how to save and open your own file C#

Question

When I press the save button in my program, I want to save a file with my own extension. (Example .xyz)

Then I want to open it and read the data inside it through this program.

How I can achieve this?

Answer 1

When I press the save button in my program, I want to save a file with my own extension. (Example .xyz). Do the following:

const string directory = @"D:\Temp"; // this can be any location you want

if (!Directory.Exists(directory))
    Directory.CreateDirectory(directory);

string path = Path.Combine(directory, "Test.custom");
if (!File.Exists(path))
{
    File.Create(path);

    // other logic
}

Then I want to open it and read the data inside it through this program.

string textFile = @"D:\Torrent\Test.custom";

using StreamReader sr = new StreamReader(textFile);
var line = sr.ReadToEnd();
Console.WriteLine(line);

If you want later to save something in the file, the easiest way to do is this:

const string textFile = @"D:\Torrent\Test.custom";
string createText = $"Some text {Environment.NewLine}";
File.WriteAllText(textFile, createText);