1 public class WhiteSpaceFilter : Stream
2 {
3 private Stream _shrink;
4 private Func<string, string> _filter;
5
6 public WhiteSpaceFilter(Stream shrink, Func<string, string> filter)
7 {
8 _shrink = shrink;
9 _filter = filter;
10 }
11
12
13 public override bool CanRead { get { return true; } }
14 public override bool CanSeek { get { return true; } }
15 public override bool CanWrite { get { return true; } }
16 public override void Flush() { _shrink.Flush(); }
17 public override long Length { get { return 0; } }
18 public override long Position { get; set; }
19 public override int Read(byte[] buffer, int offset, int count)
20 {
21 return _shrink.Read(buffer, offset, count);
22 }
23 public override long Seek(long offset, SeekOrigin origin)
24 {
25 return _shrink.Seek(offset, origin);
26 }
27 public override void SetLength(long value)
28 {
29 _shrink.SetLength(value);
30 }
31 public override void Close()
32 {
33 _shrink.Close();
34 }
35
36 public override void Write(byte[] buffer, int offset, int count)
37 {
38 // capture the data and convert to string
39 byte[] data = new byte[count];
40 Buffer.BlockCopy(buffer, offset, data, 0, count);
41 string s = Encoding.UTF8.GetString(buffer);
42
43 // filter the string
44 s = _filter(s);
45
46 // write the data to stream
47 byte[] outdata = Encoding.UTF8.GetBytes(s);
48 _shrink.Write(outdata, 0, outdata.GetLength(0));
49 }
50 }
51 /// <summary>
52 /// 压缩html
53 /// </summary>
54 public class WhitespaceFilterAttribute : ActionFilterAttribute
55 {
56 public override void OnActionExecuting(ActionExecutingContext filterContext)
57 {
58 var request = filterContext.HttpContext.Request;
59 var response = filterContext.HttpContext.Response;
60 response.Filter = new WhiteSpaceFilter(response.Filter, s =>
61 {
62 s = Regex.Replace(s, @"\s+(?=<)|\s+$|(?<=>)\s+", "");
63
64 //single-line doctype must be preserved
65 var firstEndBracketPosition = s.IndexOf(">");
66 if (firstEndBracketPosition >= 0)
67 {
68 s = s.Remove(firstEndBracketPosition, 1);
69 s = s.Insert(firstEndBracketPosition, ">");
70 }
71 return s;
72 });
73 }
74 }
写一个basecontrol 当做属性来用
