Setting the full path to load the Config.json.

Specifying just the name of the file works fine on selfhost or IISExpress. When app is hosted in IIS, Config.json is being searched in the w3wp3.exe's folder path resulting in an exception.
So fixing the path of Config.json by retrieving the application base path from AppDomain.

src/MusicStore/Startup.cs

@@ -15,6 +15,8 @@ using MusicStore.Models;
 using MusicStore.Web.Models;
 using System;
 using System.Collections.Generic;
+using System.IO;
+using System.Reflection;
 
 public class Startup
 {
@@ -52,8 +54,8 @@ public class Startup
     {
         var configuration = new Configuration();
         configuration.AddEnvironmentVariables(); //If configuration flows through environment we should pick that first
-        configuration.AddJsonFile("Config.json");
-        
+        configuration.AddJsonFile(Path.Combine(GetApplicationBasePath(), "Config.json"));
+
         string _username = configuration.Get("DefaultAdminUsername");
         string _password = configuration.Get("DefaultAdminPassword");
         string _role = "Administrator";
@@ -76,4 +78,28 @@ public class Startup
             await userManager.AddToRoleAsync(user, _role);
         }
     }
+
+    //To find the application base path at runtime. 
+    private static string GetApplicationBasePath()
+    {
+#if NET45
+            var applicationBase = AppDomain.CurrentDomain.SetupInformation.ApplicationBase;
+#else // CORECLR_TODO: ApplicationBase
+        var appDomainType = typeof(object)
+                                .GetTypeInfo()
+                                .Assembly
+                                .GetType("System.AppDomain");
+
+        var currentAppDomainProperty = appDomainType.GetRuntimeProperty("CurrentDomain");
+
+        var currentAppDomain = currentAppDomainProperty.GetValue(null);
+
+        var getDataMethod = appDomainType
+            .GetRuntimeMethod("GetData", new[] { typeof(string) });
+
+        string applicationBase = (string)getDataMethod.Invoke(currentAppDomain, new object[] { "APPBASE" });
+#endif
+
+        return applicationBase;
+    }
 }

src/MusicStore/project.json

@@ -50,7 +50,10 @@
                 "System.Console": "4.0.0.0",
                 "System.Diagnostics.Debug": "4.0.10.0",
                 "System.Diagnostics.Tools": "4.0.0.0",
-                "Microsoft.ComponentModel.DataAnnotations": "4.0.10.0"
+                "Microsoft.ComponentModel.DataAnnotations": "4.0.10.0",
+				"System.Reflection": "4.0.10.0",
+				"System.Reflection.Extensions": "4.0.0.0",
+				"System.IO": "4.0.0.0"
             }
         }
     }