基于 HtmlHelper 的自定义扩展Container

基于 HtmlHelper 的自定义扩展Container

Intro

基于 asp.net mvc 的权限控制系统的一部分，适用于对UI层数据呈现的控制，基于 HtmlHelper 的扩展组件

Code

基于 asp.net mvc 的权限控制系统示例代码：https://github.com/WeihanLi/AccessControlDemo

权限控制核心代码：https://github.com/WeihanLi/AccessControlDemo/tree/master/AccessControlHelper

SparkContainer 代码：

 public class SparkContainer : IDisposable
     {
         private readonly string _tagName;
         private readonly ViewContext _viewContext;
         private readonly bool _canAccess;
         private bool _disposed;

         private readonly string _content;

         public SparkContainer(ViewContext viewContext, string tagName, bool canAccess = true)
         {
             _viewContext = viewContext;
             _tagName = tagName;
             _canAccess = canAccess;
             if (!_canAccess)
             {
                 _content = (_viewContext.Writer as StringWriter).GetStringBuilder().ToString();
             }
         }

         public void Dispose()
         {
             Dispose(true);
             GC.SuppressFinalize(this);
         }

         protected virtual void Dispose(bool disposing)
         {
             if (!_disposed)
             {
                 _disposed = true;
                 EndShopContainer();
             }
         }

         public void EndShopContainer()
         {
             if (!_canAccess)
             {
                 (_viewContext.Writer as StringWriter).GetStringBuilder().Clear().Append(_content);
             }
             else
             {
                 _viewContext.Writer.Write("</{0}>", _tagName);
             }
         }
     }

扩展方法

 /// <summary>
        /// SparkContainer
        /// </summary>
        /// <param name="helper">HtmlHelper</param>
        /// <param name="tagName">标签名称</param>
        /// <param name="attributes">htmlAttributes</param>
        /// <param name="accessKey">accessKey</param>
        /// <returns></returns>
        public static SparkContainer SparkContainer(this HtmlHelper helper, string tagName, object attributes = null, string accessKey = "")
        {
            // ...
            return SparkContainerHelper(helper, tagName, HtmlHelper.AnonymousObjectToHtmlAttributes(attributes), displayStrategy.IsControlCanAccess(accessKey));
        }

        private static SparkContainer SparkContainerHelper(this HtmlHelper helper, string tagName,
            IDictionary<string, object> attributes = null, bool canAccess = true)
        {
            // ...
            TagBuilder tagBuilder = new TagBuilder(tagName);
            if (canAccess)
            {
                tagBuilder.MergeAttributes(attributes);
                helper.ViewContext.Writer.Write(tagBuilder.ToString(TagRenderMode.StartTag));
            }
            return new SparkContainer(helper.ViewContext, tagName, canAccess);
        }

Use

使用说明：

@using(Html.SparkContainer("div",new { @class="container",custom-attribute = "abcd" }))
{
    @Html.Raw("")
}

没有权限访问时就不会将内容渲染到页面，有权限访问时实际渲染生成的 Html 如下:

 <div class="container" custom-attribute="abcd">
     1234
 </div>

Contact

如果您有什么问题或建议，欢迎与我联系 weihanli@outlook.com