我FormView
的页面标记中有:
<asp:FormView ruanat="server" ID="FormView1" DataSourceID="SqlDataSource1" OnDataBinding="FormView1_DataBinding" OnDataBound="FormView1_DataBound">
<InsertItemTemplate>
<uc:UserControl1 runat="server" ID="ucUserControl1" />
</InsertItemTemplate>
</asp:FormView>
<asp:SqlDataSource runat="server" ID="SqlDataSource1" SelectCommand="EXEC someSP" />
它的代码隐藏WAS:
protected void FormView1_DataBound(object sender, EventArgs e)
{
var c = FormView1.FindControl("ucUserControl1"); // returns null
}
成为:
protected void FormView1_DataBinding(object sender, EventArgs e)
{
FormView1.ChangeMode(FormViewMode.Insert);
}
protected void FormView1_DataBound(object sender, EventArgs e)
{
if (FormView1.CurrentMode = FormViewMode.Insert)
{
var c = FormView1.FindControl("ucUserControl1"); // returns null no more!
}
}
从理论上讲,我能够在FormView
数据绑定后找到控制权。但我不是。为什么?