Blazor Wasm Eval: System.InvalidOperationException: Operation is not valid due to the current state of the object.

[groogiam]

Here is what to include in your request to make sure we implement a solution as quickly as possible.

1. Description

Dynamic objects created by the library throw the following exception when accessing their properties in Blazor Wasm

2. Exception

If you are seeing an exception, include the full exception details (message and stack trace).

Exception message: Unhandled exception rendering component: Operation is not valid due to the current state of the object.
Stack trace: crit: Microsoft.AspNetCore.Components.WebAssembly.Rendering.WebAssemblyRenderer[100]
      Unhandled exception rendering component: Operation is not valid due to the current state of the object.
System.InvalidOperationException: Operation is not valid due to the current state of the object.
   at System.Reflection.Emit.RuntimeGenericTypeParameterBuilder.GetGenericParameterConstraints()
   at Microsoft.CSharp.RuntimeBinder.SymbolTable.AddAggregateToSymbolTable(NamespaceOrAggregateSymbol parent, Type type)
   at Microsoft.CSharp.RuntimeBinder.SymbolTable.LoadSymbolsFromType(Type type)
   at Microsoft.CSharp.RuntimeBinder.SymbolTable.GetCTypeFromType(Type type)
   at Microsoft.CSharp.RuntimeBinder.RuntimeBinder.GetArgumentType(ICSharpBinder p, CSharpArgumentInfo argInfo, Expression param, DynamicMetaObject arg, Int32 index)
   at Microsoft.CSharp.RuntimeBinder.RuntimeBinder.CreateArgumentArray(ICSharpBinder payload, Expression[] parameters, DynamicMetaObject[] args)
   at Microsoft.CSharp.RuntimeBinder.RuntimeBinder.BindCore(ICSharpBinder payload, Expression[] parameters, DynamicMetaObject[] args, DynamicMetaObject& deferredBinding)
   at Microsoft.CSharp.RuntimeBinder.RuntimeBinder.Bind(ICSharpBinder payload, Expression[] parameters, DynamicMetaObject[] args, DynamicMetaObject& deferredBinding)
   at Microsoft.CSharp.RuntimeBinder.BinderHelper.Bind(ICSharpBinder action, RuntimeBinder binder, DynamicMetaObject[] args, IEnumerable`1 arginfos, DynamicMetaObject onBindingError)
   at Microsoft.CSharp.RuntimeBinder.CSharpGetMemberBinder.FallbackGetMember(DynamicMetaObject target, DynamicMetaObject errorSuggestion)
   at System.Dynamic.DynamicObject.MetaDynamic.<>c.<BindGetMember>b__2_0(MetaDynamic this, GetMemberBinder b, DynamicMetaObject e)
   at System.Dynamic.DynamicObject.MetaDynamic.CallMethodWithResult[GetMemberBinder](MethodInfo method, GetMemberBinder binder, Expression[] args, Fallback`1 fallback, Fallback`1 fallbackInvoke)
   at System.Dynamic.DynamicObject.MetaDynamic.CallMethodWithResult[GetMemberBinder](MethodInfo method, GetMemberBinder binder, Expression[] args, Fallback`1 fallback)
   at System.Dynamic.DynamicObject.MetaDynamic.BindGetMember(GetMemberBinder binder)
   at System.Dynamic.GetMemberBinder.Bind(DynamicMetaObject target, DynamicMetaObject[] args)
   at System.Dynamic.DynamicMetaObjectBinder.Bind(Object[] args, ReadOnlyCollection`1 parameters, LabelTarget returnLabel)
   at System.Runtime.CompilerServices.CallSiteBinder.BindCore[Func`3](CallSite`1 site, Object[] args)
   at System.Dynamic.UpdateDelegates.UpdateAndExecute1[Object,Object](CallSite site, Object arg0)
   at WasmDynamicLinq.Pages.Home.OnInitialized() in D:\source\WasmDynamicLinq\Pages\Home.razor.cs:line 49
   at Microsoft.AspNetCore.Components.ComponentBase.RunInitAndSetParametersAsync()

3. Fiddle or Project

Run the home page to reproduce.
WasmDynamicLinq.zip

[StefH]

I did not check your example yet. Will do that at end of week.

---

Probably your issue is another issue as described here?

https://dynamic-linq.net/advanced-blazor-webassembly

[groogiam]

I had looked at this article prior to submitting the issue. This happens in debug mode and when I have the <BlazorWebAssemblyEnableLinking>false</BlazorWebAssemblyEnableLinking> property set in the project file. From my limited knowledge it did not seem like the same issue. I appreciate your helping looking into this. Thanks.

[StefH]

I did not find the real issue yet, as a workaround you can use:

var allOrderItemsDynamic = orders.AsQueryable()
            .Select("new (OrderId as Id, OrderItems.Where(w => true) as Children, null as Empty)")
            .ToDynamicList<DynamicClass>();

        foreach (var element in allOrderItemsDynamic)
        {
            object elementAsObj = element;

            var idReflection = elementAsObj.GetType().GetProperty("Id")!.GetValue(elementAsObj);
            Console.WriteLine("idReflection = " + idReflection);

            Console.WriteLine("dynamic = " + element["Id"]);
        }

[StefH]

#838

[StefH]

@groogiam

Can you try preview version System.Linq.Dynamic.Core.1.4.5-preview-01?
it's available at : https://www.myget.org/F/system-linq-dynamic-core/api/v3/index.json

[groogiam]

@StefH I'm not seeing version 1.4.5 in that feed.

[StefH]

Did you check the preview checkbox in VS?

[groogiam]

Doh! I was not paying attention and did not have the box checked. Sorry about that. I tested the updated library on my sample and can confirm the property evaluations now work without exceptions. Thanks.