Code source pour DataAnnotationsModelMetadataProvider

Question

Pour certaines raisons, .NET Reflector émet une exception lorsque j'essaie de réfléchir sur cette classe. Cela fonctionne pour tout le reste.

Quel est le code source de DataAnnotationsModelMetadataProvider, s'il vous plaît?

Answer 1

N'hésitez pas à télécharger le ASP.NET MVC source code et d'inspecter la mise en œuvre. Voici à quoi cela ressemble dans ASP.NET MVC 3 RTM:

namespace System.Web.Mvc { 
    using System; 
    using System.Collections.Generic; 
    using System.ComponentModel; 
    using System.ComponentModel.DataAnnotations; 
    using System.Linq; 

    public class DataAnnotationsModelMetadataProvider : AssociatedMetadataProvider { 

     protected override ModelMetadata CreateMetadata(IEnumerable<Attribute> attributes, Type containerType, Func<object> modelAccessor, Type modelType, string propertyName) { 
      List<Attribute> attributeList = new List<Attribute>(attributes); 
      DisplayColumnAttribute displayColumnAttribute = attributeList.OfType<DisplayColumnAttribute>().FirstOrDefault(); 
      DataAnnotationsModelMetadata result = new DataAnnotationsModelMetadata(this, containerType, modelAccessor, modelType, propertyName, displayColumnAttribute); 

      // Do [HiddenInput] before [UIHint], so you can override the template hint 
      HiddenInputAttribute hiddenInputAttribute = attributeList.OfType<HiddenInputAttribute>().FirstOrDefault(); 
      if (hiddenInputAttribute != null) { 
       result.TemplateHint = "HiddenInput"; 
       result.HideSurroundingHtml = !hiddenInputAttribute.DisplayValue; 
      } 

      // We prefer [UIHint("...", PresentationLayer = "MVC")] but will fall back to [UIHint("...")] 
      IEnumerable<UIHintAttribute> uiHintAttributes = attributeList.OfType<UIHintAttribute>(); 
      UIHintAttribute uiHintAttribute = uiHintAttributes.FirstOrDefault(a => String.Equals(a.PresentationLayer, "MVC", StringComparison.OrdinalIgnoreCase)) 
              ?? uiHintAttributes.FirstOrDefault(a => String.IsNullOrEmpty(a.PresentationLayer)); 
      if (uiHintAttribute != null) { 
       result.TemplateHint = uiHintAttribute.UIHint; 
      } 

      DataTypeAttribute dataTypeAttribute = attributeList.OfType<DataTypeAttribute>().FirstOrDefault(); 
      if (dataTypeAttribute != null) { 
       result.DataTypeName = dataTypeAttribute.ToDataTypeName(); 
      } 

      EditableAttribute editable = attributes.OfType<EditableAttribute>().FirstOrDefault(); 
      if (editable != null) { 
       result.IsReadOnly = !editable.AllowEdit; 
      } 
      else { 
       ReadOnlyAttribute readOnlyAttribute = attributeList.OfType<ReadOnlyAttribute>().FirstOrDefault(); 
       if (readOnlyAttribute != null) { 
        result.IsReadOnly = readOnlyAttribute.IsReadOnly; 
       } 
      } 

      DisplayFormatAttribute displayFormatAttribute = attributeList.OfType<DisplayFormatAttribute>().FirstOrDefault(); 
      if (displayFormatAttribute == null && dataTypeAttribute != null) { 
       displayFormatAttribute = dataTypeAttribute.DisplayFormat; 
      } 
      if (displayFormatAttribute != null) { 
       result.NullDisplayText = displayFormatAttribute.NullDisplayText; 
       result.DisplayFormatString = displayFormatAttribute.DataFormatString; 
       result.ConvertEmptyStringToNull = displayFormatAttribute.ConvertEmptyStringToNull; 

       if (displayFormatAttribute.ApplyFormatInEditMode) { 
        result.EditFormatString = displayFormatAttribute.DataFormatString; 
       } 

       if (!displayFormatAttribute.HtmlEncode && String.IsNullOrWhiteSpace(result.DataTypeName)) { 
        result.DataTypeName = DataTypeUtil.HtmlTypeName; 
       } 
      } 

      ScaffoldColumnAttribute scaffoldColumnAttribute = attributeList.OfType<ScaffoldColumnAttribute>().FirstOrDefault(); 
      if (scaffoldColumnAttribute != null) { 
       result.ShowForDisplay = result.ShowForEdit = scaffoldColumnAttribute.Scaffold; 
      } 

      DisplayAttribute display = attributes.OfType<DisplayAttribute>().FirstOrDefault(); 
      string name = null; 
      if (display != null) { 
       result.Description = display.GetDescription(); 
       result.ShortDisplayName = display.GetShortName(); 
       result.Watermark = display.GetPrompt(); 
       result.Order = display.GetOrder() ?? ModelMetadata.DefaultOrder; 

       name = display.GetName(); 
      } 

      if (name != null) { 
       result.DisplayName = name; 
      } 
      else { 
       DisplayNameAttribute displayNameAttribute = attributeList.OfType<DisplayNameAttribute>().FirstOrDefault(); 
       if (displayNameAttribute != null) { 
        result.DisplayName = displayNameAttribute.DisplayName; 
       } 
      } 

      RequiredAttribute requiredAttribute = attributeList.OfType<RequiredAttribute>().FirstOrDefault(); 
      if (requiredAttribute != null) { 
       result.IsRequired = true; 
      } 

      return result; 
     } 
    } 
}