[英]How to find control with in repeater on button click event and repeater is placed with in gridview in asp.net C#
[英]Find Control in asp:repeater on button click event
我在asp:repeater项目模板中有一个下拉列表。 如何在按钮点击事件中获得其价值。
<asp:Repeater runat="server" ID="WorkflowListAfter" onitemcreated="WorkflowListAfterItemCreated">
<ItemTemplate>
<asp:DropDownList ID="ddlWorkflowMembers" runat="server" DataTextField="MemberName" DataValueField="MemberID">
</ItemTemplate>
</asp:Repeater>
protected DropDownList ddlWorkflowMembers = new DropDownList();
protected void WorkflowListAfterItemCreated(object sender, RepeaterItemEventArgs e)
{
ddlWorkflowMembers = (DropDownList) e.Item.FindControl("ddlWorkflowMembers");
}
protected void BtnSaveClick(object sender, EventArgs e) {
if (ddlWorkflowMembers.SelectedItem == null) return;
}
上面的代码是第一次工作,但在回发后ddlWorkflowMembers总是为null expersion。
假设BtnSave
也在转发器内部。
通过强制转换按钮的NamingContainer
获得RepeaterItem
。 然后,您可以使用FindControl
获取对DropDownList
的引用:
protected void BtnSaveClick(object sender, EventArgs e) {
var btn = (Button)sender;
var item = (RepeaterItem)btn.NamingContainer;
var ddl = (DropDownList) item.FindControl("ddlWorkflowMembers");
// ...
}
如果按钮位于转发器之外,并且您想要保存所有项目,则需要遍历所有项目:
protected void BtnSaveClick(object sender, EventArgs e) {
foreach(RepeaterItem item in WorkflowListAfter.Items)
{
var ddl = (DropDownList) item.FindControl("ddlWorkflowMembers");
// ...
}
}
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