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我有这必将XmlDataSources一个FormView内一个DropDownList:
<asp:FormView ID="MyFormView" runat="server" DataSourceID="MyXmlDataSource">
<ItemTemplate>
<h1><%# XPath("SomeNode")%></h1>
<asp:Label ID="MyLabel" runat="server" AssociatedControlID="MyDdl" Text='<%# XPath("SomeOtherNode")%>' />
<asp:DropDownList ID="MyDdl"
runat="server"
DataSourceID="MyDdlDataSource"
DataTextField="name"
DataValueField="value"
AutoPostBack="true"
OnSelectedIndexChanged="MyDdl_SelectedIndexChanged">
</asp:DropDownList>
</ItemTemplate>
</asp:FormView>
<asp:XmlDataSource ID="MyXmlDataSource" runat="server" XPath="Root/MainSection" />
<asp:XmlDataSource ID="MyDdlDataSource" runat="server" XPath="Root/MainSection/Areas/*" />
在页面的代码隐藏,我有以下的OnLoad()方法,以及用于当所述下拉列表的选择指数的方法变化:
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
if (!IsPostBack)
{
string xml = GetMyXml(0); // default value
MyXmlDataSource.Data = xml;
MyDdlDataSource.Data = xml;
}
}
protected void MyDdl_SelectedIndexChanged(object sender, EventArgs e)
{
DropDownList l_MyDdl = FindControl("MyDdl") as DropDownList;
int myVal;
if (l_MyDdl != null)
if (!Int32.TryParse(l_MyDdl.SelectedItem.Value, out myVal))
myVal = 0;
string xml = GetMyXml(myVal);
MyXmlDataSource.Data = xml;
MyDdlDataSource.Data = xml;
}
当不同的值,从下拉列表中选择的SelectedIndexChanged被调用时,我无法获得下拉列表中的值(的FindControl始终返回null),以便用它来重新绑定数据源。我怎样才能得到这个价值?
这很漂亮。谢谢 :) – Bullines 2008-12-10 23:32:04