Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

@@ -0,0 +1,58 @@
+namespace System.Web.ModelBinding {
+    using System;
+    using System.Collections.Generic;
+    using System.Web;
+
+    /// <summary>
+    /// This class provides all the external things that the Model Binding System requires.
+    /// These include HttpContext and ModelState.
+    /// </summary>
+    public class ModelBindingExecutionContext {
+
+        private Dictionary<Type, object> _services = new Dictionary<Type,object>();
+        private HttpContextBase _httpContext;
+        private ModelStateDictionary _modelState;
+
+        public ModelBindingExecutionContext(HttpContextBase httpContext, ModelStateDictionary modelState) {
+            if (httpContext == null) {
+                throw new ArgumentNullException("httpContext");
+            }
+
+            if (modelState == null) {
+                throw new ArgumentNullException("modelState");
+            }
+
+            _httpContext = httpContext;
+            _modelState = modelState;
+        }
+
+        public virtual HttpContextBase HttpContext {
+            get {
+                return _httpContext;
+            }
+        }
+
+        public virtual ModelStateDictionary ModelState {
+            get {
+                return _modelState;
+            }
+        }
+
+        public virtual void PublishService<TService>(TService service) {
+            _services[typeof(TService)] = service;
+        }
+
+        public virtual TService GetService<TService>() {
+            return (TService)_services[typeof(TService)];
+        }
+
+        public virtual TService TryGetService<TService>() {
+            if (_services.ContainsKey(typeof(TService))) {
+                return (TService)_services[typeof(TService)];
+            }
+
+            return default(TService);
+        }
+
+    }
+}