Question

<asp:TemplateField HeaderText="Category">
    <InsertItemTemplate>
        <asp:DropDownList runat="server" 
             DataField="CategoryID" DataSourceID="SqlDataSource2" 
             DataTextField="Name" DataValueField="CategoryID">   
        </asp:DropDownList>
    </InsertItemTemplate>                            
</asp:TemplateField>

<asp:SqlDataSource ID="SqlDataSource2" runat="server" 
     ConnectionString="<%$ ConnectionStrings:DatabaseConnectionString1 %>" 
     SelectCommand="SELECT Name, CategoryID FROM [tblCategory]">  
</asp:SqlDataSource>

我正在尝试创建一个下拉列表，以提交所选字段的ID。只有提交表单后，我才能获得ID并在数据库中保留NULL值。

Answer 1

我认为您正在网格视图的OnRowUpdating方法中使用此下拉列表。

首先，您需要给下拉列表一个ID，例如

<asp:DropDownList ID="ddlCategory" runat="server" DataField="CategoryID" DataSourceID="SqlDataSource2" DataTextField="Name" DataValueField="CategoryID"> </asp:DropDownList>

然后，您将需要获取下拉参考，例如

protected void GridView_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
   DropDownList category = GridView.Rows[e.Row.RowIndex].FindControl("ddlCategory") as DropDownList;

   //then, use category to get Selected Value
   //like, category.SelectedValue
   // to submit your value to the database
}

ASP.NET从下拉列表选择中提交selectedValue

1 个答案: