Resolved #3967: Fallback to the default localization resource for base classes with the L property

framework/src/Volo.Abp.AspNetCore.Mvc.UI/Volo/Abp/AspNetCore/Mvc/UI/RazorPages/AbpPageModel.cs

@@ -98,22 +98,6 @@ namespace Volo.Abp.AspNetCore.Mvc.UI.RazorPages
             }
         }
 
-        protected virtual IStringLocalizer CreateLocalizer()
-        {
-            if (LocalizationResourceType != null)
-            {
-                return StringLocalizerFactory.Create(LocalizationResourceType);
-            }
-
-            var localizer = StringLocalizerFactory.CreateDefaultOrNull();
-            if (localizer == null)
-            {
-                throw new AbpException($"Set {nameof(LocalizationResourceType)} or define the default localization resource type (by configuring the {nameof(AbpLocalizationOptions)}.{nameof(AbpLocalizationOptions.DefaultResourceType)}) to be able to use the {nameof(L)} object!");
-            }
-
-            return localizer;
-        }
-
         private IStringLocalizer _localizer;
 
         protected Type LocalizationResourceType { get; set; }
@@ -165,5 +149,21 @@ namespace Volo.Abp.AspNetCore.Mvc.UI.RazorPages
                 TempData = TempData
             };
         }
+
+        protected virtual IStringLocalizer CreateLocalizer()
+        {
+            if (LocalizationResourceType != null)
+            {
+                return StringLocalizerFactory.Create(LocalizationResourceType);
+            }
+
+            var localizer = StringLocalizerFactory.CreateDefaultOrNull();
+            if (localizer == null)
+            {
+                throw new AbpException($"Set {nameof(LocalizationResourceType)} or define the default localization resource type (by configuring the {nameof(AbpLocalizationOptions)}.{nameof(AbpLocalizationOptions.DefaultResourceType)}) to be able to use the {nameof(L)} object!");
+            }
+
+            return localizer;
+        }
     }
 }

framework/src/Volo.Abp.AspNetCore.Mvc/Volo/Abp/AspNetCore/Mvc/AbpController.cs

@@ -101,7 +101,18 @@ namespace Volo.Abp.AspNetCore.Mvc
         public IStringLocalizerFactory StringLocalizerFactory => LazyGetRequiredService(ref _stringLocalizerFactory);
         private IStringLocalizerFactory _stringLocalizerFactory;
 
-        public IStringLocalizer L => _localizer ?? (_localizer = StringLocalizerFactory.Create(LocalizationResource));
+        public IStringLocalizer L
+        {
+            get
+            {
+                if (_localizer == null)
+                {
+                    _localizer = CreateLocalizer();
+                }
+
+                return _localizer;
+            }
+        }
         private IStringLocalizer _localizer;
 
         protected Type LocalizationResource
@@ -121,5 +132,21 @@ namespace Volo.Abp.AspNetCore.Mvc
         {
             ModelValidator?.Validate(ModelState);
         }
+
+        protected virtual IStringLocalizer CreateLocalizer()
+        {
+            if (LocalizationResource != null)
+            {
+                return StringLocalizerFactory.Create(LocalizationResource);
+            }
+
+            var localizer = StringLocalizerFactory.CreateDefaultOrNull();
+            if (localizer == null)
+            {
+                throw new AbpException($"Set {nameof(LocalizationResource)} or define the default localization resource type (by configuring the {nameof(AbpLocalizationOptions)}.{nameof(AbpLocalizationOptions.DefaultResourceType)}) to be able to use the {nameof(L)} object!");
+            }
+
+            return localizer;
+        }
     }
 }

framework/src/Volo.Abp.AspNetCore.SignalR/Volo/Abp/AspNetCore/SignalR/AbpHub.cs

@@ -57,7 +57,18 @@ namespace Volo.Abp.AspNetCore.SignalR
         public IStringLocalizerFactory StringLocalizerFactory => LazyGetRequiredService(ref _stringLocalizerFactory);
         private IStringLocalizerFactory _stringLocalizerFactory;
 
-        public IStringLocalizer L => _localizer ?? (_localizer = StringLocalizerFactory.Create(LocalizationResource));
+        public IStringLocalizer L
+        {
+            get
+            {
+                if (_localizer == null)
+                {
+                    _localizer = CreateLocalizer();
+                }
+
+                return _localizer;
+            }
+        }
         private IStringLocalizer _localizer;
 
         protected Type LocalizationResource
@@ -70,6 +81,22 @@ namespace Volo.Abp.AspNetCore.SignalR
             }
         }
         private Type _localizationResource = typeof(DefaultResource);
+
+        protected virtual IStringLocalizer CreateLocalizer()
+        {
+            if (LocalizationResource != null)
+            {
+                return StringLocalizerFactory.Create(LocalizationResource);
+            }
+
+            var localizer = StringLocalizerFactory.CreateDefaultOrNull();
+            if (localizer == null)
+            {
+                throw new AbpException($"Set {nameof(LocalizationResource)} or define the default localization resource type (by configuring the {nameof(AbpLocalizationOptions)}.{nameof(AbpLocalizationOptions.DefaultResourceType)}) to be able to use the {nameof(L)} object!");
+            }
+
+            return localizer;
+        }
     }
 
     public abstract class AbpHub<T> : Hub<T> 
@@ -118,7 +145,18 @@ namespace Volo.Abp.AspNetCore.SignalR
         public IStringLocalizerFactory StringLocalizerFactory => LazyGetRequiredService(ref _stringLocalizerFactory);
         private IStringLocalizerFactory _stringLocalizerFactory;
 
-        public IStringLocalizer L => _localizer ?? (_localizer = StringLocalizerFactory.Create(LocalizationResource));
+        public IStringLocalizer L
+        {
+            get
+            {
+                if (_localizer == null)
+                {
+                    _localizer = CreateLocalizer();
+                }
+
+                return _localizer;
+            }
+        }
         private IStringLocalizer _localizer;
 
         protected Type LocalizationResource
@@ -131,5 +169,21 @@ namespace Volo.Abp.AspNetCore.SignalR
             }
         }
         private Type _localizationResource = typeof(DefaultResource);
+
+        protected virtual IStringLocalizer CreateLocalizer()
+        {
+            if (LocalizationResource != null)
+            {
+                return StringLocalizerFactory.Create(LocalizationResource);
+            }
+
+            var localizer = StringLocalizerFactory.CreateDefaultOrNull();
+            if (localizer == null)
+            {
+                throw new AbpException($"Set {nameof(LocalizationResource)} or define the default localization resource type (by configuring the {nameof(AbpLocalizationOptions)}.{nameof(AbpLocalizationOptions.DefaultResourceType)}) to be able to use the {nameof(L)} object!");
+            }
+
+            return localizer;
+        }
     }
 }

framework/src/Volo.Abp.Ddd.Application/Volo/Abp/Application/Services/ApplicationService.cs

@@ -109,7 +109,18 @@ namespace Volo.Abp.Application.Services
         public IStringLocalizerFactory StringLocalizerFactory => LazyGetRequiredService(ref _stringLocalizerFactory);
         private IStringLocalizerFactory _stringLocalizerFactory;
 
-        public IStringLocalizer L => _localizer ?? (_localizer = StringLocalizerFactory.Create(LocalizationResource));
+        public IStringLocalizer L
+        {
+            get
+            {
+                if (_localizer == null)
+                {
+                    _localizer = CreateLocalizer();
+                }
+
+                return _localizer;
+            }
+        }
         private IStringLocalizer _localizer;
 
         protected Type LocalizationResource
@@ -147,5 +158,21 @@ namespace Volo.Abp.Application.Services
 
             await AuthorizationService.CheckAsync(policyName);
         }
+
+        protected virtual IStringLocalizer CreateLocalizer()
+        {
+            if (LocalizationResource != null)
+            {
+                return StringLocalizerFactory.Create(LocalizationResource);
+            }
+
+            var localizer = StringLocalizerFactory.CreateDefaultOrNull();
+            if (localizer == null)
+            {
+                throw new AbpException($"Set {nameof(LocalizationResource)} or define the default localization resource type (by configuring the {nameof(AbpLocalizationOptions)}.{nameof(AbpLocalizationOptions.DefaultResourceType)}) to be able to use the {nameof(L)} object!");
+            }
+
+            return localizer;
+        }
     }
 }