最简单的: --------写 //content是要写入文本的字符串 //(@txtPath + @"\" + rid + ".txt");要被写入的TXT  StreamWriter sw = new StreamWriter(@txtPath + @"\" + rid + ".txt");  sw.WriteLine(content);  sw.Close(); ---------读 //folder被读取的文件路径 text = File.ReadAllText(folder, System.Text.Encoding.GetEncoding("gb2312")); -------写入流             //将string写入文件                 try                 {                     FileStream fs = new FileStream(@"d:\数据处理\法规20080116HTML\" + Actid.ToString() + ".html", FileMode.OpenOrCreate, FileAccess.Write);                     StreamWriter sw = new StreamWriter(fs,System.Text.Encoding.GetEncoding("gb2312"));                     sw.Flush();                     sw.BaseStream.Seek(0, SeekOrigin.Begin);                     sw.Write(pageContent);                     sw.Close();                 }                 catch (Exception ex) { } //HTTP向应后写出文件 HttpWebRequest myWebRequest = (HttpWebRequest)WebRequest.Create("http://www.microsoft.com"); WebResponse result = null; try {     myWebRequest = (HttpWebRequest)WebRequest.Create(Url);     result = myWebRequest.GetResponse();     Stream response = result.GetResponseStream();     byte[] bytes = new byte[10240];     int n = 1;     FileStream fs = File.Create(@"d:\数据处理\法规20080116HTML\" + Actid.ToString() + ".html");     while (n > 0)     {         n = response.Read(bytes, 0, 10240);         fs.Write(bytes, 0, n);     }     response.Close();     fs.Close(); } catch (Exception ex) { } //读取 string FileContent = File.ReadAllText(path, System.Text.Encoding.GetEncoding("gb2312"));