Asp.Net MVC 页面代码压缩筛选器-自定义删除无效内容

Asp.Net MVC 页面代码压缩筛选器

首先定义以下筛选器，用于代码压缩。

/*页面压缩 筛选器*/public class WhiteSpaceFilter : Stream{private Stream _shrink;private Func<string, string> _filter;public WhiteSpaceFilter(Stream shrink, Func<string, string> filter){_shrink = shrink;_filter = filter;}public override bool CanRead { get { return true; } }public override bool CanSeek { get { return true; } }public override bool CanWrite { get { return true; } }public override void Flush() { _shrink.Flush(); }public override long Length { get { return 0; } }public override long Position { get; set; }public override int Read(byte[] buffer, int offset, int count){return _shrink.Read(buffer, offset, count);}public override long Seek(long offset, SeekOrigin origin){return _shrink.Seek(offset, origin);}public override void SetLength(long value){_shrink.SetLength(value);}public override void Close(){_shrink.Close();}public override void Write(byte[] buffer, int offset, int count){// capture the data and convert to stringbyte[] data = new byte[count];Buffer.BlockCopy(buffer, offset, data, 0, count);string s = Encoding.GetEncoding("gb2312").GetString(buffer);// filter the strings = _filter(s);// write the data to streambyte[] outdata = Encoding.GetEncoding("gb2312").GetBytes(s);_shrink.Write(outdata, 0, outdata.GetLength(0));}}public class WhitespaceFilterAttribute : ActionFilterAttribute{public override void OnActionExecuting(ActionExecutingContext filterContext){var request = filterContext.HttpContext.Request;var response = filterContext.HttpContext.Response;response.Filter = new WhiteSpaceFilter(response.Filter, s =>{s = Regex.Replace(s, @"\s+(?=<)|\s+$|(?<=>)\s+|<!--.+-->|[ ]+//.+\n|/\*.+\*/|\n", "");//single-line doctype must be preservedvar firstEndBracketPosition = s.IndexOf(">");if (firstEndBracketPosition >= 0){s = s.Remove(firstEndBracketPosition, 1);s = s.Insert(firstEndBracketPosition, ">");}return s;});}}/*页面压缩 筛选器 end*/

在要压缩页面的action上使用。

[WhitespaceFilter]
public ActionResult home()
{return View();
}

我们可以自行修改替换规则,以达到最优化。

s = Regex.Replace(s, @"\s+(?=<)|\s+$|(?<=>)\s+|<!--.+-->|[ ]+//.+\n|/\*.+\*/|\n", "");