ASP.NET Core 寫入文字檔案

StackOverflow: How to write to a file in .NET Core?

大概長這樣

var logPath = System.IO.Path.GetTempFileName();
var logFile = System.IO.File.Create(logPath);
var logWriter = new System.IO.StreamWriter(logFile);
logWriter.WriteLine("Log message");
logWriter.Dispose();