Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/ModelBinding/DataAnnotationsModelValidator.cs

@@ -0,0 +1,63 @@
+namespace System.Web.ModelBinding {
+    using System;
+    using System.Collections.Generic;
+    using System.ComponentModel.DataAnnotations;
+
+    public class DataAnnotationsModelValidator : ModelValidator {
+        public DataAnnotationsModelValidator(ModelMetadata metadata, ModelBindingExecutionContext context, ValidationAttribute attribute)
+            : base(metadata, context) {
+
+            if (attribute == null) {
+                throw new ArgumentNullException("attribute");
+            }
+
+            Attribute = attribute;
+        }
+
+        protected internal ValidationAttribute Attribute { get; private set; }
+
+        protected internal string ErrorMessage {
+            get {
+                return Attribute.FormatErrorMessage(Metadata.GetDisplayName());
+            }
+        }
+
+        public override bool IsRequired {
+            get {
+                return Attribute is RequiredAttribute;
+            }
+        }
+
+        internal static ModelValidator Create(ModelMetadata metadata, ModelBindingExecutionContext context, ValidationAttribute attribute) {
+            return new DataAnnotationsModelValidator(metadata, context, attribute);
+        }
+
+        //Client Validation is different for Web Forms. This will probably need to be enabled when MVC merges with Webforms model binding.
+#if UNDEF
+        public override IEnumerable<ModelClientValidationRule> GetClientValidationRules() {
+            IEnumerable<ModelClientValidationRule> results = base.GetClientValidationRules();
+
+            IClientValidatable clientValidatable = Attribute as IClientValidatable;
+            if (clientValidatable != null) {
+                results = results.Concat(clientValidatable.GetClientValidationRules(Metadata, ModelBindingExecutionContext));
+            }
+
+            return results;
+        }
+#endif
+
+        public override IEnumerable<ModelValidationResult> Validate(object container) {
+            // Per the WCF RIA Services team, instance can never be null (if you have
+            // no parent, you pass yourself for the "instance" parameter).
+            ValidationContext context = new ValidationContext(container ?? Metadata.Model, null, null);
+            context.DisplayName = Metadata.GetDisplayName();
+
+            ValidationResult result = Attribute.GetValidationResult(Metadata.Model, context);
+            if (result != ValidationResult.Success) {
+                yield return new ModelValidationResult {
+                    Message = result.ErrorMessage
+                };
+            }
+        }
+    }
+}