mcs/class/System.Web.Mvc2/System.Web.Mvc/DataAnnotationsModelMetadata.cs

   1 /* ****************************************************************************\r
   2  *\r
   3  * Copyright (c) Microsoft Corporation. All rights reserved.\r
   4  *\r
   5  * This software is subject to the Microsoft Public License (Ms-PL). \r
   6  * A copy of the license can be found in the license.htm file included \r
   7  * in this distribution.\r
   8  *\r
   9  * You must not remove this notice, or any other, from this software.\r
  10  *\r
  11  * ***************************************************************************/\r
  12 \r
  13 namespace System.Web.Mvc {\r
  14     using System;\r
  15     using System.ComponentModel.DataAnnotations;\r
  16     using System.Globalization;\r
  17     using System.Reflection;\r
  18     using System.Web.Mvc.Resources;\r
  19 \r
  20     public class DataAnnotationsModelMetadata : ModelMetadata {\r
  21         private DisplayColumnAttribute _displayColumnAttribute;\r
  22 \r
  23         public DataAnnotationsModelMetadata(DataAnnotationsModelMetadataProvider provider, Type containerType,\r
  24                                             Func<object> modelAccessor, Type modelType, string propertyName,\r
  25                                             DisplayColumnAttribute displayColumnAttribute)\r
  26             : base(provider, containerType, modelAccessor, modelType, propertyName) {\r
  27             _displayColumnAttribute = displayColumnAttribute;\r
  28         }\r
  29 \r
  30         protected override string GetSimpleDisplayText() {\r
  31             if (Model != null) {\r
  32                 if (_displayColumnAttribute != null && !String.IsNullOrEmpty(_displayColumnAttribute.DisplayColumn)) {\r
  33                     PropertyInfo displayColumnProperty = ModelType.GetProperty(_displayColumnAttribute.DisplayColumn, BindingFlags.Public | BindingFlags.IgnoreCase | BindingFlags.Instance);\r
  34                     ValidateDisplayColumnAttribute(_displayColumnAttribute, displayColumnProperty, ModelType);\r
  35 \r
  36                     object simpleDisplayTextValue = displayColumnProperty.GetValue(Model, new object[0]);\r
  37                     if (simpleDisplayTextValue != null) {\r
  38                         return simpleDisplayTextValue.ToString();\r
  39                     }\r
  40                 }\r
  41             }\r
  42 \r
  43             return base.GetSimpleDisplayText();\r
  44         }\r
  45 \r
  46         private static void ValidateDisplayColumnAttribute(DisplayColumnAttribute displayColumnAttribute, PropertyInfo displayColumnProperty, Type modelType) {\r
  47             if (displayColumnProperty == null) {\r
  48                 throw new InvalidOperationException(\r
  49                     String.Format(\r
  50                         CultureInfo.CurrentCulture,\r
  51                         MvcResources.DataAnnotationsModelMetadataProvider_UnknownProperty,\r
  52                         modelType.FullName, displayColumnAttribute.DisplayColumn));\r
  53             }\r
  54             if (displayColumnProperty.GetGetMethod() == null) {\r
  55                 throw new InvalidOperationException(\r
  56                     String.Format(\r
  57                         CultureInfo.CurrentCulture,\r
  58                         MvcResources.DataAnnotationsModelMetadataProvider_UnreadableProperty,\r
  59                         modelType.FullName, displayColumnAttribute.DisplayColumn));\r
  60             }\r
  61         }\r
  62     }\r
  63 }\r