与ObjectDataSource的DropDownList中的C＃的SelectedValue [英] C# selectedvalue of dropdownlist with ObjectDataSource

问题描述

如何设置的DropDownList的SelectedValue的，如果DropDownList的是
的GridView内的DropDownList被填充的ObjectDataSource单击编辑
按钮时？

How do i set selectedvalue of dropdownlist if dropdownlist is within Gridview and dropdownlist is populated by objectdatasource when EDIT button is clicked?

发生在我的应用是DropDownList中被填充
，而第一项始终显示为SelectedValue的。

What happens to my app is dropdownlist gets populated but the first item always shows up as selectedvalue.

推荐答案

标记：

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="Id" DataSourceID="ObjectDataSource1" OnRowDataBound="GridView1_RowDataBound">
        <Columns>
            <asp:CommandField ShowEditButton="True" />
            <asp:CommandField ShowSelectButton="True" />
            <asp:BoundField DataField="Id" HeaderText="Id" SortExpression="Id" />
            <asp:BoundField DataField="Firstname" HeaderText="Firstname" SortExpression="Firstname" />
            <asp:BoundField DataField="Lastname" HeaderText="Lastname" SortExpression="Lastname" />
            <asp:TemplateField HeaderText="Age">
                   <ItemTemplate>
                       <%#Eval("Age") %>
                   </ItemTemplate>
                <EditItemTemplate>
                    <asp:DropDownList runat="server" ID="ddlAge">
                        <Items>
                            <asp:ListItem Text="10" Value="10"></asp:ListItem>
                            <asp:ListItem Text="20" Value="20"></asp:ListItem>
                            <asp:ListItem Text="30" Value="30"></asp:ListItem>
                            <asp:ListItem Text="40" Value="40"></asp:ListItem>
                            <asp:ListItem Text="50" Value="50"></asp:ListItem>
                            <asp:ListItem Text="60" Value="60"></asp:ListItem>
                            <asp:ListItem Text="70" Value="70"></asp:ListItem>
                            <asp:ListItem Text="80" Value="80"></asp:ListItem>
                            <asp:ListItem Text="90" Value="90"></asp:ListItem>
                        </Items>
                    </asp:DropDownList>
                </EditItemTemplate>
            </asp:TemplateField>
        </Columns>

    </asp:GridView>
    <asp:ObjectDataSource ID="ObjectDataSource1" runat="server" SelectMethod="GetAll" TypeName="OdsSelectedItem.App_Data.StudentsBll"></asp:ObjectDataSource>

代码：

Code:

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            Student item = e.Row.DataItem as Student;
            if (item != null)
            {
                var ddl = e.Row.FindControl("ddlAge") as DropDownList;
                if (ddl == null) return;
                ddl.SelectedValue = item.Age.ToString();
            }

        }
    }

坏榜样，但我认为它显示了正确的方向：）

poor example, but i think it shows into the right direction :)

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