diff --git a/src/Volo.Abp/Volo/Abp/Localization/AbpStringLocalizerFactory.cs b/src/Volo.Abp/Volo/Abp/Localization/AbpStringLocalizerFactory.cs
index 2d838e3b19..64e617929d 100644
--- a/src/Volo.Abp/Volo/Abp/Localization/AbpStringLocalizerFactory.cs
+++ b/src/Volo.Abp/Volo/Abp/Localization/AbpStringLocalizerFactory.cs
@@ -51,7 +51,7 @@ namespace Volo.Abp.Localization
             
             //Notes: Localizer will be cached, so wrappers are responsible to cache/invalidate themselves!
 
-            var localizer = new AbpDictionaryBasedStringLocalizer(resource); //TODO: !!!
+            var localizer = new AbpDictionaryBasedStringLocalizer(resource);
 
             //TODO: Wrap with DB provider or other premium sources
 
diff --git a/src/Volo.Abp/Volo/Abp/Localization/ILocalizationDictionaryProvider.cs b/src/Volo.Abp/Volo/Abp/Localization/ILocalizationDictionaryProvider.cs
index 1da13bcafb..8a133825db 100644
--- a/src/Volo.Abp/Volo/Abp/Localization/ILocalizationDictionaryProvider.cs
+++ b/src/Volo.Abp/Volo/Abp/Localization/ILocalizationDictionaryProvider.cs
@@ -6,7 +6,7 @@ namespace Volo.Abp.Localization
     {
         IDictionary<string, ILocalizationDictionary> Dictionaries { get; }
 
-        void Initialize(LocalizationResource resource);
+        void Initialize();
         
         void Extend(ILocalizationDictionary dictionary);
     }
diff --git a/src/Volo.Abp/Volo/Abp/Localization/Json/JsonEmbeddedFileLocalizationDictionaryProvider.cs b/src/Volo.Abp/Volo/Abp/Localization/Json/JsonEmbeddedFileLocalizationDictionaryProvider.cs
index d374fda2cf..2a4cb2758f 100644
--- a/src/Volo.Abp/Volo/Abp/Localization/Json/JsonEmbeddedFileLocalizationDictionaryProvider.cs
+++ b/src/Volo.Abp/Volo/Abp/Localization/Json/JsonEmbeddedFileLocalizationDictionaryProvider.cs
@@ -17,7 +17,7 @@ namespace Volo.Abp.Localization.Json
             _rootNamespace = rootNamespace;
         }
 
-        public override void Initialize(LocalizationResource resource)
+        public override void Initialize()
         {
             var resourceNames = _assembly.GetManifestResourceNames();
             foreach (var resourceName in resourceNames)
@@ -31,7 +31,7 @@ namespace Volo.Abp.Localization.Json
                         var dictionary = CreateJsonLocalizationDictionary(jsonString);
                         if (Dictionaries.ContainsKey(dictionary.CultureName))
                         {
-                            throw new AbpException(resource.ResourceType.FullName + " source contains more than one dictionary for the culture: " + dictionary.CultureName);
+                            throw new AbpException($"{resourceName} dictionary has a culture name '{dictionary.CultureName}' which is already defined!");
                         }
 
                         Dictionaries[dictionary.CultureName] = dictionary;
@@ -40,9 +40,9 @@ namespace Volo.Abp.Localization.Json
             }
         }
 
-        protected virtual JsonLocalizationDictionary CreateJsonLocalizationDictionary(string jsonString)
+        protected virtual ILocalizationDictionary CreateJsonLocalizationDictionary(string jsonString)
         {
-            return JsonLocalizationDictionary.BuildFromJsonString(jsonString);
+            return JsonLocalizationDictionaryBuilder.BuildFromJsonString(jsonString);
         }
     }
 }
\ No newline at end of file
diff --git a/src/Volo.Abp/Volo/Abp/Localization/Json/JsonLocalizationDictionary.cs b/src/Volo.Abp/Volo/Abp/Localization/Json/JsonLocalizationDictionaryBuilder.cs
similarity index 74%
rename from src/Volo.Abp/Volo/Abp/Localization/Json/JsonLocalizationDictionary.cs
rename to src/Volo.Abp/Volo/Abp/Localization/Json/JsonLocalizationDictionaryBuilder.cs
index 7a13c5eb05..ccc1324f5d 100644
--- a/src/Volo.Abp/Volo/Abp/Localization/Json/JsonLocalizationDictionary.cs
+++ b/src/Volo.Abp/Volo/Abp/Localization/Json/JsonLocalizationDictionaryBuilder.cs
@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Globalization;
 using System.IO;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Serialization;
@@ -13,22 +12,13 @@ namespace Volo.Abp.Localization.Json
     /// <remarks>
     ///     Use static Build methods to create instance of this class.
     /// </remarks>
-    public class JsonLocalizationDictionary : LocalizationDictionary
+    public class JsonLocalizationDictionaryBuilder
     {
         /// <summary>
-        ///     Private constructor.
-        /// </summary>
-        /// <param name="cultureName">Culture of the dictionary</param>
-        private JsonLocalizationDictionary(string cultureName)
-            : base(cultureName)
-        {
-        }
-
-        /// <summary>
-        ///     Builds an <see cref="JsonLocalizationDictionary" /> from given file.
+        ///     Builds an <see cref="JsonLocalizationDictionaryBuilder" /> from given file.
         /// </summary>
         /// <param name="filePath">Path of the file</param>
-        public static JsonLocalizationDictionary BuildFromFile(string filePath)
+        public static ILocalizationDictionary BuildFromFile(string filePath)
         {
             try
             {
@@ -41,10 +31,10 @@ namespace Volo.Abp.Localization.Json
         }
 
         /// <summary>
-        ///     Builds an <see cref="JsonLocalizationDictionary" /> from given json string.
+        ///     Builds an <see cref="JsonLocalizationDictionaryBuilder" /> from given json string.
         /// </summary>
         /// <param name="jsonString">Json string</param>
-        public static JsonLocalizationDictionary BuildFromJsonString(string jsonString)
+        public static ILocalizationDictionary BuildFromJsonString(string jsonString)
         {
             JsonLocalizationFile jsonFile;
             try
@@ -67,7 +57,7 @@ namespace Volo.Abp.Localization.Json
                 throw new AbpException("Culture is empty in language json file.");
             }
 
-            var dictionary = new JsonLocalizationDictionary(cultureCode);
+            var dictionary = new LocalizationDictionary(cultureCode);
             var dublicateNames = new List<string>();
             foreach (var item in jsonFile.Texts)
             {
@@ -76,7 +66,7 @@ namespace Volo.Abp.Localization.Json
                     throw new AbpException("The key is empty in given json string.");
                 }
 
-                if (dictionary.Contains(item.Key))
+                if (dictionary.GetOrNull(item.Key) != null)
                 {
                     dublicateNames.Add(item.Key);
                 }
diff --git a/src/Volo.Abp/Volo/Abp/Localization/LocalizationDictionary.cs b/src/Volo.Abp/Volo/Abp/Localization/LocalizationDictionary.cs
index 7bb7217549..700633ce22 100644
--- a/src/Volo.Abp/Volo/Abp/Localization/LocalizationDictionary.cs
+++ b/src/Volo.Abp/Volo/Abp/Localization/LocalizationDictionary.cs
@@ -1,7 +1,6 @@
 using System.Collections;
 using System.Collections.Generic;
 using System.Collections.Immutable;
-using System.Globalization;
 
 namespace Volo.Abp.Localization
 {
@@ -11,17 +10,13 @@ namespace Volo.Abp.Localization
     public class LocalizationDictionary : ILocalizationDictionary, IEnumerable<LocalString>
     {
         /// <inheritdoc/>
-        public string CultureName { get; private set; }
+        public string CultureName { get; }
 
         /// <inheritdoc/>
         public virtual LocalString this[string name]
         {
-            get
-            {
-                var localizedString = GetOrNull(name);
-                return localizedString == null ? null : localizedString;
-            }
-            set { _dictionary[name] = value; }
+            get => GetOrNull(name);
+            set => _dictionary[name] = value;
         }
 
         private readonly Dictionary<string, LocalString> _dictionary;
@@ -39,8 +34,7 @@ namespace Volo.Abp.Localization
         /// <inheritdoc/>
         public virtual LocalString GetOrNull(string name)
         {
-            LocalString localizedString;
-            return _dictionary.TryGetValue(name, out localizedString) ? localizedString : null;
+            return _dictionary.GetOrDefault(name);
         }
 
         /// <inheritdoc/>
diff --git a/src/Volo.Abp/Volo/Abp/Localization/LocalizationDictionaryProviderBase.cs b/src/Volo.Abp/Volo/Abp/Localization/LocalizationDictionaryProviderBase.cs
index 21dd462f28..622d946226 100644
--- a/src/Volo.Abp/Volo/Abp/Localization/LocalizationDictionaryProviderBase.cs
+++ b/src/Volo.Abp/Volo/Abp/Localization/LocalizationDictionaryProviderBase.cs
@@ -4,20 +4,17 @@ namespace Volo.Abp.Localization
 {
     public abstract class LocalizationDictionaryProviderBase : ILocalizationDictionaryProvider
     {
-        public LocalizationResource ResourceType { get; private set; }
-
         public ILocalizationDictionary DefaultDictionary { get; protected set; }
 
-        public IDictionary<string, ILocalizationDictionary> Dictionaries { get; private set; }
+        public IDictionary<string, ILocalizationDictionary> Dictionaries { get; }
 
         protected LocalizationDictionaryProviderBase()
         {
             Dictionaries = new Dictionary<string, ILocalizationDictionary>();
         }
 
-        public virtual void Initialize(LocalizationResource resourceType)
+        public virtual void Initialize()
         {
-            ResourceType = resourceType;
         }
 
         public void Extend(ILocalizationDictionary dictionary)
diff --git a/src/Volo.Abp/Volo/Abp/Localization/LocalizationResource.cs b/src/Volo.Abp/Volo/Abp/Localization/LocalizationResource.cs
index 38e6120bb1..dd44c67166 100644
--- a/src/Volo.Abp/Volo/Abp/Localization/LocalizationResource.cs
+++ b/src/Volo.Abp/Volo/Abp/Localization/LocalizationResource.cs
@@ -33,7 +33,7 @@ namespace Volo.Abp.Localization
 
         public virtual void Initialize(IServiceProvider serviceProvider) //TODO: Create a LocalizationResourceInitializationContext!
         {
-            DictionaryProvider.Initialize(this);
+            DictionaryProvider.Initialize();
         }
     }
 }
\ No newline at end of file