1 files changed, 60 insertions, 0 deletions
diff --git a/src/System.Web.Mvc/DataAnnotationsModelMetadata.cs b/src/System.Web.Mvc/DataAnnotationsModelMetadata.cs
new file mode 100644
index 00000000..9b8156e3
--- /dev/null
+++ b/src/System.Web.Mvc/DataAnnotationsModelMetadata.cs
@@ -0,0 +1,60 @@
+using System.ComponentModel.DataAnnotations;
+using System.Globalization;
+using System.Reflection;
+using System.Web.Mvc.Properties;
+
+namespace System.Web.Mvc
+{
+    public class DataAnnotationsModelMetadata : ModelMetadata
+    {
+        private DisplayColumnAttribute _displayColumnAttribute;
+
+        public DataAnnotationsModelMetadata(DataAnnotationsModelMetadataProvider provider, Type containerType,
+                                            Func<object> modelAccessor, Type modelType, string propertyName,
+                                            DisplayColumnAttribute displayColumnAttribute)
+            : base(provider, containerType, modelAccessor, modelType, propertyName)
+        {
+            _displayColumnAttribute = displayColumnAttribute;
+        }
+
+        protected override string GetSimpleDisplayText()
+        {
+            if (Model != null)
+            {
+                if (_displayColumnAttribute != null && !String.IsNullOrEmpty(_displayColumnAttribute.DisplayColumn))
+                {
+                    PropertyInfo displayColumnProperty = ModelType.GetProperty(_displayColumnAttribute.DisplayColumn, BindingFlags.Public | BindingFlags.IgnoreCase | BindingFlags.Instance);
+                    ValidateDisplayColumnAttribute(_displayColumnAttribute, displayColumnProperty, ModelType);
+
+                    object simpleDisplayTextValue = displayColumnProperty.GetValue(Model, new object[0]);
+                    if (simpleDisplayTextValue != null)
+                    {
+                        return simpleDisplayTextValue.ToString();
+                    }
+                }
+            }
+
+            return base.GetSimpleDisplayText();
+        }
+
+        private static void ValidateDisplayColumnAttribute(DisplayColumnAttribute displayColumnAttribute, PropertyInfo displayColumnProperty, Type modelType)
+        {
+            if (displayColumnProperty == null)
+            {
+                throw new InvalidOperationException(
+                    String.Format(
+                        CultureInfo.CurrentCulture,
+                        MvcResources.DataAnnotationsModelMetadataProvider_UnknownProperty,
+                        modelType.FullName, displayColumnAttribute.DisplayColumn));
+            }
+            if (displayColumnProperty.GetGetMethod() == null)
+            {
+                throw new InvalidOperationException(
+                    String.Format(
+                        CultureInfo.CurrentCulture,
+                        MvcResources.DataAnnotationsModelMetadataProvider_UnreadableProperty,
+                        modelType.FullName, displayColumnAttribute.DisplayColumn));
+            }
+        }
+    }
+}