Error where adding a Required rule on an int property

[pszittyay]

Describe the bug
When adding a Required Rule on an int property the error is

Multiple constructors accepting all given argument types have been found in type 'Csla.LazySingleton1[System.Collections.Generic.Dictionary2[Csla.Core.IPropertyInfo,System.Object]]'. There should only be one applicable constructor.
Version and Platform
CSLA version: 8.2.9
OS: Windows.
Platform: WinForms, Net Framework 4.8

Code that Fails

BusinessRules.AddRule(new Required(XYZIntegerProperty, "Cannot be null"));

Stack Trace or Exception Detail
Microsoft.Extensions.DependencyInjection.ActivatorUtilities.TryFindMatchingConstructor(Type instanceType, Type[] argumentTypes, ConstructorInfo& matchingConstructor, Nullable1[]& parameterMap)
en Microsoft.Extensions.DependencyInjection.ActivatorUtilities.FindApplicableConstructor(Type instanceType, Type[] argumentTypes, ConstructorInfo& matchingConstructor, Nullable1[]& matchingParameterMap)
en Microsoft.Extensions.DependencyInjection.ActivatorUtilities.CreateInstance(IServiceProvider provider, Type instanceType, Object[] parameters)
en Csla.Server.DefaultDataPortalActivator.CreateInstance(Type requestedType, Object[] parameters)
en Csla.ApplicationContext.CreateInstanceDI(Type objectType, Object[] parameters)
en Csla.Rules.RuleContext..ctor(ApplicationContext applicationContext, Action1 completeHandler)
en Csla.Rules.BusinessRules.RunRules(IEnumerable1 rules, Boolean cascade, RuleContextModes executionContext)
en Csla.Rules.BusinessRules.CheckRulesForProperty(IPropertyInfo property, Boolean cascade, RuleContextModes executionMode)
en Csla.Rules.BusinessRules.CheckRules(IPropertyInfo property, RuleContextModes executionContext)
en Csla.Core.BusinessBase.CheckPropertyRules(IPropertyInfo property)
en Csla.Core.BusinessBase.SetProperty[P](PropertyInfo`1 propertyInfo, P newValue, NoAccessBehavior noAccess)

Additional context
The problem is resolve when the rule is comment out

[rockfordlhotka]

A couple things to consider.

First, I very much doubt that the RequiredRule would work on an int type, because such a value would never translate to null or "" and so the rule would never fail.

Second, I don't think this code path exists anymore in CSLA 10, after all the work that was done to support nullable types.

[pszittyay]

We have reproduce the same error on a int? type

[rockfordlhotka]

I have tried to replicate this issue in CSLA 10 (v8 is out of support). Here is my test class:

     using Csla;
     using Csla.Rules.CommonRules;

     namespace CslaRequiredRule;

     [CslaImplementProperties]
     public partial class TestBo : BusinessBase<TestBo>
     {
       public partial int? NullableIntValue { get; set; }

       public partial string? StringValue { get; set; }

       protected override void AddBusinessRules()
       {
         base.AddBusinessRules();
         BusinessRules.AddRule(new Required(NullableIntValueProperty));
         BusinessRules.AddRule(new Required(StringValueProperty));
       }

       [Create]
       private async Task Create()
       {
         await BusinessRules.CheckRulesAsync();
       }
     }

Creating and interacting with the int? property appears to work as expected - no exceptions occur.