asp.net mvc 2自定义DropdownList控件(2)_.NET学习网|ASP.NET教程|ASP.NET MVC|ASP.NET 源码|VS2010教程|ASP.NET视频教程|vs2010中文旗舰版下载

        public static string DefaultTemplateName
        {
            get
            {
                if (string.IsNullOrEmpty(defaultTemplateName))
                {
                    defaultTemplateName = "DropDownList";
                }

                return defaultTemplateName;
            }
            set
            {
                defaultTemplateName = value;
            }
        }

        public string TemplateName { get; private set; }

        public string ViewDataKey { get; private set; }

        public string DataValueField { get; private set; }

        public string DataTextField { get; private set; }

        public string OptionLabel { get; private set; }

        public IDictionary<string, object> HtmlAttributes { get; private set; }

        public object GetSelectedValue(object model)
        {
            return GetPropertyValue(model, DataValueField);
        }

        public object GetSelectedText(object model)
        {
            return GetPropertyValue(model, !string.IsNullOrEmpty(DataTextField) ? DataTextField : DataValueField);
        }

        private static object GetPropertyValue(object model, string propertyName)
        {
            if (model != null)
            {
                PropertyDescriptor property = GetTypeDescriptor(model.GetType()).GetProperties()
                                                                                .Cast<PropertyDescriptor>()
                                                                                .SingleOrDefault(p => string.Compare(p.Name, propertyName, StringComparison.OrdinalIgnoreCase) == 0);

                if (property != null)
                {
                    return property.GetValue(model);
                }
            }

            return null;
        }

        private static ICustomTypeDescriptor GetTypeDescriptor(Type type)
        {
            return new AssociatedMetadataTypeTypeDescriptionProvider(type).GetTypeDescriptor(type);
        }
    }
}
自定义DataAnnotationsModelMetadata

public class FieldTemplateMetadata : DataAnnotationsModelMetadata
    {
        public FieldTemplateMetadata(DisplayAttribute aa, DataAnnotationsModelMetadataProvider provider, Type containerType, Func<object> modelAccessor, Type modelType, string propertyName, DisplayColumnAttribute displayColumnAttribute, IEnumerable<Attribute> attributes) : base(provider, containerType, modelAccessor, modelType, propertyName, displayColumnAttribute)
        {
            Attributes = new List<Attribute>(attributes);
            Display = aa;
        }

        public IList<Attribute> Attributes
        {
            get;
            private set;
        }
        public DisplayAttribute Display { get; set; }
    }
自定义 DataAnnotationsModelMetadataProvider

public class FieldTemplateMetadataProvider : DataAnnotationsModelMetadataProvider
    {
        protected override ModelMetadata CreateMetadata(IEnumerable<Attribute> attributes, Type containerType, Func<object> modelAccessor, Type modelType, string propertyName)
        {
            DataAnnotationsModelMetadata result = (DataAnnotationsModelMetadata) base.CreateMetadata(attributes, containerType, modelAccessor, modelType, propertyName);

            string templateName = attributes.OfType<ITemplateField>()
                                            .Select(field => field.TemplateName)
                                            .LastOrDefault();
            List<System.Attribute> attributeList = new List<System.Attribute>(attributes);
            DisplayAttribute disp = attributeList.OfType<DisplayAttribute>().FirstOrDefault();
            if (disp != null)
            {
                result.ShortDisplayName = disp.Order.ToString(); ;
                result.Description = disp.Description;
            }



            var data= (new FieldTemplateMetadata(disp, this, containerType, modelAccessor, modelType, propertyName, attributes.OfType<DisplayColumnAttribute>().FirstOrDefault(), attributes)

                    {
                        TemplateHint = !string.IsNullOrEmpty(templateName) ? templateName : result.TemplateHint,
                        HideSurroundingHtml = result.HideSurroundingHtml,
                        DataTypeName = result.DataTypeName,
                        IsReadOnly = result.IsReadOnly,
                        NullDisplayText = result.NullDisplayText,
                        DisplayFormatString = result.DisplayFormatString,
                        ConvertEmptyStringToNull = result.ConvertEmptyStringToNull,
                        EditFormatString = result.EditFormatString,
                        ShowForDisplay = result.ShowForDisplay,
                        ShowForEdit = result.ShowForEdit,
                        DisplayName = result.DisplayName,
                        Description = result.Description,
                        ShortDisplayName = result.ShortDisplayName,

                    });

            SearchFilterAttribute searchFilterAttribute = attributes.OfType<SearchFilterAttribute>().FirstOrDefault();
            if (searchFilterAttribute != null)
            {
                data.AdditionalValues.Add("Search", searchFilterAttribute);
            }

            OrderByAttribute orderByAttribute = attributes.OfType<OrderByAttribute>().FirstOrDefault();
            if (orderByAttribute != null)
            {
                data.AdditionalValues.Add("OrderBy", orderByAttribute);
            }
            return data;
        }
    }

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