.NET Standard 2.0 Cookbook

How to do it...

1. Open Visual Studio 2017.
2. Now, open the solution from the previous recipe. Click File | Open | Open Project/Solution, or press Ctrl + Shift + O, and select the Chapter10.Logging solution. 
3. Press Ctrl + Shift + B for a quick build to check that everything is fine. 

4. The Solution Explorer should look like this:

5. Now, double-click on the LoggerDemo.cs label to open the code window.
6. Scroll down until you reach the WriteLog() method.
7. Replace the current code with the following:

      try      {          if (!File.Exists(logFileName))          {              logFile = File.CreateText(logFileName);          }          else          {              logFile = File.AppendText(logFileName);          } logFile.WriteLine($"{DateTime.Now} ...