ValidationAttributeAdapterProvider allows ValidationAttribute's sub-classes. (#14074)

This permits to inherit built-in ValidationAttribute classes (ie RegularExpressionValidationAttribute, ...) while keeping the standard behavior.

Fixes https://github.com/aspnet/AspNetCore/issues/13782

src/Mvc/Mvc.DataAnnotations/src/ValidationAttributeAdapterProvider.cs

@@ -29,51 +29,51 @@ namespace Microsoft.AspNetCore.Mvc.DataAnnotations
 
             var type = attribute.GetType();
 
-            if (type == typeof(RegularExpressionAttribute))
+            if (typeof(RegularExpressionAttribute).IsAssignableFrom(type))
             {
                 adapter = new RegularExpressionAttributeAdapter((RegularExpressionAttribute)attribute, stringLocalizer);
             }
-            else if (type == typeof(MaxLengthAttribute))
+            else if (typeof(MaxLengthAttribute).IsAssignableFrom(type))
             {
                 adapter = new MaxLengthAttributeAdapter((MaxLengthAttribute)attribute, stringLocalizer);
             }
-            else if (type == typeof(RequiredAttribute))
+            else if (typeof(RequiredAttribute).IsAssignableFrom(type))
             {
                 adapter = new RequiredAttributeAdapter((RequiredAttribute)attribute, stringLocalizer);
             }
-            else if (type == typeof(CompareAttribute))
+            else if (typeof(CompareAttribute).IsAssignableFrom(type))
             {
                 adapter = new CompareAttributeAdapter((CompareAttribute)attribute, stringLocalizer);
             }
-            else if (type == typeof(MinLengthAttribute))
+            else if (typeof(MinLengthAttribute).IsAssignableFrom(type))
             {
                 adapter = new MinLengthAttributeAdapter((MinLengthAttribute)attribute, stringLocalizer);
             }
-            else if (type == typeof(CreditCardAttribute))
+            else if (typeof(CreditCardAttribute).IsAssignableFrom(type))
             {
                 adapter = new DataTypeAttributeAdapter((DataTypeAttribute)attribute, "data-val-creditcard", stringLocalizer);
             }
-            else if (type == typeof(StringLengthAttribute))
+            else if (typeof(StringLengthAttribute).IsAssignableFrom(type))
             {
                 adapter = new StringLengthAttributeAdapter((StringLengthAttribute)attribute, stringLocalizer);
             }
-            else if (type == typeof(RangeAttribute))
+            else if (typeof(RangeAttribute).IsAssignableFrom(type))
             {
                 adapter = new RangeAttributeAdapter((RangeAttribute)attribute, stringLocalizer);
             }
-            else if (type == typeof(EmailAddressAttribute))
+            else if (typeof(EmailAddressAttribute).IsAssignableFrom(type))
             {
                 adapter = new DataTypeAttributeAdapter((DataTypeAttribute)attribute, "data-val-email", stringLocalizer);
             }
-            else if (type == typeof(PhoneAttribute))
+            else if (typeof(PhoneAttribute).IsAssignableFrom(type))
             {
                 adapter = new DataTypeAttributeAdapter((DataTypeAttribute)attribute, "data-val-phone", stringLocalizer);
             }
-            else if (type == typeof(UrlAttribute))
+            else if (typeof(UrlAttribute).IsAssignableFrom(type))
             {
                 adapter = new DataTypeAttributeAdapter((DataTypeAttribute)attribute, "data-val-url", stringLocalizer);
             }
-            else if (type == typeof(FileExtensionsAttribute))
+            else if (typeof(FileExtensionsAttribute).IsAssignableFrom(type))
             {
                 adapter = new FileExtensionsAttributeAdapter((FileExtensionsAttribute)attribute, stringLocalizer);
             }

src/Mvc/Mvc.DataAnnotations/test/ValidationAttributeAdapterProviderTest.cs

@@ -41,6 +41,10 @@ namespace Microsoft.AspNetCore.Mvc.DataAnnotations
                     {
                         new RequiredAttribute(),
                         typeof(RequiredAttributeAdapter)
+                    },
+                    {
+                        new CustomRegularExpressionAttribute("abc"),
+                        typeof(RegularExpressionAttributeAdapter)
                     }
                 };
             }
@@ -85,5 +89,13 @@ namespace Microsoft.AspNetCore.Mvc.DataAnnotations
             var dataTypeAdapter = Assert.IsType<DataTypeAttributeAdapter>(adapter);
             Assert.Equal(expectedRuleName, dataTypeAdapter.RuleName);
         }
+
+        class CustomRegularExpressionAttribute : RegularExpressionAttribute
+        {
+            public CustomRegularExpressionAttribute(string pattern) : base(pattern)
+            {
+                ErrorMessage = "Not valid.";
+            }
+        }
     }
 }