MultiView as CompositeControl

Question

我想构建一个继承自System.Web.UI.WebControls.MultiView的服务器控件。

该控件将包含一组服务器控件，这些控件依次从System.Web.UI.WebControls.View继承。但是，当我向控件的View集合添加单个视图时，不会呈现任何内容......

public class WizardMultiview : System.Web.UI.WebControls.MultiView
{
    // field
    private WizardStart _start;

    override CreateChildControls()
    {
       this._start = new WizardStart(); // custom view
       this._start.ID = "WizardStart1";
       this.Views.Add(this._start);

       this.ActiveViewIndex = 0;
    }

    override Render(HtmlTextWriter writer)
    {
       // NOTE: at this point the control can't render itself.
    }

}

然后，在Default.aspx.cs中我做：

public void Page_Load(object sender, EventArgs e)
{
    My.Controls.WizardMultiview view = new My.Controls.WizardMultiview();
    this.Panel1.Controls.Add(view); // this is a Panel on the Default.aspx page
}

自定义View控件如下所示：

public class WizardStart : System.Web.UI.WebControls.View
{
    override Render(HtmlTextWriter writer)
    {
        writer.WriteLine("I am the starting point");
    }
}

当我将此控件添加到ASPX页面时，没有任何反应。但是，如果我创建一个MultiView，并将MultiView添加到CompositeControl的Control Collection并将视图添加到此MultiView，它可以正常工作吗？我确定我想要实现的目标是什么？