CompressFilterAttribute 文件压缩特性

     /// <summary>
     /// 文件压缩特性
     /// </summary>
     public class CompressFilterAttribute : ActionFilterAttribute
     {
         private bool isEnableCompression = true;

         /// <summary>
         /// 构造函数
         /// </summary>
         public CompressFilterAttribute()
         {
         }

         #region OnActionExecuting
         /// <summary>
         /// Action方法执行前执行的方法
         /// </summary>
         /// <param name="filterContext">ActionExecutingContext 对象</param>
         public override void OnActionExecuting(ActionExecutingContext filterContext)
         {
             if (filterContext.ActionDescriptor.IsDefined(typeof(NoCompress), false) || filterContext.ActionDescriptor.ControllerDescriptor.IsDefined(typeof(NoCompress), false))
             {
                 this.isEnableCompression = false;
             }
         }
         #endregion

         #region OnResultExecuted
         /// <summary>
         /// 返回结果集之后执行的方法
         /// </summary>
         /// <param name="filterContext">结果执行上下文</param>
         public override void OnResultExecuted(ResultExecutedContext filterContext)
         {
             if (filterContext.HttpContext.Request.IsAjaxRequest())
             {
                 return;
             }

             if (filterContext.Exception != null)
             {
                 return;
             }

             if (this.isEnableCompression)
             {
                 HttpRequestBase request = filterContext.HttpContext.Request;
                 HttpResponseBase response = filterContext.HttpContext.Response;
                 string acceptEncoding = request.Headers["Accept-Encoding"];

                 if (acceptEncoding == null)
                 {
                     return;
                 }

                 if (acceptEncoding.ToLower().Contains("gzip"))
                 {
                     response.Filter = new GZipStream(response.Filter, CompressionMode.Compress);
                     response.AppendHeader("Content-Encoding", "gzip");
                 }
                 else if (acceptEncoding.ToLower().Contains("deflate"))
                 {
                     response.Filter = new DeflateStream(response.Filter, CompressionMode.Compress);
                     response.AppendHeader("Content-Encoding", "deflate");
                 }
             }
         #endregion
         }
     }

文件压缩特性和排除文件压缩特性的完美结合，相信可以让你满足需求。

排除文件压缩特性：NoCompress

   /// <summary>
     /// 不启用压缩特性
     /// </summary>
     [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = false)]
     public sealed class NoCompress : Attribute
     {
     }