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

   1 namespace System.Web.Mvc {
   2     using System;
   3     using System.ComponentModel.DataAnnotations;
   4     using System.Globalization;
   5     using System.Reflection;
   6     using System.Web.Mvc.Resources;
   7
   8     public class DataAnnotationsModelMetadata : ModelMetadata {
   9         private DisplayColumnAttribute _displayColumnAttribute;
  10
  11         public DataAnnotationsModelMetadata(DataAnnotationsModelMetadataProvider provider, Type containerType,
  12                                             Func<object> modelAccessor, Type modelType, string propertyName,
  13                                             DisplayColumnAttribute displayColumnAttribute)
  14             : base(provider, containerType, modelAccessor, modelType, propertyName) {
  15             _displayColumnAttribute = displayColumnAttribute;
  16         }
  17
  18         protected override string GetSimpleDisplayText() {
  19             if (Model != null) {
  20                 if (_displayColumnAttribute != null && !String.IsNullOrEmpty(_displayColumnAttribute.DisplayColumn)) {
  21                     PropertyInfo displayColumnProperty = ModelType.GetProperty(_displayColumnAttribute.DisplayColumn, BindingFlags.Public | BindingFlags.IgnoreCase | BindingFlags.Instance);
  22                     ValidateDisplayColumnAttribute(_displayColumnAttribute, displayColumnProperty, ModelType);
  23
  24                     object simpleDisplayTextValue = displayColumnProperty.GetValue(Model, new object[0]);
  25                     if (simpleDisplayTextValue != null) {
  26                         return simpleDisplayTextValue.ToString();
  27                     }
  28                 }
  29             }
  30
  31             return base.GetSimpleDisplayText();
  32         }
  33
  34         private static void ValidateDisplayColumnAttribute(DisplayColumnAttribute displayColumnAttribute, PropertyInfo displayColumnProperty, Type modelType) {
  35             if (displayColumnProperty == null) {
  36                 throw new InvalidOperationException(
  37                     String.Format(
  38                         CultureInfo.CurrentCulture,
  39                         MvcResources.DataAnnotationsModelMetadataProvider_UnknownProperty,
  40                         modelType.FullName, displayColumnAttribute.DisplayColumn));
  41             }
  42             if (displayColumnProperty.GetGetMethod() == null) {
  43                 throw new InvalidOperationException(
  44                     String.Format(
  45                         CultureInfo.CurrentCulture,
  46                         MvcResources.DataAnnotationsModelMetadataProvider_UnreadableProperty,
  47                         modelType.FullName, displayColumnAttribute.DisplayColumn));
  48             }
  49         }
  50     }
  51 }