...

PhotoRenamer/PhotoRenamer.csproj

@@ -13,6 +13,7 @@
     <PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="3.1.4" />
     <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="3.1.4" />
     <PackageReference Include="Microsoft.Extensions.Logging" Version="3.1.4" />
+    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="3.1.4" />
   </ItemGroup>
 
 </Project>

PhotoRenamer/Program.cs

@@ -1,19 +1,35 @@
 using System;
 using System.IO;
-using System.Threading.Tasks;
 using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Logging;
 
 namespace PhotoRenamer
 {
-    class Program
+    internal static class Program
     {
-        private static async Task Main(string[] args)
+        private static int Main(string[] args)
         {
-            var Configuration = new ConfigurationBuilder()
-                .SetBasePath(Directory.GetCurrentDirectory())
-                .AddJsonFile(AppDomain.CurrentDomain.BaseDirectory + "\\appsettings.json", optional: true, reloadOnChange: true)
-                .AddEnvironmentVariables()
-                .Build();                     
+            var configuration = CreateHostBuilder(args).Build();
+            var loggerFactory = LoggerFactory.Create(builder => builder.AddConsole());
+            var logger = loggerFactory.CreateLogger(nameof(Program));
+            try
+            {
+                var p = new Renamer(configuration, loggerFactory);
+                return p.Run();
+            }
+            catch (Exception e)
+            {
+                logger.LogError(e, "Error executing program");
+                return -1;
+            }
         }
+
+        public static IConfigurationBuilder CreateHostBuilder(string[] args) => new ConfigurationBuilder()
+            .SetBasePath(Directory.GetCurrentDirectory())
+            .AddJsonFile(AppDomain.CurrentDomain.BaseDirectory + "\\appsettings.json", optional: true,
+                reloadOnChange: true)
+            .AddEnvironmentVariables()
+            .AddCommandLine(args);
+
     }
 }

PhotoRenamer/Renamer.cs

@@ -0,0 +1,27 @@
+using System;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Logging;
+
+namespace PhotoRenamer
+{
+    internal class Renamer
+    {
+        private readonly IConfigurationRoot _configuration;
+        private readonly ILogger<Renamer> _logger;
+
+        public Renamer(IConfigurationRoot configuration, ILoggerFactory loggerFactory)
+        {
+            _configuration = configuration;
+            _logger = loggerFactory.CreateLogger<Renamer>();
+        }
+
+        public int Run()
+        {
+            var sourcePath = _configuration["Source"];
+            var targetPath = _configuration["Target"];
+            _logger.LogInformation($"Source path {sourcePath}");
+            _logger.LogInformation($"Target path {targetPath}");
+            return 0;
+        }
+    }
+}

PhotoRenamer/appsettings.json

@@ -0,0 +1,2 @@
+{
+}