Non-static method requires a target

Question

I have a controller action that works fine on Firefox both locally and in production  and IE locally  but not IE in production   Here is my controller action   public ActionResult MNPurchase         CalculationViewModel calculationViewModel    CalculationViewModel TempData  calculationViewModel         decimal OP   landTitleUnitOfWork Sales Find            Where x   gt  x Min  gt   calculationViewModel SalesPrice           FirstOrDefault            OP       decimal MP   landTitleUnitOfWork Sales Find            Where x   gt  x Min  gt   calculationViewModel MortgageAmount           FirstOrDefault            MP       calculationViewModel LoanAmount    OP   100  - MP      calculationViewModel LendersTitleInsurance    calculationViewModel LoanAmount   850        return View calculationViewModel       Here is the stack trace I get in IE      Error        An error occurred while processing your request        System Reflection TargetException  Non-static method requires a target  at    System Reflection RuntimeMethodInfo CheckConsistency Object target  at    System Reflection RuntimeMethodInfo InvokeArgumentsCheck Object obj  BindingFlags    invokeAttr  Binder binder  Object   parameters  CultureInfo culture  at    System Reflection RuntimeMethodInfo Invoke Object obj  BindingFlags invokeAttr  Binder    binder  Object   parameters  CultureInfo culture  at    System Reflection RuntimePropertyInfo GetValue Object obj  Object   index  at    System Data Objects ELinq QueryParameterExpression TryGetFieldOrPropertyValue MemberExpression me  Object instance  Object amp  memberValue  at    System Data Objects ELinq QueryParameterExpression TryEvaluatePath Expression expression  ConstantExpression amp  constantExpression  at    System Data Objects ELinq QueryParameterExpression EvaluateParameter Object   arguments     at System Data Objects ELinq ELinqQueryState GetExecutionPlan Nullable1 forMergeOption     at System Data Objects ObjectQuery1 GetResults Nullable1 forMergeOption  at    System Data Objects ObjectQuery1 System Collections Generic IEnumerable GetEnumerator      at System Linq Enumerable FirstOrDefault TSource  IEnumerable1 source  at    System Linq Queryable FirstOrDefault TSource  IQueryable1 source  at    LandTitle Controllers HomeController MNRefi   at lambda method Closure   ControllerBase      Object     at System Web Mvc ReflectedActionDescriptor Execute ControllerContext    controllerContext  IDictionary2 parameters  at    System Web Mvc ControllerActionInvoker InvokeActionMethod ControllerContext    controllerContext  ActionDescriptor actionDescriptor  IDictionary2 parameters  at    Castle Proxies Invocations ControllerActionInvoker InvokeActionMethod InvokeMethodOnTarget   at Castle DynamicProxy AbstractInvocation Proceed   at    Glimpse Mvc3 Interceptor InvokeActionMethodInterceptor Intercept IInvocation invocation  at Castle DynamicProxy AbstractInvocation Proceed   at    Castle Proxies AsyncControllerActionInvokerProxy InvokeActionMethod ControllerContext controllerContext  ActionDescriptor actionDescriptor  IDictionary  2 parameters  at    System Web Mvc Async AsyncControllerActionInvoker  lt  c  DisplayClass37  lt  c  DisplayClass39 b  33   at    System Web Mvc Async AsyncControllerActionInvoker  lt  c  DisplayClass4f b  49   at    System Web Mvc Async AsyncControllerActionInvoker  lt  c  DisplayClass37 b  36 IAsyncResult asyncResult  at    System Web Mvc Async AsyncControllerActionInvoker  lt  c  DisplayClass25  lt  c  DisplayClass2a b  20   at System Web Mvc Async AsyncControllerActionInvoker  lt  c  DisplayClass25 b  22 IAsyncResult asyncResult

User · Answer

I face this error on testing WebAPI in Postman tool.

After building the code, If we remove any line (For Example: In my case when I remove one Commented line this error was occur...) in debugging mode then the "Non-static method requires a target" error will occur.

Again, I tried to send the same request. This time code working properly. And I get the response properly in Postman.

I hope it will use to someone...

User · Answer

All the answers are pointing to a Lambda expression with an NRE  Null Reference Exception    I have found that it also occurs when using Linq to Entities   I thought it would be helpful to point out that this exception is not limited to just an NRE inside a Lambda expression

User · Answer

I think this confusing exception occurs when you use a variable in a lambda which is a null-reference at run-time  In your case  I would check if your variable calculationViewModel is a null-reference   Something like   public ActionResult MNPurchase         CalculationViewModel calculationViewModel    CalculationViewModel TempData  calculationViewModel         if  calculationViewModel    null                decimal OP   landTitleUnitOfWork Sales Find                Where x   gt  x Min  gt   calculationViewModel SalesPrice               FirstOrDefault                OP           decimal MP   landTitleUnitOfWork Sales Find                Where x   gt  x Min  gt   calculationViewModel MortgageAmount               FirstOrDefault                MP           calculationViewModel LoanAmount    OP   100  - MP          calculationViewModel LendersTitleInsurance    calculationViewModel LoanAmount   850            return View calculationViewModel             else                  Do something else

User · Answer

I ve found this issue to be prevalent in Entity Framework when we instantiate an Entity manually rather than through DBContext which will resolve all the Navigation Properties  If there are Foreign Key references  Navigation Properties  between tables and you use those references in your lambda  e g  ProductDetail Products ID  then that  Products  context remains null if you manually created the Entity

User · Answer

This could happen if you are using reflection to GetProperty of an object which is null

User · Answer

Normally it happens when the target is null  So better check the invoke target first then do the linq query

[c#] Non-static method requires a target

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