AppDomain.CurrentDomain.BaseDirectory path issue when running MVC project

Question

This code creates a log file in App_Data folder. If file doesn't exist it's created. It works when the MVC page is published on my IIS.

 var filename = AppDomain.CurrentDomain.BaseDirectory + 
                "App_Data//" + 
                label + 
                DateTime.Now.ToString() + 
                ".txt";

 var sw = new System.IO.StreamWriter(filename, true);

However when i run the project local, i get :

NotSupportedException. the StreamWriter says that my path is not supported. This is the path im getting:

"C:\\Projects\\x- chefsportalen 2.0\\Chefsportalen\\App_Data//Paragå manuell2015-05-18 11:00:18.txt"

The App_Data folder exist and the path is correct, why am i getting this error?

Answer 1

Filenames are not allowed to contain the ":" character.

Use an explicit format string to specify a format that doesn't contain ":", eg

DateTime.Now.ToString("yyyy-MM-dd HH-mm-ss", CultureInfo.InvariantCulture)

I'm not sure why it's working when you publish to IIS - maybe because IIS is using a culture that doesn't have ":" as time separator.