GridView中綁定下拉列表。最初，我爲我的gridview生成一個空行，我想在生成空行時綁定下拉列表。請幫助.. ASPX代碼

<form id="form1" runat="server"> 
    <asp:DropDownList ID="ddlSelectWeek" runat="server" OnSelectedIndexChanged="ddlSelectWeek_SelectedIndexChanged" Width="200px" AutoPostBack="true"> 
       <asp:ListItem Text="2015-11-15" Value="2015-11-15"></asp:ListItem> 
       <asp:ListItem Text="2015-11-22" Value="2015-11-22"></asp:ListItem> 
       <asp:ListItem Text="2015-11-29" Value="2015-11-29"></asp:ListItem> 
      </asp:DropDownList> 

    <div> 
      <asp:GridView ID="grvStudentDetails" runat="server" 
      ShowFooter="True" AutoGenerateColumns="False" 
      CellPadding="4" ForeColor="#333333" 
      GridLines="None" OnRowDeleting="grvStudentDetails_RowDeleting"> 
      <Columns> 

       <asp:BoundField DataField="RowNumber" HeaderText="Row ID" /> 


        <asp:TemplateField HeaderText="Task Name"> 
       <ItemTemplate> 

        <asp:DropDownList ID="drpQualification" runat="server"> 
        <asp:ListItem Value="G">test1</asp:ListItem> 
        <asp:ListItem Value="P">test2</asp:ListItem> 
        </asp:DropDownList> 

       </ItemTemplate> 
       <FooterStyle HorizontalAlign="Right" /> 
       <FooterTemplate> 
        <asp:Button ID="ButtonAdd" runat="server" 
        Text="Add New Row" OnClick="ButtonAdd_Click" /> 
       </FooterTemplate> 
       </asp:TemplateField> 


       <asp:TemplateField HeaderText="Day1"> 
       <ItemTemplate> 
        <asp:TextBox ID="txtDay1" runat="server"></asp:TextBox> 
       </ItemTemplate> 
       </asp:TemplateField> 

       <asp:TemplateField HeaderText="Day2"> 
       <ItemTemplate> 
        <asp:TextBox ID="txtDay2" runat="server"></asp:TextBox> 
       </ItemTemplate> 
       </asp:TemplateField> 


       <asp:CommandField ShowDeleteButton="True" /> 
      </Columns> 
      <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" /> 
      <RowStyle BackColor="#EFF3FB" /> 
      <EditRowStyle BackColor="#2461BF" /> 
      <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" /> 
      <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" /> 
      <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" /> 
      <AlternatingRowStyle BackColor="White" /> 
      </asp:GridView> 
     </div> 
     </form> 

代碼背後

protected void ddlSelectWeek_SelectedIndexChanged(object sender, EventArgs e) 
    { 
     DateTime theDate; 
     DateTime.TryParseExact(this.ddlSelectWeek.SelectedValue, "yyyy-MM-dd", CultureInfo.InvariantCulture, DateTimeStyles.None, out theDate); 
     FirstGridViewRow(theDate); 
    } 


    private void FirstGridViewRow(DateTime theDate) 
    { 
     DataTable dt = new DataTable(); 
     DataRow dr = null; 
     dt.Columns.Add(new DataColumn("RowNumber", typeof(string))); 
     dt.Columns.Add(new DataColumn("Col1", typeof(string))); 
     dt.Columns.Add(new DataColumn("Col2", typeof(string))); 
     dt.Columns.Add(new DataColumn("Col3", typeof(string)));  
     dr = dt.NewRow(); 
     for (var i = 1; i < 6; i++) 
     { 
     dr["RowNumber"] = i; 
     dr["Col1"] = string.Empty; 
     dr["Col2"] = string.Empty; 
     dr["Col3"] = string.Empty;  
     dt.Rows.Add(dr); 
     dr = dt.NewRow(); 
     } 
     ViewState["CurrentTable"] = dt; 
     grvStudentDetails.DataSource = dt; 
     grvStudentDetails.DataBind(); 

     for (int i = 2; i < 9; i++) 
     { 
     grvStudentDetails.HeaderRow.Cells[i].Text = theDate.AddDays(i - 2).ToString("ddd") + " " + theDate.AddDays(i - 2).ToShortDateString(); 
     } 
     TextBox txn = (TextBox)grvStudentDetails.Rows[0].Cells[1].FindControl("txtDay1"); 
     txn.Focus(); 
     Button btnAdd = (Button)grvStudentDetails.FooterRow.Cells[2].FindControl("ButtonAdd"); 
     Page.Form.DefaultFocus = btnAdd.ClientID; 
    } 

Answer 1

的基本理念是非常簡單的。訂閱GridView的RowDataBound事件：

<asp:GridView ID="grvStudentDetails" runat="server" 
       ... 
       OnRowDataBound="grvStudentDetails_RowDataBound" 

，並在其中找到該行中創建下拉控制，並將其綁定：

protected void grvStudentDetails_RowDataBound(object sender, GridViewRowEventArgs e) 
{ 
    if (e.Row.RowType == DataControlRowType.DataRow) 
    { 
     DropDownList ddl = (DropDownList)e.Row.FindControl("drpQualification"); 
     ddl.DataSource = your_data_source_here; 
     ddl.DataBind(); 
    } 
}