C# 封装HtmlHelper组件：BootstrapHelper

三、BootstrapHelper组件完善

通过上面一系列发现坑、填坑的经历，一个最最简单的BootstrapHelper组件已经基本可用。我们将LabelExtensions简单完善下：

namespace Extensions
{
 public static class LabelExtensions
 {
  public static MvcHtmlString Label(this BootstrapHelper html, string id)
  {
   return Label(html, id, null, null, null);
  }
  public static MvcHtmlString Label(this BootstrapHelper html, string content)
  {
   return Label(html, null, content, null, null);
  }
  public static MvcHtmlString Label(this BootstrapHelper html, string id, string content)
  {
   return Label(html, id, content, null, null);
  }
  public static MvcHtmlString Label(this BootstrapHelper html, string id, string content, object htmlAttributes)
  {
   return Label(html, id, content, null, htmlAttributes);
  }
  /// <summary>
  /// 通过使用指定的 HTML 帮助器和窗体字段的名称，返回Label标签
  /// </summary>
  /// <param name="html">扩展方法实例</param>
  /// <param name="id">标签的id</param>
  /// <param name="content">标签的内容</param>
  /// <param name="cssClass">标签的class样式</param>
  /// <param name="htmlAttributes">标签的额外属性（如果属性里面含有“-”，请用“_”代替）</param>
  /// <returns>label标签的html字符串</returns>
  public static MvcHtmlString Label(this BootstrapHelper html, string id, string content, string cssClass, object htmlAttributes)
  {
   //定义标签的名称
   TagBuilder tag = new TagBuilder("label");
   //给标签增加额外的属性
   IDictionary<string, object> attributes = BootstrapHelper.AnonymousObjectToHtmlAttributes(htmlAttributes);
   if (!string.IsNullOrEmpty(id))
   {
    attributes.Add("id", id);
   }
   if (!string.IsNullOrEmpty(cssClass))
   {
    //给标签增加样式
    tag.AddCssClass(cssClass);
   }
   //给标签增加文本
   tag.SetInnerText(content);
   tag.AddCssClass("control-label");
   tag.MergeAttributes(attributes);
   return MvcHtmlString.Create(tag.ToString());
  }
 }
}