c# - Modify FileStream -


i'm working on class allow editing big text files (4gb+). may sound little stupid not understand how can modify text in stream. here code:

public long  replace(string text1, string text2) {     long replacecount = 0;     currentfilestream = file.open(currentfilename, filemode.open, fileaccess.readwrite, fileshare.none);      using (bufferedstream bs = new bufferedstream(currentfilestream))     using (streamreader sr = new streamreader(bs))       {         string line;         while ((line = sr.readline()) != null)         {             if (line.contains(text1))             {                 line.replace(text1, text2);                  // here should save changed line                 replacecount++;             }         }     }     return replacecount; }

you not replacing anywhere in code. should save text , write again file. like,

  public long  replace(string text1, string text2)  {   long replacecount = 0;    currentfilestream = file.open(currentfilename, filemode.open, fileaccess.readwrite, fileshare.none); stringbuilder sb = new stringbuilder(); using (bufferedstream bs = new bufferedstream(currentfilestream)) using (streamreader sr = new streamreader(bs))   {     string line;     while ((line = sr.readline()) != null)     {         string texttoadd = line;         if (line.contains(text1))         {             texttoadd = line.replace(text1, text2);              // here should save changed line             replacecount++;         }         sb.append(texttoadd);     } } using (filestream filestream = new filestream(filename , filemode, fileaccess))         {             streamwriter streamwriter = new streamwriter(filestream);             streamwriter.write(sb.tostring());             streamwriter.close();             filestream.close();         } return replacecount;

}


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