我正在使用 OWIN 和 OpenIDConnect 针对 Azure AD 测试一个 Web 项目。我正在使用此示例中的大部分代码:https://github.com/Azure-Samples/active-directory-dotnet-webapp-webapi-openidconnect
我遇到一个问题,在该文件的第 27 行出现空异常:https://github.com/Azure-Samples/active-directory-dotnet-webapp-webapi-openidconnect/blob/master/TodoListWebApp/Utils/NaiveSessionCache.cs
我收到异常是因为 HttpContext.Current 为 null。
我可以看到 Load() 是从 BeforeAccessNotification() 调用的。
我的框架版本是4.5.2,我有<httpRuntime targetFramework="4.5.2" ... >
在我的 web.config 中。
为什么在此上下文中 HttpContext.Current 为 null?
Updated:
我与示例的唯一区别是控制器上的 ActionResult 不是异步的。
我在异步任务中调用 AcquireTokenSilentAsync,该任务是通过标准 ActionResult 中的 .Wait() 调用的。
我正在一个不允许我使用异步 ActionResults 的 CMS 中工作。
这是 OnAuthorizationCodeReceived:
private async Task OnAuthorizationCodeReceived(AuthorizationCodeReceivedNotification context)
{
var code = context.Code;
var credential = new ClientCredential(ClientId, AppKey);
var userObjectID =
context.AuthenticationTicket.Identity.FindFirst(
"http://schemas.microsoft.com/identity/claims/objectidentifier").Value;
var authContext = new AuthenticationContext(Authority, new NaiveSessionCache(userObjectID));
var uri = new Uri(HttpContext.Current.Request.Url.GetLeftPart(UriPartial.Path));
var result = await authContext.AcquireTokenByAuthorizationCodeAsync(code, uri, credential, GraphUrl);
}
这是堆栈跟踪:
[NullReferenceException: Object reference not set to an instance of an object.]
MyTest.NaiveSessionCache.Load() in C:\Workspace\MyTest\src\Website\NaiveSessionCache.cs:26
MyTest.NaiveSessionCache.BeforeAccessNotification(TokenCacheNotificationArgs args) in C:\Workspace\MyTest\src\Website\NaiveSessionCache.cs:53
Microsoft.IdentityModel.Clients.ActiveDirectory.TokenCache.OnBeforeAccess(TokenCacheNotificationArgs args) +94
Microsoft.IdentityModel.Clients.ActiveDirectory.<RunAsync>d__55.MoveNext() +3751
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +14139120
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +62
Microsoft.IdentityModel.Clients.ActiveDirectory.<AcquireTokenByAuthorizationCodeCommonAsync>d__48.MoveNext() +479
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +14139120
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +62
Microsoft.IdentityModel.Clients.ActiveDirectory.<AcquireTokenByAuthorizationCodeAsync>d__30.MoveNext() +386
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +14139120
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +62
System.Runtime.CompilerServices.TaskAwaiter`1.GetResult() +31
MyTest.<OnAuthorizationCodeReceived>d__12.MoveNext() in C:\Workspace\MyTest\src\Website\Startup.cs:86
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +14139120
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +62
System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task) +14139265
Microsoft.Owin.Security.OpenIdConnect.<AuthenticateCoreAsync>d__1a.MoveNext() +5965
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() +31
Microsoft.Owin.Security.OpenIdConnect.<AuthenticateCoreAsync>d__1a.MoveNext() +7305
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +14139120
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +62
Microsoft.Owin.Security.Infrastructure.<BaseInitializeAsync>d__0.MoveNext() +824
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +14139120
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +62
Microsoft.Owin.Security.Infrastructure.<Invoke>d__0.MoveNext() +334
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +14139120
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +62
Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.<RunApp>d__5.MoveNext() +204
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +14139120
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +62
Microsoft.Owin.Security.Infrastructure.<Invoke>d__0.MoveNext() +777
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +14139120
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +62
Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.<RunApp>d__5.MoveNext() +204
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +14139120
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +62
Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.<DoFinalWork>d__2.MoveNext() +194
Microsoft.Owin.Host.SystemWeb.IntegratedPipeline.StageAsyncResult.End(IAsyncResult ar) +96
System.Web.AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +363
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +157