目的：
扩充Attribute
任意读取并Render 需要的Attribute
用法：
@Html.ParaLabelFor(x=>x.ServiceName):@Html.ParaNameFor(x
=>
x.ServiceName)
代码：
using
System;
using
System.Collections.Generic;
using
System.Linq;
using
System.Web;
using
System.Web.Mvc;
namespace
CardLanPay
{
public
static
class
MyHtmlHelper
{
//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));
//}
public
static
System.Web.Mvc.MvcHtmlString
ParaNameFor<TModel, TValue>(this
System.Web.Mvc.HtmlHelper<TModel>
self, System.Linq.Expressions.Expression<Func<TModel, TValue>>
expression)
{
var
metadata
=
ModelMetadata.FromLambdaExpression(expression, self.ViewData);
var
PropertyName
=
metadata.PropertyName;
if (PropertyName
==
null)
return
MvcHtmlString.Create("");
switch (metadata.ContainerType.FullName)
{
case
"CardLanPay.Areas.Alipay.Models.BaseParaModel":
return
MvcHtmlString.Create(string.Format(@"<span>{0}</span>", Resources.AlipayParaNameResource.ResourceManager.GetString(PropertyName)));
default:
return
MvcHtmlString.Empty;
}
}
public
static
System.Web.Mvc.MvcHtmlString
ParaTextFor<TModel, TValue>(this
System.Web.Mvc.HtmlHelper<TModel>
self, System.Linq.Expressions.Expression<Func<TModel, TValue>>
expression)
{
var
metadata
=
ModelMetadata.FromLambdaExpression(expression, self.ViewData);
var
PropertyName
=
metadata.PropertyName;
if (PropertyName
==
null)
return
MvcHtmlString.Empty;
switch (metadata.ContainerType.FullName)
{
case
"CardLanPay.Areas.Alipay.Models.BaseParaModel":
return
MvcHtmlString.Create(string.Format(@"<span>{0}</span>", Resources.AlipayParaDisplayNameResource.ResourceManager.GetString(PropertyName)));
default:
return
MvcHtmlString.Empty;
}
}
public
static
System.Web.Mvc.MvcHtmlString
ParaLabelFor<TModel, TValue>(this
System.Web.Mvc.HtmlHelper<TModel>
self, System.Linq.Expressions.Expression<Func<TModel, TValue>>
expression)
{
var
metadata
=
ModelMetadata.FromLambdaExpression(expression, self.ViewData);
var
PropertyName
=
metadata.PropertyName;
if (PropertyName
==
null)
return
MvcHtmlString.Empty;
string
text
=
"";
switch (metadata.ContainerType.FullName)
{
case
"CardLanPay.Areas.Alipay.Models.BaseParaModel":
text
=
Resources.AlipayParaDisplayNameResource.ResourceManager.GetString(PropertyName);
break;
default:
break;
}
if (string.IsNullOrEmpty(text))
{
return
MvcHtmlString.Empty;
}
else
{
TagBuilder
tagBuilder
=
new
TagBuilder("label");
tagBuilder.Attributes.Add("for", TagBuilder.CreateSanitizedId(self.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(PropertyName)));
tagBuilder.SetInnerText(text);
return
MvcHtmlString.Create(tagBuilder.ToString());
}
}
}
#region
属性元数据管理
public
abstract
class
MetadataAttribute : Attribute
{
public
abstract
void
Process(ModelMetadata
modelMetaData);
}
public
class
ParaNameModelMetadataProvider : DataAnnotationsModelMetadataProvider
{
protected
override
ModelMetadata
CreateMetadata(
IEnumerable<Attribute>
attributes,
Type
containerType,
Func<object>
modelAccessor,
Type
modelType,
string
propertyName)
{
var
modelMetadata
=
base.CreateMetadata(attributes, containerType, modelAccessor, modelType, propertyName);
attributes.OfType<ParaNameAttribute>().ToList().ForEach(x
=>
x.Process(modelMetadata));
return
modelMetadata;
}
}
/// <summary>
/// 参数名特性类
/// </summary>
/// <remarks>
/// 用于给软件内部的属性指定支付宝接口使用的参数名
/// </remarks>
public
class
ParaNameAttribute : MetadataAttribute
{
private
readonly
string
paraName;
public
ParaNameAttribute(string
paraName)
{
this.paraName
=
paraName;
}
public
string
ParaName
{
get { return
paraName; }
}
public
override
void
Process(ModelMetadata
modelMetaData)
{
modelMetaData.AdditionalValues.Add("ParaName", Resources.AlipayParaNameResource.ResourceManager.GetString(ParaName));
}
}
#endregion
public
class
ParaTextAttribute : System.ComponentModel.DisplayNameAttribute
{
public
ParaTextAttribute(string
displayName)
{
DisplayNameValue
=
Resources.AlipayParaDisplayNameResource.ResourceManager.GetString(displayName);
}
}
}
参考：
http://blog.csdn.net/li_xiao_ming/article/details/10134177
http://www.cnblogs.com/wlitsoft/archive/2012/11/30/mvc-custom-htmlhelper.html