在編輯的GridView，下拉列表值不會在所選項目的可變

值下拉列表（編輯gridview的）存儲正在返回NULL。它應該返回選定值..在編輯的GridView，下拉列表值不會在所選項目的可變

守則aspx.cs文件::

GridViewRow row = (GridViewRow)GridView1.Rows[e.RowIndex]; 
    DropDownList ct = (DropDownList)row.FindControl("DropDownList6"); 
    string ctype = ct.SelectedItem.Text; 
    string sql1 = ("Select Case_Type_Value FROM Case_Type where Case_Type_Text ='" + ctype + "' "); 


    DropDownList cs = (DropDownList)row.FindControl("DropDownList3"); 
    string cstatus = cs.SelectedItem.Text; 
    string sql2 = ("Select Case_Status_Value FROM Case_Status where Case_Status_Text ='" + cstatus + "' "); 


    SqlConnection con= new SqlConnection(ConfigurationManager.ConnectionStrings["con"].ToString()); 
    SqlCommand cmd1 = new SqlCommand(sql1, con); 
    SqlCommand cmd2 = new SqlCommand(sql2, con); 

    con.Open(); 
    int v1 = Convert.ToInt32(cmd1.ExecuteScalar()); 
    int v2 = Convert.ToInt32(cmd2.ExecuteScalar()); 
    con.Close(); 

    SqlCommand cmd = new SqlCommand("UPDATE Table SET Case_Type = @Case_Type, Case_Status = @Case_Status, con); 
    cmd.Parameters.AddWithValue("@Case_Type", v1); 
    cmd.Parameters.AddWithValue("@Case_Status", v2);

下面是該頁面的ASPX代碼：

<asp:GridView ID="GridView1" runat="server" CellPadding="5" ForeColor="#333333" width="1000px" 
       GridLines="None" OnPageIndexChanging="gridView_PageIndexChanging" 
       AllowSorting="True" OnSorting="gridView_Sorting" AutoGenerateColumns="False" OnRowUpdating="GridView1_RowUpdating" 
       BorderStyle="Outset" CellSpacing="1" Font-Names="Cambria" 
       Font-Size="Small" AllowPaging="True" ShowFooter="True" 
       ShowHeaderWhenEmpty="True" 
       DataSourceID="SqlDataSource1" onselectedindexchanged="GridView1_SelectedIndexChanged" 
       > 
       <AlternatingRowStyle BackColor="White" ForeColor="#284775" /> 
       <Columns> 
        <asp:TemplateField HeaderText="Case Number" SortExpression="case_number"> 
         <EditItemTemplate> 
          <asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("case_number") %>'></asp:TextBox> 
         </EditItemTemplate> 
         <ItemTemplate> 
          <asp:Label ID="Label7" runat="server" Text='<%# Bind("case_number") %>'></asp:Label> 
         </ItemTemplate> 
        </asp:TemplateField> 
        <asp:TemplateField HeaderText="Case Name" SortExpression="case_name"> 
         <EditItemTemplate> 
          <asp:TextBox ID="TextBox3" runat="server" Text='<%# Bind("case_name") %>'></asp:TextBox> 
         </EditItemTemplate> 
         <ItemTemplate> 
          <asp:Label ID="Label8" runat="server" Text='<%# Bind("case_name") %>'></asp:Label> 
         </ItemTemplate> 
        </asp:TemplateField> 
        <asp:TemplateField HeaderText="Case Type" SortExpression="Case_Type_Text"> 
         <EditItemTemplate> 
          <asp:DropDownList ID="DropDownList6" runat="server" 
           DataSourceID="SqlDataSource2" DataTextField="Case_Type_Text" 
           DataValueField="Case_Type_Text" SelectedValue='<%# Bind("Case_Type_Text") %>'> 
           <asp:ListItem>--Select--</asp:ListItem> 
          </asp:DropDownList> 
         </EditItemTemplate> 
         <ItemTemplate> 
          <asp:Label ID="Label9" runat="server" Text='<%# Bind("Case_Type_Text") %>'></asp:Label> 
         </ItemTemplate> 
        </asp:TemplateField> 

        <asp:TemplateField HeaderText="Case Status" SortExpression="Case_Status_Text"> 
         <EditItemTemplate> 
          <asp:DropDownList ID="DropDownList3" runat="server" 
          DataSourceID="SqlDataSource3" DataTextField="Case_Status_Text" DataValueField="Case_Status_Text" 
          SelectedValue='<%# Bind("Case_Status_Text") %>'> 
          </asp:DropDownList> 
         </EditItemTemplate> 
        <ItemTemplate> 
          <asp:Label ID="Label1" runat="server" Text='<%# Bind("Case_Status_Text") %>'></asp:Label> 
        </ItemTemplate> 
        </asp:TemplateField> 


        <asp:TemplateField HeaderText="Assigned Date" SortExpression="assigned_date"> 
         <EditItemTemplate> 
          <asp:TextBox ID="TextBox5" runat="server" 
           Text='<%# Bind("assigned_date", "{0:d}") %>'></asp:TextBox> 
         </EditItemTemplate> 
         <ItemTemplate> 
          <asp:Label ID="Label10" runat="server" 
           Text='<%# Bind("assigned_date", "{0:d}") %>'></asp:Label> 
         </ItemTemplate> 
        </asp:TemplateField> 
        <asp:TemplateField HeaderText="Assigned To" SortExpression="assigned_to"> 
         <EditItemTemplate> 
          <asp:DropDownList ID="DropDownList7" runat="server" 
           DataSourceID="SqlDataSource4" DataTextField="User_Name" 
           DataValueField="User_Name" SelectedValue='<%# Bind("assigned_to") %>'> 
          </asp:DropDownList> 
         </EditItemTemplate> 
         <ItemTemplate> 
          <asp:Label ID="Label11" runat="server" Text='<%# Bind("assigned_to") %>'></asp:Label> 
         </ItemTemplate> 
        </asp:TemplateField> 


        <asp:TemplateField HeaderText="Date Withdrawn" SortExpression="date_withdrawn"> 
         <EditItemTemplate> 
          <cc1:DatePicker ID="DatePicker5" runat="server" DateFormat="yyyy-MM-dd" 
           CalendarDate='<%# Bind("date_withdrawn") %>' TextCssClass="" /> 
         </EditItemTemplate> 
         <ItemTemplate> 
          <asp:Label ID="Label4" runat="server" 
           Text='<%# Bind("date_withdrawn", "{0:d}") %>'></asp:Label> 
         </ItemTemplate> 
        </asp:TemplateField> 

        <asp:TemplateField HeaderText="Date Delivered" SortExpression="date_delivered"> 
         <EditItemTemplate> 
          <cc1:DatePicker ID="DatePicker7" runat="server" 
           CalendarDate='<%# Bind("date_delivered") %>' TextCssClass="" 
           /> 
         </EditItemTemplate> 
         <ItemTemplate> 
          <asp:Label ID="Label6" runat="server" 
           Text='<%# Bind("date_delivered", "{0:d}") %>'></asp:Label> 
         </ItemTemplate> 
        </asp:TemplateField> 


        <asp:TemplateField HeaderText="QC By" SortExpression="qc_by"> 
         <EditItemTemplate> 
          <asp:DropDownList ID="DropDownList5" runat="server" 
          DataSourceID="SqlDataSource4" DataTextField="User_Name" DataValueField="User_Name" 
          SelectedValue='<%# Bind("qc_by") %>'> 
          </asp:DropDownList> 
         </EditItemTemplate> 
        <ItemTemplate> 
          <asp:Label ID="Label2" runat="server" Text='<%# Bind("qc_by") %>'></asp:Label> 
        </ItemTemplate> 
        </asp:TemplateField> 


        <asp:TemplateField HeaderText="QC Date" SortExpression="qc_date"> 
         <EditItemTemplate> 
          <cc1:DatePicker ID="DatePicker6" runat="server" 
           CalendarDate='<%# Bind("qc_date") %>' TextCssClass="" 
           /> 
         </EditItemTemplate> 
         <ItemTemplate> 
          <asp:Label ID="Label5" runat="server" Text='<%# Bind("qc_date", "{0:d}") %>'></asp:Label> 
         </ItemTemplate> 
        </asp:TemplateField> 

        <asp:TemplateField HeaderText="Additional Notes"> 
         <EditItemTemplate> 
          <asp:TextBox ID="TextBox1" runat="server" 
           Text='<%# Bind("additional_notes") %>' TextMode="MultiLine"></asp:TextBox> 
         </EditItemTemplate> 
         <ItemTemplate> 
          <asp:Label ID="Label3" runat="server" Text='<%# Bind("additional_notes") %>'></asp:Label> 
         </ItemTemplate> 
        </asp:TemplateField> 
        <asp:CommandField ShowEditButton="True" ButtonType="Button" 
         CausesValidation="False" /> 
       </Columns> 
       <EditRowStyle BackColor="#999999" /> 
       <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" /> 
       <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" /> 
       <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" /> 
       <RowStyle BackColor="#F7F6F3" ForeColor="#333333" /> 
       <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" /> 
       <SortedAscendingCellStyle BackColor="#E9E7E2" /> 
       <SortedAscendingHeaderStyle BackColor="#506C8C" /> 
       <SortedDescendingCellStyle BackColor="#FFFDF8" /> 
       <SortedDescendingHeaderStyle BackColor="#6F8DAE" /> 
      </asp:GridView>

來源

2013-08-02 CodeXerox

你可以用aspx頁面gridview標記更新問題嗎？並在哪些情況下可以找到控制權？ – Damith

正如Damith所說，「你在哪個事件中找到控制」？ – zey

GridView1_RowUpdating – CodeXerox

嘗試喜歡這個，

GridViewRow row = (GridViewRow)GridView1.Rows[e.RowIndex]; 
DropDownList ct = (DropDownList)row.Cells[2].FindControl("DropDownList6"); 
string ctype = ct.SelectedValue; 

DropDownList cs = (DropDownList)row.Cell[3].FindControl("DropDownList3"); 
string cstatus = cs.SelectedValue;

來源

2013-08-02 09:28:09 zey

不工作..已經嘗試過的..我使用行:::: GridViewRow行=（GridViewRow）GridView1.Rows [e.RowIndex] ; – CodeXerox

我編輯了Ankit :) – zey

你在代碼中編輯了什麼，你能告訴我.. ??因爲我看的舊代碼.. – CodeXerox

GridViewRow row = grdVw.Rows[e.RowIndex]; 
String str = Convert.ToString(((DropDownList)(row.Cells[2].Controls[0])).SelectedItem);

讓您的手機號碼，編號FO r單元格從零開始，因此在您的代碼中，DropDownList6將爲2。

請檢查並確認它是否工作！

來源

2013-08-02 10:13:10

錯誤::: {「無法將類型爲「System.Web.UI.LiteralControl」的對象轉換爲鍵入「System.Web.UI.WebControls.DropDownList」。「} – CodeXerox

爲什麼控制[0] ....？ – CodeXerox

是的，你有一個單元格中的兩個控件一個標籤和一個下拉！我的壞，所以你得到這個錯誤，控制[0]是，** O **告訴控制的位置。試試這個** String str = Convert.ToString（（（DropDownList）（row.Cells [2] .FindControl（「drpdwn6」）））。SelectedItem）; ** –

在編輯的GridView，下拉列表值不會在所選項目的可變

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