就我而言，我非常讨厌在我的应用程序中添加服务器标记以解析路径的想法，因此我进行了更多的研究，并选择使用我之前尝试过的用于重写链接的东西 - 响应过滤器。通过这种方式，我可以为所有绝对路径添加已知前缀并在运行时使用Response.Filter对象替换它，而不必担心不必要的服务器标记。如果有帮助，下面是代码。
using System;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
using System.Web;
namespace Demo
{
public class PathRewriter : Stream
{
Stream filter;
HttpContext context;
object writeLock = new object();
StringBuilder sb = new StringBuilder();
Regex eofTag = new Regex("</html>", RegexOptions.IgnoreCase | RegexOptions.Compiled);
Regex rootTag = new Regex("/_AppRoot_", RegexOptions.IgnoreCase | RegexOptions.Compiled);
public PathRewriter(Stream filter, HttpContext context)
{
this.filter = filter;
this.context = context;
}
public override void Write(byte[] buffer, int offset, int count)
{
string temp;
lock (writeLock)
{
temp = Encoding.UTF8.GetString(buffer, offset, count);
sb.Append(temp);
if (eofTag.IsMatch(temp))
RewritePaths();
}
}
public void RewritePaths()
{
byte[] buffer;
string temp;
string root;
temp = sb.ToString();
root = context.Request.ApplicationPath;
if (root == "/") root = "";
temp = rootTag.Replace(temp, root);
buffer = Encoding.UTF8.GetBytes(temp);
filter.Write(buffer, 0, buffer.Length);
}
public override bool CanRead
{
get { return true; }
}
public override bool CanSeek
{
get { return filter.CanSeek; }
}
public override bool CanWrite
{
get { return true; }
}
public override void Flush()
{
return;
}
public override long Length
{
get { return Encoding.UTF8.GetBytes(sb.ToString()).Length; }
}
public override long Position
{
get { return filter.Position; }
set { filter.Position = value; }
}
public override int Read(byte[] buffer, int offset, int count)
{
return filter.Read(buffer, offset, count);
}
public override long Seek(long offset, SeekOrigin origin)
{
return filter.Seek(offset, origin);
}
public override void SetLength(long value)
{
throw new NotImplementedException();
}
}
public class PathFilterModule : IHttpModule
{
public void Dispose()
{
return;
}
public void Init(HttpApplication context)
{
context.ReleaseRequestState += new EventHandler(context_ReleaseRequestState);
}
void context_ReleaseRequestState(object sender, EventArgs e)
{
HttpApplication app = sender as HttpApplication;
if (app.Response.ContentType == "text/html")
app.Response.Filter = new PathRewriter(app.Response.Filter, app.Context);
}
}
}
