mvc给html扩展方法：

注意：扩展方法和所在的类都必须是 public static
如果在页面直接使用新扩展的方法，需要web.config里把Web.Helper名称命名空间加上，页面才能访问到
<namespaces>
<add namespace="System.Web.Helpers" />
<add namespace="System.Web.Mvc" />
<add namespace="System.Web.Mvc.Ajax" />
<add namespace="System.Web.Mvc.Html" />
<add namespace="System.Web.Routing" />
<add namespace="System.Web.WebPages"/>
<add namespace="Web.Helper" />
</namespaces>
namespace MyHtmlExtension
{
public static class HtmlExtensions
{
#region Admin area extensions

public static MvcHtmlString Hint(this HtmlHelper helper, string value)
{
// Create tag builder
var builder = new TagBuilder("img");

// Add attributes
var urlHelper = new UrlHelper(helper.ViewContext.RequestContext);
var url = MvcHtmlString.Create(urlHelper.Content("~/Administration/Content/images/ico-help.gif")).ToHtmlString();

builder.MergeAttribute("src", url);
builder.MergeAttribute("alt", value);
builder.MergeAttribute("title", value);

// Render tag
return MvcHtmlString.Create(builder.ToString());
}

public static HelperResult LocalizedEditor<T, TLocalizedModelLocal>(this HtmlHelper<T> helper, string name,
Func<int, HelperResult> localizedTemplate,
Func<T, HelperResult> standardTemplate)
where T : ILocalizedModel<TLocalizedModelLocal>
where TLocalizedModelLocal : ILocalizedModelLocal
{
return new HelperResult(writer =>
{
if (helper.ViewData.Model.Locales.Count > 1)
{
var tabStrip = new StringBuilder();
tabStrip.AppendLine(string.Format("<div id='{0}'>", name));
tabStrip.AppendLine("<ul>");

//default tab
tabStrip.AppendLine("<li class='k-state-active'>");
tabStrip.AppendLine("Standard");
tabStrip.AppendLine("</li>");

for (int i = 0; i < helper.ViewData.Model.Locales.Count; i++)
{
//languages
var locale = helper.ViewData.Model.Locales[i];
var language = EngineContext.Current.Resolve<ILanguageService>().GetLanguageById(locale.LanguageId);

tabStrip.AppendLine("<li>");
var urlHelper = new UrlHelper(helper.ViewContext.RequestContext);
var iconUrl = urlHelper.Content("~/Content/images/flags/" + language.FlagImageFileName);
tabStrip.AppendLine(string.Format("<img class='k-image' alt='' src='{0}'>", iconUrl));
tabStrip.AppendLine(HttpUtility.HtmlEncode(language.Name));
tabStrip.AppendLine("</li>");
}
tabStrip.AppendLine("</ul>");

//default tab
tabStrip.AppendLine("<div>");
tabStrip.AppendLine(standardTemplate(helper.ViewData.Model).ToHtmlString());
tabStrip.AppendLine("</div>");

for (int i = 0; i < helper.ViewData.Model.Locales.Count; i++)
{
//languages
tabStrip.AppendLine("<div>");
tabStrip.AppendLine(localizedTemplate(i).ToHtmlString());
tabStrip.AppendLine("</div>");
}
tabStrip.AppendLine("</div>");
tabStrip.AppendLine("<script>");
tabStrip.AppendLine("$(document).ready(function() {");
tabStrip.AppendLine(string.Format("$('#{0}').kendoTabStrip(", name));
tabStrip.AppendLine("{");
tabStrip.AppendLine("animation: {");
tabStrip.AppendLine("open: {");
tabStrip.AppendLine("effects: "fadeIn"");
tabStrip.AppendLine("}");
tabStrip.AppendLine("}");
tabStrip.AppendLine("});");
tabStrip.AppendLine("});");
tabStrip.AppendLine("</script>");
writer.Write(new MvcHtmlString(tabStrip.ToString()));
}
else
{
standardTemplate(helper.ViewData.Model).WriteTo(writer);
}
});
}

public static MvcHtmlString DeleteConfirmation<T>(this HtmlHelper<T> helper, string buttonsSelector) where T : BaseYipongEntityModel
{
return DeleteConfirmation<T>(helper, "", buttonsSelector);
}

public static MvcHtmlString DeleteConfirmation<T>(this HtmlHelper<T> helper, string actionName,
string buttonsSelector) where T : BaseYipongEntityModel
{
if (String.IsNullOrEmpty(actionName))
actionName = "Delete";