CanvasAuthorize 和 VerificationException

Question

我正在执行这段代码：

    [CanvasAuthorize(Permissions = "user_about_me")]
    public ActionResult About()
    {
        var fb = new FacebookWebClient();

        dynamic result = fb.Get("me");

        ViewData["Firstname"] = result.first_name;
        ViewData["Lastname"] = result.last_name;


        return View();
    }

我得到以下异常..有什么想法吗？

“/”应用程序中的服务器错误。

操作可能会破坏运行时的稳定性。 说明：执行当前 Web 请求期间发生未处理的异常。请查看堆栈跟踪以获取有关错误及其源自代码的位置的更多信息。

异常详细信息：System.Security.VerificationException：操作可能会破坏运行时的稳定性。

来源错误：

在执行当前 Web 请求期间生成了未处理的异常。可以使用下面的异常堆栈跟踪来识别有关异常起源和位置的信息。

堆栈跟踪：

[VerificationException：操作可能会破坏运行时的稳定性。] SimpleJson.SimpleJson.ParseValue(Char[] json, Int32& index, Boolean& success) +107 SimpleJson.SimpleJson.TryDeserializeObject(String json, Object& object) +212 SimpleJson.SimpleJson.DeserializeObject(String json) +84 Facebook.SimpleJsonSerializer.DeserializeObject（字符串 json）+112 Facebook.FacebookSignedRequest.TryParse(String secret, String signedRequestValue, Int32 maxAge, Double currentTime, Boolean throws) +3096 Facebook.FacebookSignedRequest.Parse（字符串秘密，字符串签名请求值）+445 Facebook.FacebookSignedRequest.GetSignedRequest(String appSecret, HttpContextBase httpContext) +931 Facebook.FacebookSession.GetSession(String appId, String appSecret, HttpContextBase httpContext, FacebookSignedRequest signedRequest) +1031 Facebook.FacebookSession.GetSession(String appId, String appSecret, HttpContextBase httpContext) +128 Facebook.Web.FacebookWebContext.get_Session() +317 Facebook.Web.FacebookWebContext.IsAuthenticated() +136 Facebook.Web.FacebookWebContext.IsAuthorized(String[] 权限) +186 Facebook.Web.Mvc.CanvasAuthorizeAttribute.OnAuthorization(AuthorizationContext filterContext, IFacebookApplication 设置) +572 Facebook.Web.Mvc.FacebookAuthorizeAttributeBase.OnAuthorization(AuthorizationContext filterContext) +182 System.Web.Mvc.ControllerActionInvoker.InvokeAuthorizationFilters（ControllerContext 控制器上下文，IList1 filters, ActionDescriptor actionDescriptor) +149 System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +831 System.Web.Mvc.Controller.ExecuteCore() +136 System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +233 System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) +39 System.Web.Mvc.<>c__DisplayClassb.<BeginProcessRequest>b__5() +68 System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +44 System.Web.Mvc.Async.<>c__DisplayClass81.b__7（IAsyncResult ）+42 System.Web.Mvc.Async.WrappedAsyncResult`1.End() +142 System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, 对象标签) +54 System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +40 System.Web.Mvc.c_DisplayClasse.b_d() +61 System.Web.Mvc.SecurityUtil.b_0（动作 f）+31 System.Web.Mvc.SecurityUtil.ProcessInApplicationTrust（动作动作）+56 System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +110 System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult 结果) +38 System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +690 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +194

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版本信息：Microsoft .NET Framework 版本：4.0.30319； ASP.NET 版本：4.0.30319.1 I

Answer 1

试试这个：

[CanvasAuthorize(Permissions = "user_about_me")]
public ActionResult About()
{
    CanvasAuthorizer auth = new CanvasAuthorizer();
    FacebookWebClient client = new FacebookWebClient(auth.FacebookWebRequest.Session.AccessToken);

    dynamic result = client.Get("me");

    ViewData["Firstname"] = result.first_name;
    ViewData["Lastname"] = result.last_name;


    return View();
}