如何触发datagrid中的dropdownlist的SelectedIndexChanged事件，用VB怎么写代码？谢谢！

snowshaken 2009-01-06 02:01:49

datagrid中的编辑模板列中有个dropdownlist控件，并且已经绑定了数据，我想选择下拉框中某项数据时，能够触发SelectedIndexChanged事件，请问前台和后台的代码怎么写？
谢谢！

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ReyZhang 2009-01-07

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顶4楼

showlie 2009-01-07

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简单的一个事例，数据库引用northwind，主要功能是在gridview_category表中有dropdownlist模板列，其中表示产品的分类。第二个表是dropdownlist选中的分类的产品清单。具体代码如下，已通过测试，可安全使用，无毒无副作用：



<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">



<html xmlns="http://www.w3.org/1999/xhtml" >

<head runat="server">

    <title>无标题页</title>

</head>

<body>

    <form id="form1" runat="server">

        <div>

            <asp:GridView ID="GridView_category" AutoGenerateColumns="false" Width="200" runat="server"

                OnRowDataBound="GridView_category_RowDataBound">

                <Columns>

                    <asp:TemplateField>

                        <ItemTemplate>

                            <asp:DropDownList ID="DropDownList_category" Width="150" AutoPostBack="true" OnSelectedIndexChanged="DropDownList_category_SelectedIndexChanged" runat="server">

                            </asp:DropDownList></ItemTemplate>

                    </asp:TemplateField>

                </Columns>

            </asp:GridView>

            <asp:GridView ID="GridView_product" AutoGenerateColumns="false" Width="200" runat="server">

                <Columns>

                    <asp:BoundField HeaderText="产品编号" DataField="ProductId" />

                    <asp:BoundField HeaderText="产品名称" DataField="ProductName" />

                </Columns>

            </asp:GridView>

             

        </div>

    </form>

</body>

</html>



using System;

using System.Data;

using System.Configuration;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.Data;

using System.Data.SqlClient;



public partial class _Default : System.Web.UI.Page 

{

    protected void Page_Load(object sender, EventArgs e)

    {

        if (!Page.IsPostBack)

        {

            this.GridView_category.DataSource = GetCategory();

            this.GridView_category.DataBind();

        }

    }

    protected void GridView_category_RowDataBound(object sender, GridViewRowEventArgs e)

    {

        if (e.Row.RowType == DataControlRowType.DataRow)

        {

            DropDownList DropDownList_category = e.Row.Cells[0].FindControl("DropDownList_category") as DropDownList;

            if (DropDownList_category != null)

            {

                DropDownList_category.DataValueField = "CategoryId";

                DropDownList_category.DataTextField = "CategoryName";

                DropDownList_category.DataSource = GetCategory();

                DropDownList_category.DataBind();

            }

        }

    }

    protected void DropDownList_category_SelectedIndexChanged(object sender, EventArgs e)

    {

        DropDownList DropDownList_category = sender as DropDownList;

        string categoryId = DropDownList_category.SelectedValue;

        if (!string.IsNullOrEmpty(categoryId))

        {

            this.GridView_product.DataSource = GetProduct(categoryId);

            this.GridView_product.DataBind();

        }

    }



    private DataTable GetCategory()

    {

        string strConnection = "Data Source=(local);Initial Catalog=Northwind;Persist Security Info=True;User ID=sa";

        string strSelect = "select CategoryId,CategoryName from Categories";

        SqlDataAdapter da = new SqlDataAdapter(strSelect, strConnection);

        DataTable table = new DataTable();

        try

        {

            da.Fill(table);

        }

        catch (Exception e)

        {

            throw new Exception(e.Message);

        }

        return table;

    }



    private DataTable GetProduct(string categoryId)

    {

        string strConnection = "Data Source=(local);Initial Catalog=Northwind;Persist Security Info=True;User ID=sa";

        string strSelect = "select ProductId,ProductName from Products where CategoryId="+categoryId;

        SqlDataAdapter da = new SqlDataAdapter(strSelect, strConnection);

        DataTable table = new DataTable();

        try

        {

            da.Fill(table);

        }

        catch (Exception e)

        {

            throw new Exception(e.Message);

        }

        return table;

    }

}

阿彪兄 2009-01-06

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用到FindControl方法,同时要用到事件发生源(DropDownlist)sender

baobei7758 2009-01-06

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如果 SelectedIndexChanged 只是做一个简单的查询

建议用ajax 这样避免 datagrid的再次绑定和页面的刷新~

baobei7758 2009-01-06

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<asp:TemplateColumn HeaderText="发布周期">
<HeaderStyle Wrap="False"></HeaderStyle>
<ItemTemplate>
<asp:Label id=Label2 runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.发布周期") %>'>
</asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList id="zqddl" runat="server" AutoPostBack="True" OnSelectedIndexChanged="zqddl_SelectedIndexChanged"></asp:DropDownList>
</EditItemTemplate>
</asp:TemplateColumn>



	public void zqddl_SelectedIndexChanged(object sender, System.EventArgs e)

		{

			DropDownList ggddl =(DropDownList)this.datagrid.Items[datagrid.EditItemIndex].FindControl("zqddl");

		        //........

               }