file io - Random lines not being written from streamwriter C# -

i working on fixing issue legacy code. code reads csv, checks data validity, writes document outfile.

i having difficulty determining reason process being hung up. stuck in infinite loop. issue happens on same line every time (line 262). have removed line , runs line 1885 because getting hung again. continued remove lines causing issues on file , test file. weird errorline file ran fine when in file. makes me think issue must coming streamwriter.

i have streamwriter set autoflush = true. using using block should handle flush/close of streamwriter.

the files come in number of different sizes, handful of rows , several thousand rows.

foreach (string e in filenames)                 {                      using (streamwriter sw = new streamwriter(e.replace(inputdirectory, outputdirectory), false, encoding.unicode))                     {                         sw.autoflush = true;                         using (streamreader sr = new streamreader(e,encoding.unicode))                         {                             int peek = sr.peek();                             while (peek > -1)                              {                                 if (((char)peek).equals(textqual))                                          {                                             sw.write(((char)sr.read()));                                             peek = sr.peek();                                             if (((char)peek).equals(textqual2))                                             {                                                 sw.write(((char)sr.read()));                                                  peek = sr.peek();                                                 while (peek > 1)                                                 {                                                     if (((char)peek).equals((char)0x0a) || ((char)peek).equals((char)0x0d))                                                      {                                                         check = false;                                                          row++;                                                         if (firstcol == 0)                                                         {                                                             firstcol = col;                                                         }                                                         col = 0;                                                          break;                                                     }                                                     else if (((char)peek).equals(del))                                                      {                                                         check = false;                                                          break;                                                     }                                                     else if (((char)peek).equals((char)0x22))                                                     {                                                         sr.read();                                                         doubleq++;                                                     }                                                      else                                                     {                                                         sw.write(((char)sr.read()));                                                         peek = sr.peek();                                                         break;                                                     }                                                 }                                              }                             } 

i looking suggestions issue not sure coming from.

you in infinite loop due while (peek > -1) wich evaluate true (if strream contains @ least 1 character).

correct code this:

int peek = 0; while ( (peek = sr.peek ()) > -1) {     char c = (char)peek;    // doe whatever want picked character      sr.read ();   } 

in oppinion dangerous code because there cases when while can run forever. example, if statement:

if (((char)peek).equals(textqual))  

above, if first character not equal textqual while run forever. not mentioning can happen characters read further.

above piece of code wouldn't recommend put in production.