c# - read text file chunks by chunks by scrollbar -

hi have read question :

reading large text files, should incorporating async?

i diged net stack overflow !

the results 14 method none of them not complete !

in 2 last days , working on , tested , benchmarked 14 methods.

for example :

        private void method()         {          filestream fs = new filestream(path, filemode.open, fileaccess.readwrite);          int fsbytes = (int) fs.length;          int chunksize = 24;          byte[] b = new byte[chunksize];          int pos;          (pos = 0; pos < (fsbytes - chunksize); pos += chunksize)          {          fs.read(b,0 , chunksize);         string content = system.text.encoding.default.getstring(b);          richtextbox1.text=content=;           }          b = new byte[fsbytes - pos];          fs.read(b,0, fsbytes - pos);         string content2 = system.text.encoding.default.getstring(b);          richtextbox1text=content2;           fs.close();          fs.dispose();         } 

for 5mb text file , takes long , should ?

this working example of reading text file per stream accomplish trying do. have tested 100 mb text file, , worked well, have see if larger files work well.

this example. bring richtextbox form , vscrollbar. use file 'test.txt' on hard drive 'c:'.

public partial class form1 : form {     const int page_size = 64;   // in characters     int position = 0;  // position in stream      public form1()     {         initializecomponent();     }      private void vscrollbar1_scroll(object sender, scrolleventargs e)     {         position = e.newvalue * page_size;          readfile(position);         }      private void readfile(int position)     {         using (streamreader sr = new streamreader(@"c:\test.txt"))         {             char[] chars = new char[page_size];             sr.basestream.seek(position, seekorigin.begin);             sr.read(chars, 0, page_size);              string text = new string(chars);             richtextbox1.text = text;         }         }      private void form1_load(object sender, eventargs e)     {         readfile(position);     } }