回发不适用于 ASP.NET 路由(视图状态 MAC 验证失败) [英] Postback not working with ASP.NET Routing (Validation of viewstate MAC failed)

问题描述

我将 ASP.NET 3.5 SP1 System.Web.Routing 与经典的 WebForms 一起使用，如 http://chriscavanagh.wordpress.com/2008/04/25/systemwebrouting-with-webforms-sample/

I'm using the ASP.NET 3.5 SP1 System.Web.Routing with classic WebForms, as described in http://chriscavanagh.wordpress.com/2008/04/25/systemwebrouting-with-webforms-sample/

一切正常，我有自定义的 SEO 网址，甚至回发也有效.但有一种情况，回发总是失败，我得到一个:

All works fine, I have custom SEO urls and even the postback works. But there is a case where the postback always fails and I get a:

viewstate MAC 验证失败.如果此应用程序由 Web Farm 或集群托管，请确保配置指定相同的 validationKey 和验证算法.AutoGenerate 不能在集群中使用.

这里是重现错误的场景:

Here is the scenario to reproduce the error:

1. 使用按钮创建标准网络表单 mypage.aspx
2. 创建一个将a/b/{id}"映射到~/mypage.aspx"的路由
3. 执行站点时，可以导航http://localhost:XXXX/a/b/something 页面有效.但是当您按下按钮时，您会收到错误消息.当路由只是a/{id}"时不会发生错误.

1. Create a standard webform mypage.aspx with a button
2. Create a Route that maps "a/b/{id}" to "~/mypage.aspx"
3. When you execute the site, you can navigate http://localhost:XXXX/a/b/something the page works. But when you press the button you get the error. The error doen't happen when the Route is just "a/{id}".

好像和url中子路径的数量有关.如果至少有 2 个子路径，则视图状态验证失败.

It seems to be related to the number of sub-paths in the url. If there are at least 2 sub-paths the viewstate validation fails.

即使使用 EnableViewStateMac="false" 也会出现错误.

You get the error even with EnableViewStateMac="false".

有什么想法吗?是bug吗?

Any ideas? Is it a bug?

谢谢

推荐答案

我通过让我的视图用户控件继承自此类而不是 ViewUserControl(它是一种补丁渲染视图).它对我有用，希望对你也有用.

I worked around this by having my view user control inherit from this class instead of ViewUserControl<T> (it's kind of a patch for RenderView). It did the trick for me, hopefully it works for you too.

public class ViewUserControlWithoutViewState<T> : ViewUserControl<T> where T : class {
    protected override void LoadViewState(object savedState) {}

    protected override object SaveControlState() {
        return null;
    }

    protected override void LoadControlState(object savedState) {}

    protected override object SaveViewState() {
        return null;
    }

    /// <summary>
    /// extracted from System.Web.Mvc.ViewUserControl
    /// </summary>
    /// <param name="viewContext"></param>
    public override void RenderView(ViewContext viewContext) {
        viewContext.HttpContext.Response.Cache.SetExpires(DateTime.Now);
        var containerPage = new ViewUserControlContainerPage(this);
        ID = Guid.NewGuid().ToString();
        RenderViewAndRestoreContentType(containerPage, viewContext);
    }

    /// <summary>
    /// extracted from System.Web.Mvc.ViewUserControl
    /// </summary>
    /// <param name="containerPage"></param>
    /// <param name="viewContext"></param>
    public static void RenderViewAndRestoreContentType(ViewPage containerPage, ViewContext viewContext) {
        string contentType = viewContext.HttpContext.Response.ContentType;
        containerPage.RenderView(viewContext);
        viewContext.HttpContext.Response.ContentType = contentType;
    }

    /// <summary>
    /// Extracted from System.Web.Mvc.ViewUserControl+ViewUserControlContainerPage
    /// </summary>
    private sealed class ViewUserControlContainerPage : ViewPage {
        // Methods
        public ViewUserControlContainerPage(ViewUserControl userControl) {
            Controls.Add(userControl);
            EnableViewState = false;
        }

        protected override object LoadPageStateFromPersistenceMedium() {
            return null;
        }

        protected override void SavePageStateToPersistenceMedium(object state) {}
    }
}

我写过关于这个的博客.

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