利用ResultFilter實現asp.net mvc3 頁面靜態化

為了提高網站效能、和網站的負載能力，頁面靜態化是一種有效方式，這裡對於asp.net mvc3 構架下的網站，提供一種個人認為比較好的靜態話方式。

實現原理是通過mvc提供的過濾器擴充點實現頁面內容的文本儲存，直接上代碼：

View Code public class StaticFileWriteFilterAttribute : FilterAttribute, IResultFilter
    {
        public void OnResultExecuted(ResultExecutedContext filterContext)
        {

        }

        public void OnResultExecuting(ResultExecutingContext filterContext)
        {
            filterContext.HttpContext.Response.Filter = new StaticFileWriteResponseFilterWrapper(filterContext.HttpContext.Response.Filter, filterContext);
        }

        class StaticFileWriteResponseFilterWrapper : System.IO.Stream
        {
            private System.IO.Stream inner;
            private ControllerContext context;
            public StaticFileWriteResponseFilterWrapper(System.IO.Stream s,ControllerContext context)
            {
                this.inner = s;
                this.context = context;
            }

            public override bool CanRead
            {
                get { return inner.CanRead; }
            }

            public override bool CanSeek
            {
                get { return inner.CanSeek; }
            }

            public override bool CanWrite
            {
                get { return inner.CanWrite; }
            }

            public override void Flush()
            {
                inner.Flush();
            }

            public override long Length
            {
                get { return inner.Length; }
            }

            public override long Position
            {
                get
                {
                    return inner.Position;
                }
                set
                {
                    inner.Position = value;
                }
            }

            public override int Read(byte[] buffer, int offset, int count)
            {
                return inner.Read(buffer, offset, count);
            }

            public override long Seek(long offset, System.IO.SeekOrigin origin)
            {
                return inner.Seek(offset, origin);
            }

            public override void SetLength(long value)
            {
                inner.SetLength(value);
            }

            public override void Write(byte[] buffer, int offset, int count)
            {
                inner.Write(buffer, offset, count);
                try
                {
                    string p = context.HttpContext.Server.MapPath(HttpContext.Current.Request.Path);

                    if (Path.HasExtension(p))
                    {
                        string dir = Path.GetDirectoryName(p);
                        if (!Directory.Exists(dir))
                        {
                            Directory.CreateDirectory(dir);
                        }
                        if (File.Exists(p))
                        {
                            File.Delete(p);
                        }
                        File.AppendAllText(p, System.Text.Encoding.UTF8.GetString(buffer));
                    }
                }
                catch
                { 
                
                }
            }
        }
    }

 

我們的類StaticFileWriteFilterAttribute實現了IResultFilter，這個介面有兩個方法，OnResultExecuted和OnResultExecuting，其中OnResultExecuting是在controller中的action代碼執行完畢後，但viewresult執行之前（即頁面內容產生之前）執行；OnResultExecuted方法是在viewresult執行之後（即頁面內容產生之後）執行。

 

我們在頁面產生之前將StaticFileWriteResponseFilterWrapper類註冊給Response對象的Filter屬性，這裡使用封裝類可以在沒有副作用的情況下注入頁面內容靜態化的代碼，對於處理商務邏輯的action是透明的。