asp.net c寫檔案函數執行個體代碼

asp教程.net c寫檔案函數執行個體代碼
streamwriter 和 streamreader 向流寫入字元並從流讀取字元。下面的程式碼範例開啟 log.txt 檔案（如果檔案不存在則建立檔案）以進行輸入，並將資訊附加到檔案尾。然後將檔案的內容寫入標準輸出，以便顯示出來。

[c#]
using system;
using system.io;
class dirappend
{
  public static void main(string[] args)
  {
  streamwriter w = file.appendtext("log.txt");
  log ("test1", w);
  log ("test2", w);
  // close the writer and underlying file.
  w.close();
  // open and read the file.
  streamreader r = file.opentext("log.txt");
  dumplog (r);
  }

  public static void log (string logmessage, textwriter w)
  {
  w.write("rnlog entry : ");
  w.writeline("{0} {1}", datetime.now.tolongtimestring(),
  datetime.now.tolongdatestring());
  w.writeline(" :");
  w.writeline(" :{0}", logmessage);
  w.writeline ("-------------------------------");
  // update the underlying file.
  w.flush();
  }

  public static void dumplog (streamreader r)
  {
  // while not at the end of the file, read and write lines.
  string line;
  while ((line=r.readline())!=null)
  {
  console.writeline(line);
  }
  r.close();
  }
}

讀取檔案二

using (filestream fs = new filestream(file, filemode.open,fileaccess.readwrite))
            {
                xmldocument toxml = new xmldocument();
                toxml.load(fs);
                //do some modification for the xml.
                fs.flush();
                toxml.save(fs);
            }

更多詳細內容請查看：http://www.111cn.net/net/c/33608.htm

讀取檔案三

寫檔案

        public static void writefile(string filepath, string str)
        {
            streamwriter sr;
            if (file.exists(filepath)) //如果檔案存在,則建立file.appendtext對象
            {
                sr = file.appendtext(filepath);
             }
            else   //如果檔案不存在,則建立file.createtext對象
            {
                sr = file.createtext(filepath);
            } 
            sr.writeline(str);
            sr.close();
         }