MergeBusinessListGraph[T,C](T, T)' violates the constraint of type 'T'.

[lwmorris067]

I have a weird one. When the SaveAndMergeAsync is executed, I get a this error:

ArgumentException: GenericArguments[0], 'Csi.Security.Shared.CsiRoleClaimIdCollection', on 'Void MergeBusinessListGraph[T,C](T, T)' violates the constraint of type 'T'.

What's strange is that if I uncomment the 3 commented lines, it works. If I replace await security.SaveAndMergeAsync with security = security.Save(), it works.

Any help figuring out how to troubleshoot this would be appreciated.

Thanks!

Test Code:

        [Fact]
        public async void CanSaveRole()
        {
            var security = Csi.Security.Shared.CsiSecurity.Create();

            //var app = Csi.Security.Shared.CsiApplication.CreateChild();
            //app.Name = "App #1";
            //security.Applications.Add(app);

            var obj = Csi.Security.Shared.CsiRole.CreateChild();
            obj.Name = "Role #1";
            security.Roles.Add(obj);
            await security.SaveAndMergeAsync();
        }

Stack Trace:

System.Reflection.TargetInvocationException
HResult=0x80131604
Message=Exception has been thrown by the target of an invocation.
Source=System.Private.CoreLib
StackTrace:
at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)
at Csla.Core.GraphMerger.MergeGraph(IEditableCollection target, IEditableCollection source)
at Csla.Core.GraphMerger.MergeGraph(IEditableBusinessObject target, IEditableBusinessObject source)
at Csla.BusinessBase1.<SaveAndMergeAsync>d__9.MoveNext() at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter.GetResult() at Csla.BusinessBase1.d__8.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
at Csi.Security.Test.CsiRoleTests.d__0.MoveNext() in D:\source\repos\Csi.Security\Csi.Security.Test\CsiRoleTests.cs:line 22

Inner Exception 1:
ArgumentException: GenericArguments[0], 'Csi.Security.Shared.CsiRoleClaimIdCollection', on 'Void MergeBusinessListGraph[T,C](T, T)' violates the constraint of type 'T'.

Inner Exception 2:
VerificationException: Method Csla.Core.GraphMerger.MergeBusinessListGraph: type argument 'Csi.Security.Shared.CsiRoleClaimIdCollection' violates the constraint of type parameter 'T'.

[lwmorris067]

I'm sorry to have bothered you with this.

It appears Roles collection inherited from BusinessBindingListBase vs BusinessListBase. Switching to the later resolved my issue.