Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,35 @@
+namespace System.Web.ModelBinding {
+    using System;
+    using System.Collections.Generic;
+    using System.Collections.ObjectModel;
+    using System.Linq;
+
+    public class ModelValidatorProviderCollection : Collection<ModelValidatorProvider> {
+
+        public ModelValidatorProviderCollection() {
+        }
+
+        public ModelValidatorProviderCollection(IList<ModelValidatorProvider> list)
+            : base(list) {
+        }
+
+        protected override void InsertItem(int index, ModelValidatorProvider item) {
+            if (item == null) {
+                throw new ArgumentNullException("item");
+            }
+            base.InsertItem(index, item);
+        }
+
+        protected override void SetItem(int index, ModelValidatorProvider item) {
+            if (item == null) {
+                throw new ArgumentNullException("item");
+            }
+            base.SetItem(index, item);
+        }
+
+        public IEnumerable<ModelValidator> GetValidators(ModelMetadata metadata, ModelBindingExecutionContext context) {
+            return this.SelectMany(provider => provider.GetValidators(metadata, context));
+        }
+
+    }
+}