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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;
}
}
}
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