C＃控制台应用程序在通过命令行调用时不会写入文件，但否则会写入文件

Question

I have a small console app that takes parameters. Througout i use a method to throw some info into a file as a log. Very simple:

        static void Log(string str)
        {
            using (StreamWriter sw = new StreamWriter("log.txt", true))
            {
                sw.WriteLine(str);
            }
        }

However, when this program is run by command line invocation, the program runs but the log file isnt amended.

If the app is run by launching via explorer or debugging in visual studio the logging works.

Any ideas?

Answer 1

尝试定义完整的写入路径，例如： C:\\Users\\user\\Documents\\log.txt

Answer 2

new StreamWriter("log.txt", true) writes to the current working directory, which could be anywhere at all, including network shares or places you do not have write access to. Always specify the full path to any files. If you want to write to a file you need to make sure you write to a place you have access to. Do not just run your app as Administrator, that opens all kinds of security holes.

You probably want something like:

var p = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "myAppName");
if (!Directory.Exists(p)) Directory.CreateDirectory(p);
using (var sw = new StreamWriter(Path.Combine(p, "log.txt"), true)
{
    sw.WriteLine(str);
}