Gridview DrowdownList selectedindexchanged not Firing [英] Gridview DrowdownList selectedindexchanged not Firing

问题描述

< asp：GridView runat =serverID =gridtest>

< columns> < asp：TemplateField>

< itemtemplate>

< asp：DropDownList ID =ddl_listrunat =serverAutoPostBack =trueEnableViewState =true

OnSelectedIndexChanged =ddl_list_SelectedIndexChanged>

< asp：ListItem Text =1Value =1> 1

< asp：ListItem Text =2Value =2> 2

< asp：ListItem Text =3Value =3> 3

<asp:GridView runat="server" ID="gridtest">
<columns> <asp:TemplateField>
<itemtemplate>
<asp:DropDownList ID="ddl_list" runat="server" AutoPostBack="true" EnableViewState="true"
OnSelectedIndexChanged="ddl_list_SelectedIndexChanged">
<asp:ListItem Text="1" Value="1">1
<asp:ListItem Text="2" Value="2">2
<asp:ListItem Text="3" Value="3">3

protected void Page_Load(object sender, EventArgs e)
   {
       SqlConnection con = new SqlConnection();
       con.ConnectionString = ConfigurationManager.AppSettings[ConnectionString"];
       if (!Page.IsPostBack)
       {
           con.Open();
           SqlCommand cmd = new SqlCommand("Select * from Mas_exporter;, con);
           cmd.ExecuteNonQuery();
           SqlDataAdapter da = new SqlDataAdapter();
           da = new SqlDataAdapter(cmd);
           DataSet ds = new DataSet();
           da.Fill(ds);
           gridtest.DataSource = ds;
           gridtest.DataBind();
       }

   }
   protected void ddl_list_SelectedIndexChanged(object sender, EventArgs e)
   {
       Response.Write("Success");
   }

这一个触发下拉列表正确选择了指数。但在我的情况下，我无法在PageLoad上绑定gridview。我将在按钮点击事件上绑定gridview。如果我在按钮Click事件上绑定Gridview，下拉列表selectedindexchange没有触发......我需要做什么？

This one firing dropdown selectedindexchange Correctly. But in my case i can't bind gridview on PageLoad. i will bind gridview on button click event. If i bind Gridview on button Click event , Drop downlist selectedindexchange didn't firing...what i need to do?

推荐答案

你能不能在页面中添加ispostback功能加载





protected void Page_Load（object sender，EventArgs e）

{

if（！ispostback）

{

SqlConnection con = new SqlConnection（）;

con.ConnectionString = ConfigurationManager.AppSettings [ConnectionString ];

if（！Page.IsPostBack）

{

con.Open（）;

SqlCommand cmd = new SqlCommand（Select * from Mas_exporter;，con）;

cmd.ExecuteNonQuery（）;

SqlDataAdapter da = new SqlDataAdapter（）;

da = new SqlDataAdapter（cmd）;

DataSet ds = new DataSet（）;

da.Fill（ds）;

gridtest .DataSource = ds;

gridtest.DataBind（）;

}

}



}

Could you please add ispostback function in page load


protected void Page_Load(object sender, EventArgs e)
{
if(!ispostback)
{
SqlConnection con = new SqlConnection();
con.ConnectionString = ConfigurationManager.AppSettings[ConnectionString"];
if (!Page.IsPostBack)
{
con.Open();
SqlCommand cmd = new SqlCommand("Select * from Mas_exporter;, con);
cmd.ExecuteNonQuery();
SqlDataAdapter da = new SqlDataAdapter();
da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
gridtest.DataSource = ds;
gridtest.DataBind();
}
}

}

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