Creating a named .txt file and subsequently writing string to it in C#

Question

I have been tasked to build a WPF App which uses a user input form to gather information, and then save the information as string in a text file, whose name is created as a result of user input. The UI and user input are working, but the string will not save to the text file. Whenever the code is debugged it throws a "file path not supported exception".

This is the code for my writing to the file:

System.IO.File.WriteAllLines("C:\\Users\\jhump\\Desktop\\TestingApp\\"+filename+"\\", data);

Where data is a string array containing the string to be saved, and filename is the concatted name for the file to be saved as.

Thank you in advance for your help!

Answer 1

You need to escape \\ characters by using an extra backslash like this \\\\ . Also you can use String Literals , like @"C:\\Users\\..." instead if you don't want to use double backslashes.

string[] data = { "Some", "Thing", "Foo", "Bar" };
string filename = "foo.txt";

System.IO.File.WriteAllLines("C:\\Users\\jhump\\Desktop\\TestingApp\\" + filename, data);

Answer 2

You have to concat the names of the directory or either escape the \\ backslash:

...WriteAllLines(@"C:\\yourpath\\here\\filename.txt",data)

best way for the user home folder is to use special folder paths:

Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments)