Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

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

@@ -0,0 +1,30 @@
+namespace System.Web.Mvc {
+    using System;
+    using System.ComponentModel;
+    using System.Reflection;
+
+    internal static class ParameterInfoUtil {
+
+        public static bool TryGetDefaultValue(ParameterInfo parameterInfo, out object value) {
+            // this will get the default value as seen by the VB / C# compilers
+            // if no value was baked in, RawDefaultValue returns DBNull.Value
+            object defaultValue = parameterInfo.DefaultValue;
+            if (defaultValue != DBNull.Value) {
+                value = defaultValue;
+                return true;
+            }
+
+            // if the compiler did not bake in a default value, check the [DefaultValue] attribute
+            DefaultValueAttribute[] attrs = (DefaultValueAttribute[])parameterInfo.GetCustomAttributes(typeof(DefaultValueAttribute), false);
+            if (attrs == null || attrs.Length == 0) {
+                value = default(object);
+                return false;
+            }
+            else {
+                value = attrs[0].Value;
+                return true;
+            }
+        }
+
+    }
+}