diff --git a/framework/src/Volo.Abp.Uow/Volo.Abp.Uow.csproj b/framework/src/Volo.Abp.Uow/Volo.Abp.Uow.csproj
index f33af433e7..f1c8b13cad 100644
--- a/framework/src/Volo.Abp.Uow/Volo.Abp.Uow.csproj
+++ b/framework/src/Volo.Abp.Uow/Volo.Abp.Uow.csproj
@@ -5,6 +5,8 @@
 
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;netstandard2.1;net7.0</TargetFrameworks>
+    <Nullable>enable</Nullable>
+    <WarningsAsErrors>Nullable</WarningsAsErrors>
     <AssemblyName>Volo.Abp.Uow</AssemblyName>
     <PackageId>Volo.Abp.Uow</PackageId>
     <AssetTargetFallback>$(AssetTargetFallback);portable-net45+win8+wp8+wpa81;</AssetTargetFallback>
diff --git a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/AlwaysDisableTransactionsUnitOfWorkManager.cs b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/AlwaysDisableTransactionsUnitOfWorkManager.cs
index a02f63c3e1..462c001e6d 100644
--- a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/AlwaysDisableTransactionsUnitOfWorkManager.cs
+++ b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/AlwaysDisableTransactionsUnitOfWorkManager.cs
@@ -12,7 +12,7 @@ public class AlwaysDisableTransactionsUnitOfWorkManager : IUnitOfWorkManager
         _unitOfWorkManager = unitOfWorkManager;
     }
 
-    public IUnitOfWork Current => _unitOfWorkManager.Current;
+    public IUnitOfWork? Current => _unitOfWorkManager.Current;
 
     public IUnitOfWork Begin(AbpUnitOfWorkOptions options, bool requiresNew = false)
     {
diff --git a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/AmbientUnitOfWork.cs b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/AmbientUnitOfWork.cs
index 183126cb50..dc70dfad46 100644
--- a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/AmbientUnitOfWork.cs
+++ b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/AmbientUnitOfWork.cs
@@ -6,21 +6,21 @@ namespace Volo.Abp.Uow;
 [ExposeServices(typeof(IAmbientUnitOfWork), typeof(IUnitOfWorkAccessor))]
 public class AmbientUnitOfWork : IAmbientUnitOfWork, ISingletonDependency
 {
-    public IUnitOfWork UnitOfWork => _currentUow.Value;
+    public IUnitOfWork? UnitOfWork => _currentUow.Value;
 
-    private readonly AsyncLocal<IUnitOfWork> _currentUow;
+    private readonly AsyncLocal<IUnitOfWork?> _currentUow;
 
     public AmbientUnitOfWork()
     {
-        _currentUow = new AsyncLocal<IUnitOfWork>();
+        _currentUow = new AsyncLocal<IUnitOfWork?>();
     }
 
-    public void SetUnitOfWork(IUnitOfWork unitOfWork)
+    public void SetUnitOfWork(IUnitOfWork? unitOfWork)
     {
         _currentUow.Value = unitOfWork;
     }
 
-    public IUnitOfWork GetCurrentByChecking()
+    public IUnitOfWork? GetCurrentByChecking()
     {
         var uow = UnitOfWork;
 
diff --git a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/ChildUnitOfWork.cs b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/ChildUnitOfWork.cs
index bf8a44f724..eb51d8c189 100644
--- a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/ChildUnitOfWork.cs
+++ b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/ChildUnitOfWork.cs
@@ -10,9 +10,9 @@ internal class ChildUnitOfWork : IUnitOfWork
 {
     public Guid Id => _parent.Id;
 
-    public IAbpUnitOfWorkOptions Options => _parent.Options;
+    public IAbpUnitOfWorkOptions? Options => _parent.Options;
 
-    public IUnitOfWork Outer => _parent.Outer;
+    public IUnitOfWork? Outer => _parent.Outer;
 
     public bool IsReserved => _parent.IsReserved;
 
@@ -20,10 +20,10 @@ internal class ChildUnitOfWork : IUnitOfWork
 
     public bool IsCompleted => _parent.IsCompleted;
 
-    public string ReservationName => _parent.ReservationName;
+    public string? ReservationName => _parent.ReservationName;
 
-    public event EventHandler<UnitOfWorkFailedEventArgs> Failed;
-    public event EventHandler<UnitOfWorkEventArgs> Disposed;
+    public event EventHandler<UnitOfWorkFailedEventArgs> Failed = default!;
+    public event EventHandler<UnitOfWorkEventArgs> Disposed = default!;
 
     public IServiceProvider ServiceProvider => _parent.ServiceProvider;
 
@@ -37,11 +37,11 @@ internal class ChildUnitOfWork : IUnitOfWork
 
         _parent = parent;
 
-        _parent.Failed += (sender, args) => { Failed.InvokeSafely(sender, args); };
-        _parent.Disposed += (sender, args) => { Disposed.InvokeSafely(sender, args); };
+        _parent.Failed += (sender, args) => { Failed.InvokeSafely(sender!, args); };
+        _parent.Disposed += (sender, args) => { Disposed.InvokeSafely(sender!, args); };
     }
 
-    public void SetOuter(IUnitOfWork outer)
+    public void SetOuter(IUnitOfWork? outer)
     {
         _parent.SetOuter(outer);
     }
@@ -78,19 +78,19 @@ internal class ChildUnitOfWork : IUnitOfWork
 
     public void AddOrReplaceLocalEvent(
         UnitOfWorkEventRecord eventRecord,
-        Predicate<UnitOfWorkEventRecord> replacementSelector = null)
+        Predicate<UnitOfWorkEventRecord>? replacementSelector = null)
     {
         _parent.AddOrReplaceLocalEvent(eventRecord, replacementSelector);
     }
 
     public void AddOrReplaceDistributedEvent(
         UnitOfWorkEventRecord eventRecord,
-        Predicate<UnitOfWorkEventRecord> replacementSelector = null)
+        Predicate<UnitOfWorkEventRecord>? replacementSelector = null)
     {
         _parent.AddOrReplaceDistributedEvent(eventRecord, replacementSelector);
     }
 
-    public IDatabaseApi FindDatabaseApi(string key)
+    public IDatabaseApi? FindDatabaseApi(string key)
     {
         return _parent.FindDatabaseApi(key);
     }
@@ -105,7 +105,7 @@ internal class ChildUnitOfWork : IUnitOfWork
         return _parent.GetOrAddDatabaseApi(key, factory);
     }
 
-    public ITransactionApi FindTransactionApi(string key)
+    public ITransactionApi? FindTransactionApi(string key)
     {
         return _parent.FindTransactionApi(key);
     }
diff --git a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/IAmbientUnitOfWork.cs b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/IAmbientUnitOfWork.cs
index e29ed5aa6a..5781da4140 100644
--- a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/IAmbientUnitOfWork.cs
+++ b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/IAmbientUnitOfWork.cs
@@ -2,5 +2,5 @@
 
 public interface IAmbientUnitOfWork : IUnitOfWorkAccessor
 {
-    IUnitOfWork GetCurrentByChecking();
+    IUnitOfWork? GetCurrentByChecking();
 }
diff --git a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/IDatabaseApiContainer.cs b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/IDatabaseApiContainer.cs
index 429bd48998..23d3b0f20b 100644
--- a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/IDatabaseApiContainer.cs
+++ b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/IDatabaseApiContainer.cs
@@ -6,8 +6,7 @@ namespace Volo.Abp.Uow;
 
 public interface IDatabaseApiContainer : IServiceProviderAccessor
 {
-    [CanBeNull]
-    IDatabaseApi FindDatabaseApi([NotNull] string key);
+    IDatabaseApi? FindDatabaseApi([NotNull] string key);
 
     void AddDatabaseApi([NotNull] string key, [NotNull] IDatabaseApi api);
 
diff --git a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/ITransactionApiContainer.cs b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/ITransactionApiContainer.cs
index f5bdf13ccb..9acce6ce69 100644
--- a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/ITransactionApiContainer.cs
+++ b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/ITransactionApiContainer.cs
@@ -5,8 +5,7 @@ namespace Volo.Abp.Uow;
 
 public interface ITransactionApiContainer
 {
-    [CanBeNull]
-    ITransactionApi FindTransactionApi([NotNull] string key);
+    ITransactionApi? FindTransactionApi([NotNull] string key);
 
     void AddTransactionApi([NotNull] string key, [NotNull] ITransactionApi api);
 
diff --git a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/IUnitOfWork.cs b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/IUnitOfWork.cs
index 200ce937d9..15dc2bdec0 100644
--- a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/IUnitOfWork.cs
+++ b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/IUnitOfWork.cs
@@ -17,9 +17,9 @@ public interface IUnitOfWork : IDatabaseApiContainer, ITransactionApiContainer,
 
     event EventHandler<UnitOfWorkEventArgs> Disposed;
 
-    IAbpUnitOfWorkOptions Options { get; }
+    IAbpUnitOfWorkOptions? Options { get; }
 
-    IUnitOfWork Outer { get; }
+    IUnitOfWork? Outer { get; }
 
     bool IsReserved { get; }
 
@@ -27,9 +27,9 @@ public interface IUnitOfWork : IDatabaseApiContainer, ITransactionApiContainer,
 
     bool IsCompleted { get; }
 
-    string ReservationName { get; }
+    string? ReservationName { get; }
 
-    void SetOuter([CanBeNull] IUnitOfWork outer);
+    void SetOuter(IUnitOfWork? outer);
 
     void Initialize([NotNull] AbpUnitOfWorkOptions options);
 
@@ -45,11 +45,11 @@ public interface IUnitOfWork : IDatabaseApiContainer, ITransactionApiContainer,
 
     void AddOrReplaceLocalEvent(
         UnitOfWorkEventRecord eventRecord,
-        Predicate<UnitOfWorkEventRecord> replacementSelector = null
+        Predicate<UnitOfWorkEventRecord>? replacementSelector = null
     );
 
     void AddOrReplaceDistributedEvent(
         UnitOfWorkEventRecord eventRecord,
-        Predicate<UnitOfWorkEventRecord> replacementSelector = null
+        Predicate<UnitOfWorkEventRecord>? replacementSelector = null
     );
 }
diff --git a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/IUnitOfWorkAccessor.cs b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/IUnitOfWorkAccessor.cs
index 59fd00ce96..e2333b5bbc 100644
--- a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/IUnitOfWorkAccessor.cs
+++ b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/IUnitOfWorkAccessor.cs
@@ -4,8 +4,7 @@ namespace Volo.Abp.Uow;
 
 public interface IUnitOfWorkAccessor
 {
-    [CanBeNull]
-    IUnitOfWork UnitOfWork { get; }
+    IUnitOfWork? UnitOfWork { get; }
 
-    void SetUnitOfWork([CanBeNull] IUnitOfWork unitOfWork);
+    void SetUnitOfWork(IUnitOfWork? unitOfWork);
 }
diff --git a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/IUnitOfWorkManager.cs b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/IUnitOfWorkManager.cs
index 34796fe15b..4263dc5778 100644
--- a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/IUnitOfWorkManager.cs
+++ b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/IUnitOfWorkManager.cs
@@ -4,8 +4,7 @@ namespace Volo.Abp.Uow;
 
 public interface IUnitOfWorkManager
 {
-    [CanBeNull]
-    IUnitOfWork Current { get; }
+    IUnitOfWork? Current { get; }
 
     [NotNull]
     IUnitOfWork Begin([NotNull] AbpUnitOfWorkOptions options, bool requiresNew = false);
diff --git a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/UnitOfWork.cs b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/UnitOfWork.cs
index 626c74478b..b9b39f2f28 100644
--- a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/UnitOfWork.cs
+++ b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/UnitOfWork.cs
@@ -21,9 +21,9 @@ public class UnitOfWork : IUnitOfWork, ITransientDependency
 
     public Guid Id { get; } = Guid.NewGuid();
 
-    public IAbpUnitOfWorkOptions Options { get; private set; }
+    public IAbpUnitOfWorkOptions? Options { get; private set; }
 
-    public IUnitOfWork Outer { get; private set; }
+    public IUnitOfWork? Outer { get; private set; }
 
     public bool IsReserved { get; set; }
 
@@ -31,14 +31,14 @@ public class UnitOfWork : IUnitOfWork, ITransientDependency
 
     public bool IsCompleted { get; private set; }
 
-    public string ReservationName { get; set; }
+    public string? ReservationName { get; set; }
 
     protected List<Func<Task>> CompletedHandlers { get; } = new List<Func<Task>>();
     protected List<UnitOfWorkEventRecord> DistributedEvents { get; } = new List<UnitOfWorkEventRecord>();
     protected List<UnitOfWorkEventRecord> LocalEvents { get; } = new List<UnitOfWorkEventRecord>();
 
-    public event EventHandler<UnitOfWorkFailedEventArgs> Failed;
-    public event EventHandler<UnitOfWorkEventArgs> Disposed;
+    public event EventHandler<UnitOfWorkFailedEventArgs> Failed = default!;
+    public event EventHandler<UnitOfWorkEventArgs> Disposed = default!;
 
     public IServiceProvider ServiceProvider { get; }
     protected IUnitOfWorkEventPublisher UnitOfWorkEventPublisher { get; }
@@ -50,7 +50,7 @@ public class UnitOfWork : IUnitOfWork, ITransientDependency
     private readonly Dictionary<string, ITransactionApi> _transactionApis;
     private readonly AbpUnitOfWorkDefaultOptions _defaultOptions;
 
-    private Exception _exception;
+    private Exception? _exception;
     private bool _isCompleting;
     private bool _isRolledback;
 
@@ -90,7 +90,7 @@ public class UnitOfWork : IUnitOfWork, ITransientDependency
         IsReserved = true;
     }
 
-    public virtual void SetOuter(IUnitOfWork outer)
+    public virtual void SetOuter(IUnitOfWork? outer)
     {
         Outer = outer;
     }
@@ -104,9 +104,9 @@ public class UnitOfWork : IUnitOfWork, ITransientDependency
 
         foreach (var databaseApi in GetAllActiveDatabaseApis())
         {
-            if (databaseApi is ISupportsSavingChanges)
+            if (databaseApi is ISupportsSavingChanges supportsSavingChangesDatabaseApi)
             {
-                await (databaseApi as ISupportsSavingChanges).SaveChangesAsync(cancellationToken);
+                await supportsSavingChangesDatabaseApi.SaveChangesAsync(cancellationToken);
             }
         }
     }
@@ -181,7 +181,7 @@ public class UnitOfWork : IUnitOfWork, ITransientDependency
         await RollbackAllAsync(cancellationToken);
     }
 
-    public virtual IDatabaseApi FindDatabaseApi(string key)
+    public virtual IDatabaseApi? FindDatabaseApi(string key)
     {
         return _databaseApis.GetOrDefault(key);
     }
@@ -207,7 +207,7 @@ public class UnitOfWork : IUnitOfWork, ITransientDependency
         return _databaseApis.GetOrAdd(key, factory);
     }
 
-    public virtual ITransactionApi FindTransactionApi(string key)
+    public virtual ITransactionApi? FindTransactionApi(string key)
     {
         Check.NotNull(key, nameof(key));
 
@@ -242,14 +242,14 @@ public class UnitOfWork : IUnitOfWork, ITransientDependency
 
     public virtual void AddOrReplaceLocalEvent(
         UnitOfWorkEventRecord eventRecord,
-        Predicate<UnitOfWorkEventRecord> replacementSelector = null)
+        Predicate<UnitOfWorkEventRecord>? replacementSelector = null)
     {
         AddOrReplaceEvent(LocalEvents, eventRecord, replacementSelector);
     }
 
     public virtual void AddOrReplaceDistributedEvent(
         UnitOfWorkEventRecord eventRecord,
-        Predicate<UnitOfWorkEventRecord> replacementSelector = null)
+        Predicate<UnitOfWorkEventRecord>? replacementSelector = null)
     {
         AddOrReplaceEvent(DistributedEvents, eventRecord, replacementSelector);
     }
@@ -257,7 +257,7 @@ public class UnitOfWork : IUnitOfWork, ITransientDependency
     public virtual void AddOrReplaceEvent(
         List<UnitOfWorkEventRecord> eventRecords,
         UnitOfWorkEventRecord eventRecord,
-        Predicate<UnitOfWorkEventRecord> replacementSelector = null)
+        Predicate<UnitOfWorkEventRecord>? replacementSelector = null)
     {
         if (replacementSelector == null)
         {
@@ -340,11 +340,11 @@ public class UnitOfWork : IUnitOfWork, ITransientDependency
     {
         foreach (var databaseApi in GetAllActiveDatabaseApis())
         {
-            if (databaseApi is ISupportsRollback)
+            if (databaseApi is ISupportsRollback supportsRollbackDatabaseApi)
             {
                 try
                 {
-                    await (databaseApi as ISupportsRollback).RollbackAsync(cancellationToken);
+                    await supportsRollbackDatabaseApi.RollbackAsync(cancellationToken);
                 }
                 catch { }
             }
@@ -352,11 +352,11 @@ public class UnitOfWork : IUnitOfWork, ITransientDependency
 
         foreach (var transactionApi in GetAllActiveTransactionApis())
         {
-            if (transactionApi is ISupportsRollback)
+            if (transactionApi is ISupportsRollback supportsRollbackTransactionApi)
             {
                 try
                 {
-                    await (transactionApi as ISupportsRollback).RollbackAsync(cancellationToken);
+                    await supportsRollbackTransactionApi.RollbackAsync(cancellationToken);
                 }
                 catch { }
             }
diff --git a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/UnitOfWorkFailedEventArgs.cs b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/UnitOfWorkFailedEventArgs.cs
index e8c1d293d7..5867beab13 100644
--- a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/UnitOfWorkFailedEventArgs.cs
+++ b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/UnitOfWorkFailedEventArgs.cs
@@ -13,8 +13,7 @@ public class UnitOfWorkFailedEventArgs : UnitOfWorkEventArgs
     /// Can be null if there is no exception, but <see cref="IUnitOfWork.CompleteAsync"/> is not called.
     /// Can be null if another exception occurred during the UOW.
     /// </summary>
-    [CanBeNull]
-    public Exception Exception { get; }
+    public Exception? Exception { get; }
 
     /// <summary>
     /// True, if the unit of work is manually rolled back.
@@ -24,7 +23,7 @@ public class UnitOfWorkFailedEventArgs : UnitOfWorkEventArgs
     /// <summary>
     /// Creates a new <see cref="UnitOfWorkFailedEventArgs"/> object.
     /// </summary>
-    public UnitOfWorkFailedEventArgs([NotNull] IUnitOfWork unitOfWork, [CanBeNull] Exception exception, bool isRolledback)
+    public UnitOfWorkFailedEventArgs([NotNull] IUnitOfWork unitOfWork, Exception? exception, bool isRolledback)
         : base(unitOfWork)
     {
         Exception = exception;
diff --git a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/UnitOfWorkHelper.cs b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/UnitOfWorkHelper.cs
index 94929a6d1c..3e836a9ed0 100644
--- a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/UnitOfWorkHelper.cs
+++ b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/UnitOfWorkHelper.cs
@@ -23,7 +23,7 @@ public static class UnitOfWorkHelper
         return false;
     }
 
-    public static bool IsUnitOfWorkMethod([NotNull] MethodInfo methodInfo, [CanBeNull] out UnitOfWorkAttribute unitOfWorkAttribute)
+    public static bool IsUnitOfWorkMethod([NotNull] MethodInfo methodInfo, out UnitOfWorkAttribute? unitOfWorkAttribute)
     {
         Check.NotNull(methodInfo, nameof(methodInfo));
 
@@ -57,7 +57,7 @@ public static class UnitOfWorkHelper
         return false;
     }
 
-    public static UnitOfWorkAttribute GetUnitOfWorkAttributeOrNull(MethodInfo methodInfo)
+    public static UnitOfWorkAttribute? GetUnitOfWorkAttributeOrNull(MethodInfo methodInfo)
     {
         var attrs = methodInfo.GetCustomAttributes(true).OfType<UnitOfWorkAttribute>().ToArray();
         if (attrs.Length > 0)
@@ -65,12 +65,15 @@ public static class UnitOfWorkHelper
             return attrs[0];
         }
 
-        attrs = methodInfo.DeclaringType.GetTypeInfo().GetCustomAttributes(true).OfType<UnitOfWorkAttribute>().ToArray();
-        if (attrs.Length > 0)
+        if (methodInfo.DeclaringType != null)
         {
-            return attrs[0];
+            attrs = methodInfo.DeclaringType.GetTypeInfo().GetCustomAttributes(true).OfType<UnitOfWorkAttribute>().ToArray();
+            if (attrs.Length > 0)
+            {
+                return attrs[0];
+            }
         }
-
+        
         return null;
     }
 
diff --git a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/UnitOfWorkInterceptor.cs b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/UnitOfWorkInterceptor.cs
index 130f1d3e7b..d49d131299 100644
--- a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/UnitOfWorkInterceptor.cs
+++ b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/UnitOfWorkInterceptor.cs
@@ -52,7 +52,7 @@ public class UnitOfWorkInterceptor : AbpInterceptor, ITransientDependency
         }
     }
 
-    private AbpUnitOfWorkOptions CreateOptions(IServiceProvider serviceProvider, IAbpMethodInvocation invocation, [CanBeNull] UnitOfWorkAttribute unitOfWorkAttribute)
+    private AbpUnitOfWorkOptions CreateOptions(IServiceProvider serviceProvider, IAbpMethodInvocation invocation, UnitOfWorkAttribute? unitOfWorkAttribute)
     {
         var options = new AbpUnitOfWorkOptions();
 
diff --git a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/UnitOfWorkManager.cs b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/UnitOfWorkManager.cs
index 4752f5bdba..970f7030ca 100644
--- a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/UnitOfWorkManager.cs
+++ b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/UnitOfWorkManager.cs
@@ -10,7 +10,7 @@ public class UnitOfWorkManager : IUnitOfWorkManager, ISingletonDependency
     [Obsolete("This will be removed in next versions.")]
     public static AsyncLocal<bool> DisableObsoleteDbContextCreationWarning { get; } = new AsyncLocal<bool>();
 
-    public IUnitOfWork Current => _ambientUnitOfWork.GetCurrentByChecking();
+    public IUnitOfWork? Current => _ambientUnitOfWork.GetCurrentByChecking();
 
     private readonly IServiceScopeFactory _serviceScopeFactory;
     private readonly IAmbientUnitOfWork _ambientUnitOfWork;