BuildManager.CreateInstanceFromVirtualPath返回空值

Question

为什么显示的值为null

 public IHttpHandler GetHttpHandler(RequestContext requestContext)
{
    var display = BuildManager.CreateInstanceFromVirtualPath(
                    _virtualPath, typeof(Page)) as IDisplay;
    return display;
}

_virtualPath的值是字符串类型的'~/RegisterUser.aspx‘

Answer 1

在您的页面代码背后，从IDisplay示例继承：

using System.Web.UI;
using System.Web.UI.WebControls;

public partial class secondpage: System.Web.UI.Page, **IDisplay**     <--------------------
{
    protected void Page_Load(object sender, EventArgs e)
    {

    } 
}