Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,58 @@
+namespace System.Web.ModelBinding {
+    using System;
+
+    // Returns a user-specified binder for a given type.
+    public sealed class SimpleModelBinderProvider : ModelBinderProvider {
+
+        private readonly Func<IModelBinder> _modelBinderFactory;
+        private readonly Type _modelType;
+
+        public SimpleModelBinderProvider(Type modelType, IModelBinder modelBinder) {
+            if (modelType == null) {
+                throw new ArgumentNullException("modelType");
+            }
+            if (modelBinder == null) {
+                throw new ArgumentNullException("modelBinder");
+            }
+
+            _modelType = modelType;
+            _modelBinderFactory = () => modelBinder;
+        }
+
+        public SimpleModelBinderProvider(Type modelType, Func<IModelBinder> modelBinderFactory) {
+            if (modelType == null) {
+                throw new ArgumentNullException("modelType");
+            }
+            if (modelBinderFactory == null) {
+                throw new ArgumentNullException("modelBinderFactory");
+            }
+
+            _modelType = modelType;
+            _modelBinderFactory = modelBinderFactory;
+        }
+
+        public Type ModelType {
+            get {
+                return _modelType;
+            }
+        }
+
+        public bool SuppressPrefixCheck {
+            get;
+            set;
+        }
+
+        public override IModelBinder GetBinder(ModelBindingExecutionContext modelBindingExecutionContext, ModelBindingContext bindingContext) {
+            ModelBinderUtil.ValidateBindingContext(bindingContext);
+
+            if (bindingContext.ModelType == ModelType) {
+                if (SuppressPrefixCheck || bindingContext.UnvalidatedValueProvider.ContainsPrefix(bindingContext.ModelName)) {
+                    return _modelBinderFactory();
+                }
+            }
+
+            return null;
+        }
+
+    }
+}