1 files changed, 33 insertions, 0 deletions
diff --git a/src/System.Web.Mvc/ParameterInfoUtil.cs b/src/System.Web.Mvc/ParameterInfoUtil.cs
new file mode 100644
index 00000000..e7343cdf
--- /dev/null
+++ b/src/System.Web.Mvc/ParameterInfoUtil.cs
@@ -0,0 +1,33 @@
+using System.ComponentModel;
+using System.Reflection;
+
+namespace System.Web.Mvc
+{
+    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;
+            }
+        }
+    }
+}