ASP.NET Render 概要

在ASP.NET的生命周期走到Render阶段，Page.ProcessMain方法会调用Page的RenderControl方法，RenderControl方法会调用RenderControlInternal,RenderControlInternal根据该空间否是有ControlAdapter调用不同的呈现方法。RenderControlInternal的方法原型如下：

    private void RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
    {
      if (adapter != null)
      {
        adapter.BeginRender(writer);
        adapter.Render(writer);
        adapter.EndRender(writer);
      }
      else
      {
        this.Render(writer);
      }
    }

默认情况下会执行到Page类的Render方法。

 剩下的过程如下:

Page.Render--->Control.Render--->Control.RenderChildren--->Control.RenderChildrenInternal --->control.RenderControl--->Control.RenderControlInternal.

RenderChildrenInternal的方法原型如下： 

     internal void RenderChildrenInternal(HtmlTextWriter writer, ICollection children)

    {
      if ((this.RareFields != null) && (this.RareFields.RenderMethod != null))
      {
        writer.BeginRender();
        this.RareFields.RenderMethod(writer, this);
        writer.EndRender();
      }
      else if (children != null)
      {
        foreach (Control control in children)
        {
          control.RenderControl(writer);
        }
      }
    }

Remark:

In the method of  RenderChildrenInternal,the argument children with type IConllection will be circulated,to invoke t every control's RenderControl Method.