Question

我正按照之前的要求做this。我发现的唯一区别是上面代码中包含的附加List项。

我尝试使用AppendDataBoundItems=true，但它仍无效。我还想将其默认值设置为itemtemplate标签中显示的值，即DropDownList的SelectedValue='<%# Eval("DepartmentName") %>'，但是我在下拉列表中无法使用该属性。可能是什么原因。 ??

<EditItemTemplate>
    <asp:DropDownList ID="ddlDepartment_Edit" runat="server" 
        DataSourceID="dsDepartment_Edit" DataTextField="DepartmentName" 
        DataValueField="PK_DepartmentId">
    </asp:DropDownList>
    <asp:SqlDataSource ID="dsDepartment_Edit" runat="server" 
        ConnectionString="<%$ ConnectionStrings:BlackHillsConnect %>"  
        ProviderName="System.Data.SqlClient" SelectCommand="sp_GetDepartmentDropDown" 
        SelectCommandType="StoredProcedure">
    </asp:SqlDataSource>                                 
</EditItemTemplate>
<ItemTemplate>
    <asp:Label ID="lblDepartmentName" runat="server" Text='<%# Eval("DepartmentName") %>' >
    </asp:Label>
</ItemTemplate>

我正在使用GridView

Answer 1

DataValueField似乎错了 - 不应该是DepartmentId吗？同样，您需要SelectedValue='<%# Eval("**DepartmentId**") %>' - DepartmentName为SeletectText。

Answer 2

使用GridView_DataBound事件处理程序可以解决问题。

在您的情况下，您需要添加HiddenField来存储PK_DepartmentId值：

<asp:GridView ID="gvExample" runat="server" AutoGenerateColumns="False" OnDataBound="gvExample_DataBound">
  <Columns>
    <asp:TemplateField HeaderText="Department">
      <EditItemTemplate>
        <asp:DropDownList ID="ddlDepartment_Edit" runat="server" DataSourceID="dsDepartment_Edit"
          DataTextField="DepartmentName" DataValueField="PK_DepartmentId">
        </asp:DropDownList>
        <asp:HiddenField ID="hfDepartmentId" runat="server" Value='<%# Bind("PK_DepartmentId") %>' />
        <asp:SqlDataSource ID="dsDepartment_Edit" runat="server" ConnectionString="<%$ ConnectionStrings:BlackHillsConnect %>"
          ProviderName="System.Data.SqlClient" SelectCommand="sp_GetDepartmentDropDown" SelectCommandType="StoredProcedure">
        </asp:SqlDataSource>
      </EditItemTemplate>
      <ItemTemplate>
        <asp:Label ID="lblDepartmentName" runat="server" Text='<%# Eval("DepartmentName") %>'>
        </asp:Label>
      </ItemTemplate>
    </asp:TemplateField>
    <asp:CommandField ShowEditButton="True" ButtonType="Button" />
  </Columns>
</asp:GridView>

protected void gvExample_DataBound(object sender, EventArgs e)
{
  foreach (GridViewRow gvRow in gvExample.Rows)
  {
    DropDownList ddlDepartment = gvRow.FindControl("ddlDepartment_Edit") as DropDownList;
    HiddenField hfDepartmentId = gvRow.FindControl("hfDepartmentId") as HiddenField;

    if (ddlDepartment != null && hfDepartmentId != null)
    {
      ddlDepartment.SelectedValue = hfDepartmentId.Value;
    }
  }
}

Answer 3

为什么你们建议使用循环，当有一个GridView方法专门用于行的条件改变时 - RowDataBound()？

protected void MyGridView_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            GridViewRow gvRow = (GridViewRow)e.Row;
            HiddenField hfAgentID = (HiddenField)gvRow.FindControl("hfAgentID");
            if (hfAgentID != null)
            {
                if (e.Row.RowType == DataControlRowType.DataRow)
                {
                    DropDownList ddlAgent = (DropDownList)gvRow.FindControl("ddlAgent");
                    ddlAgent.SelectedValue = hfAgentID.Value;
                }
            }
        }

Answer 4

在您的网格上有一个名为ItemCommand的事件。为它创建一个方法：

protected void Grid1_ItemCommand(object source, GridCommandEventArgs e)

现在只需创建一个case语句，该语句将识别用户何时单击网格上的编辑按钮：

 case Grid.EditCommandName:     
//set a member variable to the string of the cell you are editing.
//something like: mString = e.item..["Column"].toString();                  
                   break;

现在，在下拉列表被加载/预渲染之前，您已将成员变量设置为要选择的字符串。对OnPrerender使用事件OnLoad或dropdownbox，并将所选项目设置为此字符串。

Answer 5

这是我发现的最好的......

protected void GridView1_DataBound(object sender, EventArgs e)
{
    foreach (GridViewRow gvRow in GridView1.Rows)
    {
        RadioButtonList rbl = gvRow.FindControl("rblPromptType") as RadioButtonList;
        HiddenField hf = gvRow.FindControl("hidPromptType") as HiddenField;

        if (rbl != null && hf != null)
        {
            if (hf.Value != "")
            {
                //clear the default selection if there is one
                rbl.ClearSelection();
            }

            rbl.SelectedValue = hf.Value;
        }
    }
}

如何在GridView编辑模板中设置DropDownList的选定值

5 个答案: