Multithreading in c# - Replicate Console class behaviour -

i have application executed 4 function sequentially. inside each function have outputs logged using console.writeline. console internally made redirect data file.

i have change working 4 functions can run in parallel. else being fine concern output logging in file. console.writeline write data in file in random order don't want. want threads finish , log output data in sequence want.

so how capture output inside each thread?

1. in string , console.writeline 4 string make?
2. capture data in file each thread , console.writeline when thread finish.
3. some other class console data read/written in same way console class?

i want output same how earlier when application running function sequentially.

if know of output fit in memory, can write output strings , append strings file when done.

there many ways output string. purposes, perhaps easiest create stringwriter each thread. example:

stringwriter output = new stringwriter(); 

then, replace of console.writeline calls output.writeline.

when thread has finished, can convert output string calling tostring. is:

string threadoutput = output.tostring(); 

then take each thread's output , write file in order want.

if output large fit in memory, have each thread open streamwriter, write file. when 4 threads done, can open each of files in turn, read data, , write output. like:

using (filestream outputfile = file.openwrite(outputfilename)) {     // following each thread's output     using (filestream threadfile = file.openread(inputfilename))     {         threadfile.copyto(outputfile);     } }