To solve the issue of Issue-6819, for SQL Server, the connection string does not enable the MultipleActiveResultSets=true feature by default.

templates/app/aspnet-core/src/MyCompanyName.MyProjectName.DbMigrator/appsettings.json

@@ -1,6 +1,6 @@
 {
   "ConnectionStrings": {
-    "Default": "Server=(LocalDb)\\MSSQLLocalDB;Database=MyProjectName;Trusted_Connection=True;MultipleActiveResultSets=true"
+    "Default": "Server=(LocalDb)\\MSSQLLocalDB;Database=MyProjectName;Trusted_Connection=True"
   },
   "IdentityServer": {
     "Clients": {

templates/app/aspnet-core/src/MyCompanyName.MyProjectName.HttpApi.Host/appsettings.json

@@ -3,7 +3,7 @@
     "CorsOrigins": "https://*.MyProjectName.com,http://localhost:4200,https://localhost:44307"
   },
   "ConnectionStrings": {
-    "Default": "Server=(LocalDb)\\MSSQLLocalDB;Database=MyProjectName;Trusted_Connection=True;MultipleActiveResultSets=true"
+    "Default": "Server=(LocalDb)\\MSSQLLocalDB;Database=MyProjectName;Trusted_Connection=True"
   },
   "Redis": {
     "Configuration": "127.0.0.1"

templates/app/aspnet-core/src/MyCompanyName.MyProjectName.HttpApi.HostWithIds/appsettings.json

@@ -5,7 +5,7 @@
     "RedirectAllowedUrls": "http://localhost:4200,https://localhost:44307"
   },
   "ConnectionStrings": {
-    "Default": "Server=(LocalDb)\\MSSQLLocalDB;Database=MyProjectName;Trusted_Connection=True;MultipleActiveResultSets=true"
+    "Default": "Server=(LocalDb)\\MSSQLLocalDB;Database=MyProjectName;Trusted_Connection=True"
   },
   "AuthServer": {
     "Authority": "https://localhost:44305",

templates/app/aspnet-core/src/MyCompanyName.MyProjectName.IdentityServer/appsettings.json

@@ -5,7 +5,7 @@
     "RedirectAllowedUrls": "http://localhost:4200,https://localhost:44307"
   },
   "ConnectionStrings": {
-    "Default": "Server=(LocalDb)\\MSSQLLocalDB;Database=MyProjectName;Trusted_Connection=True;MultipleActiveResultSets=true"
+    "Default": "Server=(LocalDb)\\MSSQLLocalDB;Database=MyProjectName;Trusted_Connection=True"
   },
   "Redis": {
     "Configuration": "127.0.0.1"

templates/app/aspnet-core/src/MyCompanyName.MyProjectName.Web/appsettings.json

@@ -3,7 +3,7 @@
     "SelfUrl": "https://localhost:44303"
   },
   "ConnectionStrings": {
-    "Default": "Server=(LocalDb)\\MSSQLLocalDB;Database=MyProjectName;Trusted_Connection=True;MultipleActiveResultSets=true"
+    "Default": "Server=(LocalDb)\\MSSQLLocalDB;Database=MyProjectName;Trusted_Connection=True"
   },
   "AuthServer": {
     "Authority": "https://localhost:44303",

templates/module/aspnet-core/host/MyCompanyName.MyProjectName.HttpApi.Host/appsettings.json

@@ -3,8 +3,8 @@
     "CorsOrigins": "https://*.MyProjectName.com,http://localhost:4200,http://localhost:44307,https://localhost:44307"
   },
   "ConnectionStrings": {
-    "Default": "Server=(LocalDb)\\MSSQLLocalDB;Database=MyProjectName_Main;Trusted_Connection=True;MultipleActiveResultSets=true",
-    "MyProjectName": "Server=(LocalDb)\\MSSQLLocalDB;Database=MyProjectName_Module;Trusted_Connection=True;MultipleActiveResultSets=true"
+    "Default": "Server=(LocalDb)\\MSSQLLocalDB;Database=MyProjectName_Main;Trusted_Connection=True",
+    "MyProjectName": "Server=(LocalDb)\\MSSQLLocalDB;Database=MyProjectName_Module;Trusted_Connection=True"
   },
   "Redis": {
     "Configuration": "127.0.0.1"

templates/module/aspnet-core/host/MyCompanyName.MyProjectName.IdentityServer/appsettings.json

@@ -5,7 +5,7 @@
   },
   "AppSelfUrl": "https://localhost:44301/",
   "ConnectionStrings": {
-    "Default": "Server=(LocalDb)\\MSSQLLocalDB;Database=MyProjectName_Main;Trusted_Connection=True;MultipleActiveResultSets=true"
+    "Default": "Server=(LocalDb)\\MSSQLLocalDB;Database=MyProjectName_Main;Trusted_Connection=True"
   },
   "Redis": {
     "Configuration": "127.0.0.1"

templates/module/aspnet-core/host/MyCompanyName.MyProjectName.Web.Unified/appsettings.json

@@ -1,5 +1,5 @@
 {
   "ConnectionStrings": {
-    "Default": "Server=(LocalDb)\\MSSQLLocalDB;Database=MyProjectName_Unified;Trusted_Connection=True;MultipleActiveResultSets=true"
+    "Default": "Server=(LocalDb)\\MSSQLLocalDB;Database=MyProjectName_Unified;Trusted_Connection=True"
   }
 }