Fixed issue where exceptions in validators would unexpectedly be converted into AggregateException

Author: icnocop

Directory.Build.props

@@ -1,7 +1,7 @@
 <Project>
     <PropertyGroup>
         <Nullable>enable</Nullable>
-        <LangVersion>8.0</LangVersion>
+        <LangVersion>9.0</LangVersion>
         <NoWarn>NU1701</NoWarn>
         <EmbedUntrackedSources>true</EmbedUntrackedSources>
         <IncludeSymbols>true</IncludeSymbols>

FluentValidation.AutoValidation.Mvc/src/Validation/FluentValidationAutoValidationValidationVisitor.cs

@@ -30,15 +30,15 @@ public override bool Validate(ModelMetadata? metadata, string? key, object? mode
         {
             // If built in model validation is disabled return true for later validation in the action filter.
             bool isBaseValid = disableBuiltInModelValidation || base.Validate(metadata, key, model, alwaysValidateAtTopLevel);
-            return ValidateAsync(isBaseValid, key, model).Result;
+            return ValidateAsync(isBaseValid, key, model).GetAwaiter().GetResult();
         }
 
 #if !NETCOREAPP3_1
         public override bool Validate(ModelMetadata? metadata, string? key, object? model, bool alwaysValidateAtTopLevel, object? container)
         {
             // If built in model validation is disabled return true for later validation in the action filter.
             bool isBaseValid = disableBuiltInModelValidation || base.Validate(metadata, key, model, alwaysValidateAtTopLevel, container);
-            return ValidateAsync(isBaseValid, key, model).Result;
+            return ValidateAsync(isBaseValid, key, model).GetAwaiter().GetResult();
         }
 #endif