Asp.Net单一控制渲染的AJAX调用 [英] Asp.Net single control render for AJAX calls

问题描述

我想实现类似的东西<一个href="http://weblogs.asp.net/scottgu/archive/2006/10/22/Tip_2F00_Trick_3A00_-Cool-UI-Templating-Technique-to-use-with-ASP.NET-AJAX-for-non_2D00_UpdatePanel-scenarios.aspx">this或此。

I'm trying to implement something similar to this or this.

我已经创建了一个用户控件，Web服务和Web方法返回控件的HTML渲染，通过jQuery执行Ajax调用。

I've created a user control, a web service and a web method to return the rendered html of the control, executing the ajax calls via jQuery.

一切工作正常，但如果我把东西在使用相对路径的用户控件（在我的情况与NavigateUrl =〜/ mypage.aspx的超链接）的相对路径的解析失败在我的开发服务器。

All works fine, but if I put something in the user control that uses a relative path (in my case an HyperLink with NavigateUrl="~/mypage.aspx") the resolution of relative path fails in my developing server.

我期待： 的http：//本地主机：999 / MyApp的/ mypage.aspx

不过，我得到： 的http：//本地主机：999 / mypage.aspx

失踪MyApp的......

Missing 'MyApp'...

我认为这个问题是在创建用于加载控件的页：

I think the problem is on the creation of the Page used to load the control:

Page page = new Page();
Control control = page.LoadControl(userControlVirtualPath);
page.Controls.Add(control);
...

但我不明白，为什么......

But I can't figure out why....

修改 仅仅是为了清楚

我的用户控件位于〜/ ASCX / mycontrol.ascx 并包含一个非常简单的结构：由现在只是一个与NavigateUrl像超链接〜/ mypage.aspx。 而mypage.aspx真正驻留在根目录下。

My user control is located at ~/ascx/mycontrol.ascx and contains a really simple structure: by now just an hyperlink with NavigateUrl like "~/mypage.aspx". And "mypage.aspx" really resides on the root.

然后我做了一个Web服务，返回阿贾克斯部分呈现的控制：

Then I've made up a web service to return to ajax the partial rendered control:

[ScriptService]
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class wsAsynch : System.Web.Services.WebService
{
    [WebMethod(EnableSession = true)]
    public string GetControl(int parma1, int param2)
    {
        /* ...do some stuff with params... */
        Page pageHolder = new Page();

        UserControl viewControl = (UserControl)pageHolder.LoadControl("~/ascx/mycontrol.ascx");
        Type viewControlType = viewControl.GetType();

        /* ...set control properties with reflection... */

        pageHolder.Controls.Add(viewControl);
        StringWriter output = new StringWriter();
        HttpContext.Current.Server.Execute(pageHolder, output, false);

        return output.ToString();
    }
}

的HTML是正确呈现，但超链接的NavigateUrl的相对路径不正确地解决了，因为当我从VS2008开发服务器执行的项目，我的应用程序的根目录是

The html is correctly rendered, but the relative path in the NavigateUrl of hyperlink is incorrectly resolved, because when I execute the project from developing server of VS2008, the root of my application is

的http：//本地主机：999 / MyApp的/

和它的罚款，但NavigateUrl被解析为

and it's fine, but the NavigateUrl is resolved as

的http：//本地主机：999 / mypage.aspx

不失/ MyApp的/。 当然，如果我把，而不是在WS使用的pageHolder比如我的ascx在真实的页面，一切工作正常。

losing /MyApp/ . Of Course if I put my ascx in a real page, instead of the pageHolder instance used in the ws, all works fine.

另一个奇怪的事情是，如果我设置了 hl.NavigateUrl = Page.ResolveUrl（〜/ mypage.aspx）我得到的网页的正确网址： 的http：//本地主机：999 / MyApp的/ mypage.aspx

Another strange thing is that if I set the hl.NavigateUrl = Page.ResolveUrl("~/mypage.aspx") I get the correct url of the page: http://localhost:999/MyApp/mypage.aspx

和现在我会做到这一点，但我能理解为什么它不以正常的方式工作。 你知道吗？

And by now I'll do that, but I would understand WHY it doesn't work in the normal way. Any idea?

推荐答案

问题是，页面级不intented的实例就是这样。如果我们火了反射，我们很快就会看到，Asp.Net内部实例化一个Page类的返回它作为一个的IHttpHandler后设置的一个重要属性。你将不得不设置鸭prelativeTemplateSourceDirectory。这是存在于Control类的属性，并在内部它设置这是由例如超链接的链接解析正确的URL为〜的TemplateControlVirtualDirectory属性。

The problem is that the Page-class is not intented for instantiating just like that. If we fire up Reflector we'll quickly see that the Asp.Net internals sets an important property after instantiating a Page class an returning it as a IHttpHandler. You would have to set AppRelativeTemplateSourceDirectory. This is a property that exists on the Control class and internally it sets the TemplateControlVirtualDirectory property which is used by for instance HyperLink to resolve the correct url for "~" in a link.

其重要的是你设置这个值调用LoadControl方法之前，因为鸭prelativeTemplateSourceDirectory值上通过你的主人控件创建控件通过。

Its important that you set this value before calling the LoadControl method, since the value of AppRelativeTemplateSourceDirectory is passed on to the controls created by your "master" control.

如何获取正确的值在你的属性设置？使用静态AppDomainAppVirtualPath上的httpRuntime类。洙，概括起来讲...这应该工作;

How to obtain the correct value to set on your property? Use the static AppDomainAppVirtualPath on the HttpRuntime class. Soo, to sum it up... this should work;

[WebMethod(EnableSession = true)]
public string GetControl(int parma1, int param2)
{
    /* ...do some stuff with params... */
    var pageHolder = new Page() { AppRelativeTemplateSourceDirectory = HttpRuntime.AppDomainAppVirtualPath };

    var viewControl = (UserControl)pageHolder.LoadControl("~/ascx/mycontrol.ascx");
    var viewControlType = viewControl.GetType();

    /* ...set control properties with reflection... */

    pageHolder.Controls.Add(viewControl);
    var output = new StringWriter();
    HttpContext.Current.Server.Execute(pageHolder, output, false);

    return output.ToString();
}

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