的FindControl 将工作是即创建这些控件后，才将数据绑定到 FormView控件。所以，你需要使用的 FormView控件相应的事件这样的 ItemCreated 或数据绑定。例如，

FindControl will work only after those controls are created i.e when data is bound to the FormView. So you need to use appropriate event on FormView such ItemCreated or DataBound. For example,

protected void fvMediaIntro_ItemCreated(Object sender, EventArgs e)
{
   var control = fvMediaIntro.Row.FindControl("iNeedToFindThis") as HtmlAnchor;
}

假设，你在的Page_Load 绑定或使用标记，你也可以使用 prerender 父页/控制事件安全办的FindControl 。

Assuming, you are binding in page_load or using mark-up, you can also use prerender event of parent page/control safely to do FindControl.