c# - Read previous line using File.ReadLines -

this question has answer here:

• how read text file reversely iterator in c# 8 answers

i want read text file last line because big size , want check today's log content.

i'm using file.readlines() , success read last line. how can read previous line? or there way current line number can subtract number?

foreach (string f in directory.getfiles(sdir, "*.log", searchoption.alldirectories)) {     string last = file.readlines(f, encoding.default).last(); //read last line here      if (last.indexof("error", stringcomparison.ordinalignorecase) > 0)     {         writeerror(last);     } } 

foreach (string f in directory.getfiles(sdir, "*.log", searchoption.alldirectories)) {     string last="", prev="";     foreach (string cur in  file.readlines(f, encoding.default) )     {         prev = last;         last = cur;     }      //not sure want "prev" here.     if (last.indexof("error", stringcomparison.ordinalignorecase) > 0)     {         writeerror(last);     } }