BuildManager.CreateInstanceFromVirtualPath返回空值

Question

爲什麼顯示的值爲null

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

_virtualPath的值是 '〜/ RegisterUser.aspx' 字符串類型的

Answer 1

在你的頁面的代碼隱藏繼承自顯示示例：

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) 
    { 

    } 
}