Use IOptionsSnapshot in DefaultConnectionStringResolver to detect changes in appsettings file.

src/AbpDesk/AbpDesk.ConsoleDemo/AbpDesk/ConsoleDemo/Program.cs

@@ -1,5 +1,6 @@
 using System;
 using Microsoft.Extensions.DependencyInjection;
+using Volo.Abp;
 
 namespace AbpDesk.ConsoleDemo
 {
@@ -13,20 +14,12 @@ namespace AbpDesk.ConsoleDemo
             {
                 application.Initialize(scope.ServiceProvider);
 
-                application
-                    .ServiceProvider
-                    .GetRequiredService<TicketLister>()
-                    .List();
+                RunDemo(application);
 
-                application
-                    .ServiceProvider
-                    .GetRequiredService<UserLister>()
-                    .List();
+                Console.WriteLine("Press ENTER to run again...");
+                Console.ReadLine();
 
-                application
-                    .ServiceProvider
-                    .GetRequiredService<BlogPostLister>()
-                    .List();
+                RunDemo(application);
 
                 Console.WriteLine();
                 Console.WriteLine("Press ENTER to exit...");
@@ -35,5 +28,23 @@ namespace AbpDesk.ConsoleDemo
                 application.Shutdown();
             }
         }
+
+        private static void RunDemo(AbpApplication application)
+        {
+            application
+                .ServiceProvider
+                .GetRequiredService<TicketLister>()
+                .List();
+
+            application
+                .ServiceProvider
+                .GetRequiredService<UserLister>()
+                .List();
+
+            application
+                .ServiceProvider
+                .GetRequiredService<BlogPostLister>()
+                .List();
+        }
     }
 }

src/Volo.Abp.EntityFrameworkCore/Microsoft/Extensions/DependencyInjection/AbpEfCoreServiceCollectionExtensions.cs

@@ -15,7 +15,7 @@ namespace Microsoft.Extensions.DependencyInjection
                 .AddLogging();
 
             services.TryAddTransient<TDbContext>();
-            services.TryAddSingleton(DbContextOptionsFactory.Create<TDbContext>);
+            services.TryAddTransient(DbContextOptionsFactory.Create<TDbContext>);
 
             var options = new AbpDbContextRegistrationOptions();
             optionsBuilder?.Invoke(options);

src/Volo.Abp.MultiTenancy/Volo/Abp/Data/MultiTenancy/MultiTenantConnectionStringResolver.cs

@@ -14,7 +14,7 @@ namespace Volo.Abp.Data.MultiTenancy
         private readonly ITenantConnectionStringStore _tenantConnectionStringStore;
 
         public MultiTenantConnectionStringResolver(
-            IOptions<DbConnectionOptions> options,
+            IOptionsSnapshot<DbConnectionOptions> options,
             IMultiTenancyManager multiTenancyManager, 
             ITenantConnectionStringStore tenantConnectionStringStore)
             : base(options)

src/Volo.Abp/Volo/Abp/Data/DefaultConnectionStringResolver.cs

@@ -7,9 +7,9 @@ namespace Volo.Abp.Data
 {
     public class DefaultConnectionStringResolver : IConnectionStringResolver, ITransientDependency
     {
-        private readonly DbConnectionOptions _options; //TODO: Use IOptionsSnapshot?
+        private readonly DbConnectionOptions _options;
 
-        public DefaultConnectionStringResolver(IOptions<DbConnectionOptions> options)
+        public DefaultConnectionStringResolver(IOptionsSnapshot<DbConnectionOptions> options)
         {
             _options = options.Value;
         }