diff --git a/framework/src/Volo.Abp.Ddd.Domain/Volo/Abp/Domain/Repositories/RepositoryBase.cs b/framework/src/Volo.Abp.Ddd.Domain/Volo/Abp/Domain/Repositories/RepositoryBase.cs
index db0ec2b11c..1d4e6e6771 100644
--- a/framework/src/Volo.Abp.Ddd.Domain/Volo/Abp/Domain/Repositories/RepositoryBase.cs
+++ b/framework/src/Volo.Abp.Ddd.Domain/Volo/Abp/Domain/Repositories/RepositoryBase.cs
@@ -6,9 +6,7 @@ using System.Linq;
 using System.Linq.Expressions;
 using System.Threading;
 using System.Threading.Tasks;
-using Volo.Abp.Data;
 using Volo.Abp.Domain.Entities;
-using Volo.Abp.Linq;
 using Volo.Abp.MultiTenancy;
 using Volo.Abp.Uow;
 
diff --git a/framework/src/Volo.Abp.MemoryDb/Volo/Abp/Domain/Repositories/MemoryDb/MemoryDbRepository.cs b/framework/src/Volo.Abp.MemoryDb/Volo/Abp/Domain/Repositories/MemoryDb/MemoryDbRepository.cs
index 7c67e254ee..996143069d 100644
--- a/framework/src/Volo.Abp.MemoryDb/Volo/Abp/Domain/Repositories/MemoryDb/MemoryDbRepository.cs
+++ b/framework/src/Volo.Abp.MemoryDb/Volo/Abp/Domain/Repositories/MemoryDb/MemoryDbRepository.cs
@@ -28,23 +28,19 @@ namespace Volo.Abp.Domain.Repositories.MemoryDb
 
         protected IMemoryDatabaseProvider<TMemoryDbContext> DatabaseProvider { get; }
 
-        public ILocalEventBus LocalEventBus { get; set; }
+        public ILocalEventBus LocalEventBus => LazyServiceProvider.LazyGetService<ILocalEventBus>(NullLocalEventBus.Instance);
 
-        public IDistributedEventBus DistributedEventBus { get; set; }
+        public IDistributedEventBus DistributedEventBus => LazyServiceProvider.LazyGetService<IDistributedEventBus>(NullDistributedEventBus.Instance);
 
-        public IEntityChangeEventHelper EntityChangeEventHelper { get; set; }
+        public IEntityChangeEventHelper EntityChangeEventHelper => LazyServiceProvider.LazyGetService<IEntityChangeEventHelper>(NullEntityChangeEventHelper.Instance);
 
-        public IAuditPropertySetter AuditPropertySetter { get; set; }
+        public IGuidGenerator GuidGenerator => LazyServiceProvider.LazyGetService<IGuidGenerator>(SimpleGuidGenerator.Instance);
 
-        public IGuidGenerator GuidGenerator { get; set; }
+        public IAuditPropertySetter AuditPropertySetter => LazyServiceProvider.LazyGetRequiredService<IAuditPropertySetter>();
 
         public MemoryDbRepository(IMemoryDatabaseProvider<TMemoryDbContext> databaseProvider)
         {
             DatabaseProvider = databaseProvider;
-
-            LocalEventBus = NullLocalEventBus.Instance;
-            DistributedEventBus = NullDistributedEventBus.Instance;
-            EntityChangeEventHelper = NullEntityChangeEventHelper.Instance;
         }
 
         protected override IQueryable<TEntity> GetQueryable()
diff --git a/framework/src/Volo.Abp.MongoDB/Volo/Abp/Domain/Repositories/MongoDB/MongoDbRepository.cs b/framework/src/Volo.Abp.MongoDB/Volo/Abp/Domain/Repositories/MongoDB/MongoDbRepository.cs
index 109aeac8cd..43fdf4649b 100644
--- a/framework/src/Volo.Abp.MongoDB/Volo/Abp/Domain/Repositories/MongoDB/MongoDbRepository.cs
+++ b/framework/src/Volo.Abp.MongoDB/Volo/Abp/Domain/Repositories/MongoDB/MongoDbRepository.cs
@@ -37,29 +37,24 @@ namespace Volo.Abp.Domain.Repositories.MongoDB
 
         protected IMongoDbContextProvider<TMongoDbContext> DbContextProvider { get; }
 
-        public ILocalEventBus LocalEventBus { get; set; }
+        public ILocalEventBus LocalEventBus => LazyServiceProvider.LazyGetService<ILocalEventBus>(NullLocalEventBus.Instance);
 
-        public IDistributedEventBus DistributedEventBus { get; set; }
+        public IDistributedEventBus DistributedEventBus => LazyServiceProvider.LazyGetService<IDistributedEventBus>(NullDistributedEventBus.Instance);
 
-        public IEntityChangeEventHelper EntityChangeEventHelper { get; set; }
+        public IEntityChangeEventHelper EntityChangeEventHelper => LazyServiceProvider.LazyGetService<IEntityChangeEventHelper>(NullEntityChangeEventHelper.Instance);
 
-        public IGuidGenerator GuidGenerator { get; set; }
+        public IGuidGenerator GuidGenerator => LazyServiceProvider.LazyGetService<IGuidGenerator>(SimpleGuidGenerator.Instance);
 
-        public IAuditPropertySetter AuditPropertySetter { get; set; }
+        public IAuditPropertySetter AuditPropertySetter => LazyServiceProvider.LazyGetRequiredService<IAuditPropertySetter>();
 
-        public IMongoDbBulkOperationProvider BulkOperationProvider { get; set; }
+        public IMongoDbBulkOperationProvider BulkOperationProvider => LazyServiceProvider.LazyGetService<IMongoDbBulkOperationProvider>();
 
         public MongoDbRepository(IMongoDbContextProvider<TMongoDbContext> dbContextProvider)
         {
             DbContextProvider = dbContextProvider;
-
-            LocalEventBus = NullLocalEventBus.Instance;
-            DistributedEventBus = NullDistributedEventBus.Instance;
-            EntityChangeEventHelper = NullEntityChangeEventHelper.Instance;
-            GuidGenerator = SimpleGuidGenerator.Instance;
         }
 
-        public async override Task<TEntity> InsertAsync(
+        public override async Task<TEntity> InsertAsync(
             TEntity entity,
             bool autoSave = false,
             CancellationToken cancellationToken = default)
@@ -113,7 +108,7 @@ namespace Volo.Abp.Domain.Repositories.MongoDB
             }
         }
 
-        public async override Task<TEntity> UpdateAsync(
+        public override async Task<TEntity> UpdateAsync(
             TEntity entity,
             bool autoSave = false,
             CancellationToken cancellationToken = default)
@@ -216,7 +211,7 @@ namespace Volo.Abp.Domain.Repositories.MongoDB
             }
         }
 
-        public async override Task DeleteAsync(
+        public override async Task DeleteAsync(
             TEntity entity,
             bool autoSave = false,
             CancellationToken cancellationToken = default)
@@ -346,17 +341,17 @@ namespace Volo.Abp.Domain.Repositories.MongoDB
             }
         }
 
-        public async override Task<List<TEntity>> GetListAsync(bool includeDetails = false, CancellationToken cancellationToken = default)
+        public override async Task<List<TEntity>> GetListAsync(bool includeDetails = false, CancellationToken cancellationToken = default)
         {
             return await GetMongoQueryable().ToListAsync(GetCancellationToken(cancellationToken));
         }
 
-        public async override Task<long> GetCountAsync(CancellationToken cancellationToken = default)
+        public override async Task<long> GetCountAsync(CancellationToken cancellationToken = default)
         {
             return await GetMongoQueryable().LongCountAsync(GetCancellationToken(cancellationToken));
         }
 
-        public async override Task<List<TEntity>> GetPagedListAsync(
+        public override async Task<List<TEntity>> GetPagedListAsync(
             int skipCount,
             int maxResultCount,
             string sorting,
@@ -370,7 +365,7 @@ namespace Volo.Abp.Domain.Repositories.MongoDB
                 .ToListAsync(GetCancellationToken(cancellationToken));
         }
 
-        public async override Task DeleteAsync(
+        public override async Task DeleteAsync(
             Expression<Func<TEntity, bool>> predicate,
             bool autoSave = false,
             CancellationToken cancellationToken = default)
@@ -390,7 +385,7 @@ namespace Volo.Abp.Domain.Repositories.MongoDB
             return GetMongoQueryable();
         }
 
-        public async override Task<TEntity> FindAsync(
+        public override async Task<TEntity> FindAsync(
             Expression<Func<TEntity, bool>> predicate,
             bool includeDetails = true,
             CancellationToken cancellationToken = default)