以编程方式添加用户控件不会创建它的子控件 [英] Programmatically added User Control does not create its child controls

问题描述

我在我的项目，我添加到页面编程在页面的Page_Load事件处理程序的用户控件（.ascx），像这样：

I have a user control (.ascx) in my project that I am adding to a page programmatically in the page's Page_Load event handler, like so:

Controls.Add(new MyProject.Controls.ControlWidget());
Databind();

当我试图从控制自身内部访问控件的子控件，它们不存在。

When I try to access the control's child controls from within the control itself, they do not exist.

public override void DataBind()
{
  myrepeater.DataSource = GetDataSource(); 
  // throws an exception because myrepeater is null

  base.DataBind();
}

我如何访问用户控件的子控件？我曾尝试加入EnsureChildControls（）调用我的DataBind（）重写，但似乎并没有发挥作用。

How do I access the user control's child controls? I have tried adding a call to EnsureChildControls() to my DataBind() override but that doesn't seem to make a difference.

推荐答案

您需要使用LoadControl加载它，不只是实例化类。 LoadControl没有神奇的幕后扳平的一切行动和实例化的前端。

You need to use LoadControl to load it, not just instantiate the class. LoadControl does "magic" behind the scenes to tie everything up and instantiate the front end.

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