MVC MODEL Attribute 操縱速記

目的：

擴充Attribute

任意讀取并Render 需要的Attribute

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用法：

@Html.ParaLabelFor(x=>x.ServiceName):@Html.ParaNameFor(x=>x.ServiceName)

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代碼：

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usingSystem;

usingSystem.Collections.Generic;

usingSystem.Linq;

usingSystem.Web;

usingSystem.Web.Mvc;

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namespaceCardLanPay

{

publicstaticclassMyHtmlHelper

{

//public static System.Web.Mvc.MvcHtmlString DisplayParaName(this System.Web.Mvc.HtmlHelper helper, string paraName)

//{

// return System.Web.Mvc.MvcHtmlString.Create(Resources.AlipayParaNameResource.ResourceManager.GetString(paraName));

//}

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publicstaticSystem.Web.Mvc.MvcHtmlStringParaNameFor<TModel, TValue>(thisSystem.Web.Mvc.HtmlHelper<TModel>self, System.Linq.ExPRessions.Expression<Func<TModel, TValue>>expression)

{

varmetadata=ModelMetadata.FromLambdaExpression(expression, self.ViewData);

varPropertyName=metadata.PropertyName;

if (PropertyName==null)

returnMvcHtmlString.Create("");

switch (metadata.ContainerType.FullName)

{

case"CardLanPay.Areas.Alipay.Models.BaseParaModel":

returnMvcHtmlString.Create(string.Format(@"<span>{0}</span>", Resources.AlipayParaNameResource.ResourceManager.GetString(PropertyName)));

default:

returnMvcHtmlString.Empty;

}

}

publicstaticSystem.Web.Mvc.MvcHtmlStringParaTextFor<TModel, TValue>(thisSystem.Web.Mvc.HtmlHelper<TModel>self, System.Linq.Expressions.Expression<Func<TModel, TValue>>expression)

{

varmetadata=ModelMetadata.FromLambdaExpression(expression, self.ViewData);

varPropertyName=metadata.PropertyName;

if (PropertyName==null)

returnMvcHtmlString.Empty;

switch (metadata.ContainerType.FullName)

{

case"CardLanPay.Areas.Alipay.Models.BaseParaModel":

returnMvcHtmlString.Create(string.Format(@"<span>{0}</span>", Resources.AlipayParaDisplayNameResource.ResourceManager.GetString(PropertyName)));

default:

returnMvcHtmlString.Empty;

}

}

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publicstaticSystem.Web.Mvc.MvcHtmlStringParaLabelFor<TModel, TValue>(thisSystem.Web.Mvc.HtmlHelper<TModel>self, System.Linq.Expressions.Expression<Func<TModel, TValue>>expression)

{

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varmetadata=ModelMetadata.FromLambdaExpression(expression, self.ViewData);

varPropertyName=metadata.PropertyName;

if (PropertyName==null)

returnMvcHtmlString.Empty;

stringtext="";

switch (metadata.ContainerType.FullName)

{

case"CardLanPay.Areas.Alipay.Models.BaseParaModel":

text=Resources.AlipayParaDisplayNameResource.ResourceManager.GetString(PropertyName);

break;

default:

break;

}

if (string.IsNullOrEmpty(text))

{

returnMvcHtmlString.Empty;

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}

else

{

TagBuildertagBuilder=newTagBuilder("label");

tagBuilder.Attributes.Add("for", TagBuilder.CreateSanitizedId(self.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(PropertyName)));

tagBuilder.SetInnerText(text);

returnMvcHtmlString.Create(tagBuilder.ToString());

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}

}

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}

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#region屬性元數據管理

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publicabstractclassMetadataAttribute : Attribute

{

publicabstractvoidProcess(ModelMetadatamodelMetaData);

}

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publicclassParaNameModelMetadataProvider : DataAnnotationsModelMetadataProvider

{

protectedoverrideModelMetadataCreateMetadata(

IEnumerable<Attribute>attributes,

TypecontainerType,

Func<object>modelaccessor,

TypemodelType,

stringpropertyName)

{

varmodelMetadata=base.CreateMetadata(attributes, containerType, modelAccessor, modelType, propertyName);

attributes.OfType<ParaNameAttribute>().ToList().ForEach(x=>x.Process(modelMetadata));

returnmodelMetadata;

}

}

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/// <summary>

/// 參數名特性類

/// </summary>

/// <remarks>

/// 用于給軟件內部的屬性指定支付寶接口使用的參數名

/// </remarks>

publicclassParaNameAttribute : MetadataAttribute

{

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privatereadonlystringparaName;

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publicParaNameAttribute(stringparaName)

{

this.paraName=paraName;

}

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publicstringParaName

{

get { returnparaName; }

}

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publicoverridevoidProcess(ModelMetadatamodelMetaData)

{

modelMetaData.AdditionalValues.Add("ParaName", Resources.AlipayParaNameResource.ResourceManager.GetString(ParaName));

}

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}

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#endregion

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publicclassParaTextAttribute : System.ComponentModel.DisplayNameAttribute

{

publicParaTextAttribute(stringdisplayName)

{

DisplayNameValue=Resources.AlipayParaDisplayNameResource.ResourceManager.GetString(displayName);

}

}

}

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參考：

http://stackoverflow.com/questions/3885796/get-displayname-attribute-without-using-labelfor-helper-in-asp.net-mvc

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http://blog.csdn.net/li_xiao_ming/article/details/10134177

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http://m.survivalescaperooms.com/wlitsoft/archive/2012/11/30/mvc-custom-htmlhelper.html