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我有一个带有3个下拉框的ASPX页面，通过Infragistic控件。其中1个在UpdatePanel中，UpdatePanel的两个外部是通过AsynPostBack事件来控制第三个中显示的内容。 UpdatePanel外部的两个下拉框在后面的代码中调用相同的函数，但取决于我传递给它的对象，它会在第三个下拉框中显示某些内容。问题是，无论我选择哪个下拉框，函数似乎都会被触发两次，并且每次调用都将其控件传递给该函数，而第二个函数即使在单击第一个时也始终显示。我如何阻止？根据我选择的控制方式，我期待该功能仅触发一次。我也试图让每一个下拉框点到其自身的功能，仍然二者得到了触发....更新面板和事件触发两次
<td style="width:3px;"><asp:HiddenField ID="pnb_recno" runat="server" /></td>
<td style="width:100px;">Line Of Business:</td>
<td colspan="2" width="150px"><!--OnSelectionChanged="pnb_product_list"-->
<ig:WebDropDown ID="pnb_ddRgn" runat="server" Width="175px" DropDownContainerHeight="100px"
EnableDropDownAsChild="false" TextField="Name" DropDownContainerWidth="175px" Font-Size="11px"
StyleSetName="Windows7" OnSelectionChanged="pnb_product_list" AutoPostBack="true" ClientEvents-SelectionChanged="pnb_chgLOB" >
<Items>
<ig:DropDownItem Text="" Value="" />
<ig:DropDownItem Text="Global Client Access" Value="Global Client Access" />
<ig:DropDownItem Text="Solution Center" Value="Solution Center" />
<ig:DropDownItem Text="Both" Value="Both" />
</Items>
</ig:WebDropDown>
</td>
<td style="width:3px;"></td>
<td style="width:100px;">Problem Type:</td>
<td colspan="2" width="150px">
<ig:WebDropDown ID="pnb_ddPblmTyp" runat="server" Width="175px" DropDownContainerHeight="80px" EnableDropDownAsChild="false" TextField="Name" DropDownContainerWidth="175px" Font-Size="11px" StyleSetName="Windows7" AutoPostBack="true" OnSelectionChanged="pnb_product_list">
<Items>
<ig:DropDownItem Text="" Value="" />
<ig:DropDownItem Text="Infrustructure" Value="Infrustructure" />
<ig:DropDownItem Text="Products" Value="Products" />
</Items>
</ig:WebDropDown>
</td>
<td colspan="2" width="150px">
<asp:UpdatePanel ID="pnb_udtPnlPrdts" runat="server" UpdateMode="Conditional">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="pnb_ddRgn" EventName="SelectionChanged" />
<asp:AsyncPostBackTrigger ControlID="pnb_ddPblmTyp" EventName="SelectionChanged" />
</Triggers>
<ContentTemplate>
<ig:WebDropDown ID="pnb_ddPrdts" runat="server" Width="175px" EnableClosingDropDownOnSelect="false" TextField="ProductName" EnablePaging="false" DropDownContainerHeight="175px" EnableMultipleSelection="true" MultipleSelectionType="Checkbox" StyleSetName="Windows7" DisplayMode="DropDown">
<ClientEvents SelectionChanged="selectedIndexChanged" SelectionChanging="selectedIndexChanging" />
</ig:WebDropDown>
</ContentTemplate>
</asp:UpdatePanel>
</td>
protected void pnb_product_list(object sender, EventArgs e)
{
try
{
using (SqlConnection sqlConnection = new SqlConnection(connectionString))
{
using (SqlCommand sqlCommand = new SqlCommand("dbo.getDdProducts", sqlConnection))
{
sqlCommand.CommandTimeout = 0;
sqlCommand.CommandType = CommandType.StoredProcedure;
if (!String.IsNullOrEmpty(pnb_ddRgn.CurrentValue))
sqlCommand.Parameters.AddWithValue("@lob", pnb_ddRgn.CurrentValue);
else
sqlCommand.Parameters.AddWithValue("@alert_type", pnb_ddPblmTyp.CurrentValue);
using (DataTable dataTable = new DataTable())
{
using (SqlDataAdapter dataAdapter = new SqlDataAdapter(sqlCommand))
{
dataAdapter.Fill(dataTable);
}
pnb_ddPrdts.DataSource = dataTable;
pnb_ddPrdts.DataBind();
}
}
}
}
catch (Exception exception)
{
}
}