在asp.net mvc上为所有html.textbox添加相同的类

Question

我在ASP.NET MVC 4中有一个项目,最近使用Bootstrap进行了视觉上的改进.

虽然我对它很满意,但有人认为我并不十分满意.

我不得不补充一下

new { @class = "form-control input-sm" } 

对我所有的Html.TextBox助手调用.我想知道是否有更优雅的方法来做到这一点......可能会覆盖默认的TextBox助手？

任何有关这方面的见解将非常感激.

Answer 1

编辑

它实际上是可行的 - 覆盖扩展方法.有关参考,请参阅:如何覆盖现有的扩展方法.

视图在"ASP"命名空间中创建; 因此,为了使您的扩展方法覆盖System.Web.Mvc.Html中的默认扩展方法(即静态类InputExtensions),您还必须在"ASP"命名空间中声明您的覆盖.所以在你的MVC项目中定义类InputExtensionOverride.cs如下:

using System;
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Web.Mvc;

namespace ASP {
  public static class InputExtensionsOverride {
    public static MvcHtmlString TextBoxFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression) {
      return InputExtensionsOverride.TextBoxFor<TModel, TProperty>(htmlHelper, expression, (string)null);
    }

    public static MvcHtmlString TextBoxFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, IDictionary<string, object> htmlAttributes) {
      return InputExtensionsOverride.TextBoxFor<TModel, TProperty>(htmlHelper, expression, (string)null, htmlAttributes);
    }

    public static MvcHtmlString TextBoxFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, object htmlAttributes) {
      var dictionary = HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes);
      return InputExtensionsOverride.TextBoxFor<TModel, TProperty>(htmlHelper, expression, (string)null, dictionary);
    }

    public static MvcHtmlString TextBoxFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, string format) {
      return InputExtensionsOverride.TextBoxFor<TModel, TProperty>(htmlHelper, expression, format, ((IDictionary<string, object>)null));
    }

    public static MvcHtmlString TextBoxFor<TModel, TProperty>(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, string format, IDictionary<string, object> htmlAttributes) {
      htmlAttributes = SetCommonAttributes<TModel, TProperty>(htmlHelper, expression, ref htmlAttributes);
      return System.Web.Mvc.Html.InputExtensions.TextBoxFor(htmlHelper, expression, format, htmlAttributes);
    }

    private static IDictionary<string, object> SetCommonAttributes<TModel, TProperty>(HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression, ref IDictionary<string, object> htmlAttributes) {
      if (htmlHelper == null) {
        throw new ArgumentNullException("htmlHelper");
      }

      if (expression == null) {
        throw new ArgumentNullException("expression");
      }

      if (htmlAttributes == null) {
        htmlAttributes = new Dictionary<string, object>();
      }

      if (!htmlAttributes.ContainsKey("class")) {
        htmlAttributes.Add("class", "form-control input-sm");
      }

      return htmlAttributes;
    }
  }

}

在您看来,没有变化 - 即:

@using (Html.BeginForm()) {
   @Html.TextBoxFor(m => m.SomeProperty)
}

将生成带有"form-control input-sm"css类的文本框.