c# - Look if file contains a specific string and then read that line -

i using foreach loop search files in directory , read them.

    foreach (string file in directory.enumeratefiles(location, "*.mai")) 

inside loop want search line in file contains word "sended". there way word , read line?

try it:

var location = @"<your location>"; foreach (string file in directory.enumeratefiles(location, "*.mai")) {     var findedlines = file.readalllines(file)                           .where(l => l.contains("sended")); } 

if work big files, should use readlines method, because when use readlines, can start enumerating collection of strings before whole collection returned; when use readalllines, must wait whole array of strings returned before can access array.

another example msdn:

var files = file in directory.enumeratefiles(location, "*.mai")             line in file.readlines(file)             line.contains("sended")             select new             {                 file = file,                 line = line             }; 

full information, here: https://msdn.microsoft.com/library/dd383503.aspx