How to File.AppendAllText create subdirectory if doesn't exist?

Question

In c# how File.AppendAllText can create subdirectory if doesn't exist and i try this but it not working

File.AppendAllText("\\Logs\\date.txt", "Hi");

Answer 1

You should check if the directory exists, and create it if it does not, like this:

string filename = "\\Logs\\date.txt";
string directoryName = Path.GetDirectoryName(filename);
if (!Directory.Exists(directoryName)) 
{
    Directory.CreateDirectory(directoryName);
}
File.AppendAllText(filename, "Hi");

Directory.CreateDirectory creates all directories and sub-directories, unless they already exist. This means you do not actually need to call Directory.Exists first, but that is my preference.

Answer 2

You need to create the directory ahead of time.

See. Directory.CreateDirectory