我在我的 c# 项目中使用 Telerik 报告，使用他们的 REST 服务，我使用的是 R1 2017 版本，参数全部加载，并且数据库中各自的数据也加载，但是当我单击预览时，我收到此错误，
当我分析 Telerik DLL 时出现错误，这意味着参数值列表为空，但这不可能是因为我检查了网络日志，所有参数都被传递到 REST API。 这是我发送的有效负载
{"report":"Activity/Registered Users Report.trdp/VisionReport","parameterValues":{"CPR":"353464654","EMAIL":"","MOBILE":"","FromDate":"2023-12-31T00:00:00.000Z","ToDate":"2024-01-01T00:00:00.000Z","ChannelId":["006","002","005"]}}
到此 Telerik URL：
https://localhost:44302/api/reports/clients/aaf42228070/instances
当我在本地环境中运行相同的代码并报告时，它运行正常。不过，当我将代码部署到服务器时，我收到此错误，我在服务器上的 Telerik Designer 上运行了报告，它也加载得很好，只有当我在服务器上的浏览器中加载它时才会出现问题。 以下是我从 Telerik 收到的完整错误。
{message: "An error has occurred.", exceptionMessage: "Value cannot be null. ↵Parameter name: source",…}
exceptionMessage
:
"Value cannot be null.\r\nParameter name: source"
exceptionType
:
"System.ArgumentNullException"
message
:
"An error has occurred."
stackTrace
:
" at System.Linq.Enumerable.Select[TSource,TResult](IEnumerable`1 source, Func`2 selector)\r\n
at Telerik.Reporting.Services.Engine.PersistableCollection`1.GetEnumerator()\r\n
at Telerik.Reporting.Services.Engine.KeyItemPersistableCollection`2.ResolveItem(K referredInstanceKey, Boolean& newItem)\r\n
at Telerik.Reporting.Services.Engine.ReportEngine.CreateReportInstance(String clientID, String report, Dictionary`2 parameterValues)\r\n
at Telerik.Reporting.Services.WebApi.ReportsControllerBase.CreateInstance(String clientID, ClientReportSource reportSource)\r\n
at lambda_method(Closure , Object , Object[] )\r\n
at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass6_1.<GetExecutor>b__3(Object instance, Object[] methodParameters)\r\n
at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)\r\n--- End of stack trace from previous location where exception was thrown ---\r\n
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n
at System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__1.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n
at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__5.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n
at System.Web.Http.Filters.AuthorizationFilterAttribute.<ExecuteAuthorizationFilterAsyncCore>d__3.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n
at System.Web.Http.Controllers.ExceptionFilterResult.<ExecuteAsync>d__6.MoveNext()"
该异常似乎与报告 REST 服务的存储有关。我假设您使用 FileStorage，因为我已经看到这种存储类型存在此问题。这可能是由于某些第三方软件（防病毒、备份工具等）锁定了经常访问的文件。
堆栈跟踪显示枚举存储集合时引发异常。您可以使用File Locksmith之类的工具来查看谁锁定了服务存储的文件夹。
一般来说，Telerik 不建议将 FileStorage 用于生产目的。它不可靠主要是由于锁定机制效率低下。 MSSQL 或 Redis 存储选项要好得多。
这些 Telerik Reporting 资源也可能有用：