Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/class/System.Web.Mvc3/Mvc/ValidateAntiForgeryTokenAttribute.cs

@@ -0,0 +1,45 @@
+namespace System.Web.Mvc {
+    using System;
+    using System.Diagnostics;
+    using System.Web;
+    using System.Web.Helpers;
+
+    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
+    public sealed class ValidateAntiForgeryTokenAttribute : FilterAttribute, IAuthorizationFilter {
+
+        private string _salt;
+
+        public string Salt {
+            get {
+                return _salt ?? String.Empty;
+            }
+            set {
+                _salt = value;
+            }
+        }
+
+        internal Action ValidateAction {
+            get;
+            private set;
+        }
+
+        public ValidateAntiForgeryTokenAttribute()
+            : this(AntiForgery.Validate) {
+        }
+
+	//Modified to compile MVC3 with the newer System.Web.WebPages helpers
+        internal ValidateAntiForgeryTokenAttribute(Action validateAction) {
+            Debug.Assert(validateAction != null);
+            ValidateAction = validateAction;
+        }
+
+        public void OnAuthorization(AuthorizationContext filterContext) {
+            if (filterContext == null) {
+                throw new ArgumentNullException("filterContext");
+            }
+
+	    //Modified to compile MVC3 with the newer System.Web.WebPages helpers
+            ValidateAction();
+        }
+    }
+}