Improved code for reading appsettings.json

vs4win/Chapter04/Instrumenting/Program.cs

@@ -1,6 +1,13 @@
 using System.Diagnostics;
+using System.Reflection;
 using Microsoft.Extensions.Configuration;
 
+Console.WriteLine("Warning! Versions 7.0.3xx and 7.0.4xx have bugs that cause an exception:");
+Console.WriteLine("Microsoft.Extensions.Configuration.Binder version: {0}", 
+  typeof(ConfigurationBinder).Assembly.GetCustomAttribute
+  <AssemblyFileVersionAttribute>()?.Version);
+Console.WriteLine();
+
 string logPath = Path.Combine(Environment.GetFolderPath(
     Environment.SpecialFolder.DesktopDirectory), "log.txt");
 
@@ -10,8 +17,8 @@
 
 Trace.Listeners.Add(logFile);
 
-// text writer is buffered, so this option calls
-// Flush() on all listeners after writing
+// Text writer is buffered, so this option calls
+// Flush() on all listeners after writing.
 Trace.AutoFlush = true;
 
 Debug.WriteLine("Debug says, I am watching!");
@@ -20,10 +27,18 @@
 Console.WriteLine("Reading from appsettings.json in {0}",
   arg0: Directory.GetCurrentDirectory());
 
+Console.WriteLine();
+Console.WriteLine("--appsettings.json contents--");
+Console.WriteLine(File.ReadAllText(Path.Combine(
+  Directory.GetCurrentDirectory(), "appsettings.json")));
+
 ConfigurationBuilder builder = new();
 
 builder.SetBasePath(Directory.GetCurrentDirectory());
 
+// Add the appsettings.json file to the processed configuration.
+// Make reading this file mandatory so an exception will be thrown
+// if the file is not found.
 builder.AddJsonFile("appsettings.json",
   optional: false, reloadOnChange: true);
 
@@ -35,6 +50,9 @@
 
 configuration.GetSection("PacktSwitch").Bind(ts);
 
+// Output the trace switch level from appsettings.json.
+Console.WriteLine($"Trace switch level: {ts.Level}");
+
 Trace.WriteLineIf(ts.TraceError, "Trace error");
 Trace.WriteLineIf(ts.TraceWarning, "Trace warning");
 Trace.WriteLineIf(ts.TraceInfo, "Trace information");
@@ -43,4 +61,5 @@
 int unitsInStock = 12;
 LogSourceDetails(unitsInStock > 10);
 
+Console.WriteLine("Press enter to exit.");
 Console.ReadLine();

vscode/Chapter04/Instrumenting/Program.cs

@@ -1,6 +1,13 @@
 using System.Diagnostics;
+using System.Reflection;
 using Microsoft.Extensions.Configuration;
 
+Console.WriteLine("Warning! Versions 7.0.3xx and 7.0.4xx have bugs that cause an exception:");
+Console.WriteLine("Microsoft.Extensions.Configuration.Binder version: {0}", 
+  typeof(ConfigurationBinder).Assembly.GetCustomAttribute
+  <AssemblyFileVersionAttribute>()?.Version);
+Console.WriteLine();
+
 string logPath = Path.Combine(Environment.GetFolderPath(
     Environment.SpecialFolder.DesktopDirectory), "log.txt");
 
@@ -10,8 +17,8 @@
 
 Trace.Listeners.Add(logFile);
 
-// text writer is buffered, so this option calls
-// Flush() on all listeners after writing
+// Text writer is buffered, so this option calls
+// Flush() on all listeners after writing.
 Trace.AutoFlush = true;
 
 Debug.WriteLine("Debug says, I am watching!");
@@ -20,10 +27,18 @@
 Console.WriteLine("Reading from appsettings.json in {0}",
   arg0: Directory.GetCurrentDirectory());
 
+Console.WriteLine();
+Console.WriteLine("--appsettings.json contents--");
+Console.WriteLine(File.ReadAllText(Path.Combine(
+  Directory.GetCurrentDirectory(), "appsettings.json")));
+
 ConfigurationBuilder builder = new();
 
 builder.SetBasePath(Directory.GetCurrentDirectory());
 
+// Add the appsettings.json file to the processed configuration.
+// Make reading this file mandatory so an exception will be thrown
+// if the file is not found.
 builder.AddJsonFile("appsettings.json",
   optional: false, reloadOnChange: true);
 
@@ -35,6 +50,9 @@
 
 configuration.GetSection("PacktSwitch").Bind(ts);
 
+// Output the trace switch level from appsettings.json.
+Console.WriteLine($"Trace switch level: {ts.Level}");
+
 Trace.WriteLineIf(ts.TraceError, "Trace error");
 Trace.WriteLineIf(ts.TraceWarning, "Trace warning");
 Trace.WriteLineIf(ts.TraceInfo, "Trace information");
@@ -43,4 +61,5 @@
 int unitsInStock = 12;
 LogSourceDetails(unitsInStock > 10);
 
+Console.WriteLine("Press enter to exit.");
 Console.ReadLine();