Enable nullable annotations for Volo.Abp.EntityFrameworkCore

framework/src/Volo.Abp.Ddd.Domain/Volo/Abp/Domain/Repositories/ISupportsExplicitLoading.cs

@@ -18,7 +18,7 @@ public interface ISupportsExplicitLoading<TEntity>
 
     Task EnsurePropertyLoadedAsync<TProperty>(
         TEntity entity,
-        Expression<Func<TEntity, TProperty>> propertyExpression,
+        Expression<Func<TEntity, TProperty?>> propertyExpression,
         CancellationToken cancellationToken)
         where TProperty : class;
 }

framework/src/Volo.Abp.Ddd.Domain/Volo/Abp/Domain/Repositories/RepositoryExtensions.cs

@@ -34,7 +34,7 @@ public static class RepositoryExtensions
     public async static Task EnsurePropertyLoadedAsync<TEntity, TKey, TProperty>(
         this IBasicRepository<TEntity, TKey> repository,
         TEntity entity,
-        Expression<Func<TEntity, TProperty>> propertyExpression,
+        Expression<Func<TEntity, TProperty?>> propertyExpression,
         CancellationToken cancellationToken = default
     )
         where TEntity : class, IEntity<TKey>

framework/src/Volo.Abp.EntityFrameworkCore/Microsoft/Extensions/DependencyInjection/AbpEfCoreServiceCollectionExtensions.cs

@@ -13,7 +13,7 @@ public static class AbpEfCoreServiceCollectionExtensions
 {
     public static IServiceCollection AddAbpDbContext<TDbContext>(
         this IServiceCollection services,
-        Action<IAbpDbContextRegistrationOptionsBuilder> optionsBuilder = null)
+        Action<IAbpDbContextRegistrationOptionsBuilder>? optionsBuilder = null)
         where TDbContext : AbpDbContext<TDbContext>
     {
         services.AddMemoryCache();

framework/src/Volo.Abp.EntityFrameworkCore/Volo.Abp.EntityFrameworkCore.csproj

@@ -5,6 +5,8 @@
 
   <PropertyGroup>
     <TargetFramework>net7.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <WarningsAsErrors>Nullable</WarningsAsErrors>
     <AssemblyName>Volo.Abp.EntityFrameworkCore</AssemblyName>
     <PackageId>Volo.Abp.EntityFrameworkCore</PackageId>
     <AssetTargetFallback>$(AssetTargetFallback);portable-net45+win8+wp8+wpa81;</AssetTargetFallback>

framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/Domain/Repositories/EntityFrameworkCore/EfCoreRepository.cs

@@ -26,11 +26,11 @@ public class EfCoreRepository<TDbContext, TEntity> : RepositoryBase<TEntity>, IE
     protected virtual TDbContext DbContext => GetDbContext();
 
     [Obsolete("Use GetDbContextAsync() method.")]
-    DbContext IEfCoreRepository<TEntity>.DbContext => GetDbContext() as DbContext;
+    DbContext IEfCoreRepository<TEntity>.DbContext => (GetDbContext() as DbContext)!;
 
     async Task<DbContext> IEfCoreRepository<TEntity>.GetDbContextAsync()
     {
-        return await GetDbContextAsync() as DbContext;
+        return (await GetDbContextAsync() as DbContext)!;
     }
 
     [Obsolete("Use GetDbContextAsync() method.")]
@@ -80,7 +80,7 @@ public class EfCoreRepository<TDbContext, TEntity> : RepositoryBase<TEntity>, IE
         return (await GetDbContextAsync()).Database.GetDbConnection();
     }
 
-    protected async Task<IDbTransaction> GetDbTransactionAsync()
+    protected async Task<IDbTransaction?> GetDbTransactionAsync()
     {
         return (await GetDbContextAsync()).Database.CurrentTransaction?.GetDbTransaction();
     }
@@ -92,7 +92,7 @@ public class EfCoreRepository<TDbContext, TEntity> : RepositoryBase<TEntity>, IE
 
     public virtual IGuidGenerator GuidGenerator => LazyServiceProvider.LazyGetService<IGuidGenerator>(SimpleGuidGenerator.Instance);
 
-    public IEfCoreBulkOperationProvider BulkOperationProvider => LazyServiceProvider.LazyGetService<IEfCoreBulkOperationProvider>();
+    public IEfCoreBulkOperationProvider? BulkOperationProvider => LazyServiceProvider.LazyGetService<IEfCoreBulkOperationProvider>();
 
     public EfCoreRepository(IDbContextProvider<TDbContext> dbContextProvider)
     {
@@ -301,7 +301,7 @@ public class EfCoreRepository<TDbContext, TEntity> : RepositoryBase<TEntity>, IE
         await (await GetDbContextAsync()).SaveChangesAsync(cancellationToken);
     }
 
-    public async override Task<TEntity> FindAsync(
+    public async override Task<TEntity?> FindAsync(
         Expression<Func<TEntity, bool>> predicate,
         bool includeDetails = true,
         CancellationToken cancellationToken = default)
@@ -353,7 +353,7 @@ public class EfCoreRepository<TDbContext, TEntity> : RepositoryBase<TEntity>, IE
 
     public virtual async Task EnsurePropertyLoadedAsync<TProperty>(
         TEntity entity,
-        Expression<Func<TEntity, TProperty>> propertyExpression,
+        Expression<Func<TEntity, TProperty?>> propertyExpression,
         CancellationToken cancellationToken = default)
         where TProperty : class
     {
@@ -464,13 +464,13 @@ public class EfCoreRepository<TDbContext, TEntity, TKey> : EfCoreRepository<TDbC
         return entity;
     }
 
-    public virtual async Task<TEntity> FindAsync(TKey id, bool includeDetails = true, CancellationToken cancellationToken = default)
+    public virtual async Task<TEntity?> FindAsync(TKey id, bool includeDetails = true, CancellationToken cancellationToken = default)
     {
         return includeDetails
-            ? await (await WithDetailsAsync()).OrderBy(e => e.Id).FirstOrDefaultAsync(e => e.Id.Equals(id), GetCancellationToken(cancellationToken))
+            ? await (await WithDetailsAsync()).OrderBy(e => e.Id).FirstOrDefaultAsync(e => e.Id!.Equals(id), GetCancellationToken(cancellationToken))
             : !ShouldTrackingEntityChange()
-                ? await (await GetQueryableAsync()).OrderBy(e => e.Id).FirstOrDefaultAsync(e => e.Id.Equals(id), GetCancellationToken(cancellationToken))
-                : await (await GetDbSetAsync()).FindAsync(new object[] {id}, GetCancellationToken(cancellationToken));
+                ? await (await GetQueryableAsync()).OrderBy(e => e.Id).FirstOrDefaultAsync(e => e.Id!.Equals(id), GetCancellationToken(cancellationToken))
+                : await (await GetDbSetAsync()).FindAsync(new object[] {id!}, GetCancellationToken(cancellationToken));
     }
 
     public virtual async Task DeleteAsync(TKey id, bool autoSave = false, CancellationToken cancellationToken = default)

framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/EntityFrameworkCore/AbpDbContext.cs

@@ -37,7 +37,7 @@ namespace Volo.Abp.EntityFrameworkCore;
 public abstract class AbpDbContext<TDbContext> : DbContext, IAbpEfCoreDbContext, ITransientDependency
     where TDbContext : DbContext
 {
-    public IAbpLazyServiceProvider LazyServiceProvider { get; set; }
+    public IAbpLazyServiceProvider LazyServiceProvider { get; set; } = default!;
 
     protected virtual Guid? CurrentTenantId => CurrentTenant?.Id;
 
@@ -74,21 +74,21 @@ public abstract class AbpDbContext<TDbContext> : DbContext, IAbpEfCoreDbContext,
             .GetMethod(
                 nameof(ConfigureBaseProperties),
                 BindingFlags.Instance | BindingFlags.NonPublic
-            );
+            )!;
 
     private static readonly MethodInfo ConfigureValueConverterMethodInfo
         = typeof(AbpDbContext<TDbContext>)
             .GetMethod(
                 nameof(ConfigureValueConverter),
                 BindingFlags.Instance | BindingFlags.NonPublic
-            );
+            )!;
 
     private static readonly MethodInfo ConfigureValueGeneratedMethodInfo
         = typeof(AbpDbContext<TDbContext>)
             .GetMethod(
                 nameof(ConfigureValueGenerated),
                 BindingFlags.Instance | BindingFlags.NonPublic
-            );
+            )!;
 
     protected AbpDbContext(DbContextOptions<TDbContext> options)
         : base(options)
@@ -157,7 +157,7 @@ public abstract class AbpDbContext<TDbContext> : DbContext, IAbpEfCoreDbContext,
         try
         {
             var auditLog = AuditingManager?.Current?.Log;
-            List<EntityChangeInfo> entityChangeList = null;
+            List<EntityChangeInfo>? entityChangeList = null;
             if (auditLog != null)
             {
                 entityChangeList = EntityHistoryHelper.CreateChangeList(ChangeTracker.Entries().ToList());
@@ -174,7 +174,7 @@ public abstract class AbpDbContext<TDbContext> : DbContext, IAbpEfCoreDbContext,
             if (entityChangeList != null)
             {
                 EntityHistoryHelper.UpdateChangeList(entityChangeList);
-                auditLog.EntityChanges.AddRange(entityChangeList);
+                auditLog!.EntityChanges.AddRange(entityChangeList);
                 Logger.LogDebug($"Added {entityChangeList.Count} entity changes to the current audit log");
             }
 
@@ -249,13 +249,13 @@ public abstract class AbpDbContext<TDbContext> : DbContext, IAbpEfCoreDbContext,
         }
     }
 
-    protected virtual void ChangeTracker_Tracked(object sender, EntityTrackedEventArgs e)
+    protected virtual void ChangeTracker_Tracked(object? sender, EntityTrackedEventArgs e)
     {
         FillExtraPropertiesForTrackedEntities(e);
         PublishEventsForTrackedEntity(e.Entry);
     }
 
-    protected virtual void ChangeTracker_StateChanged(object sender, EntityStateChangedEventArgs e)
+    protected virtual void ChangeTracker_StateChanged(object? sender, EntityStateChangedEventArgs e)
     {
         PublishEventsForTrackedEntity(e.Entry);
     }
@@ -453,11 +453,11 @@ public abstract class AbpDbContext<TDbContext> : DbContext, IAbpEfCoreDbContext,
 
                     if (conversionType == typeof(Guid))
                     {
-                        entryProperty.CurrentValue = TypeDescriptor.GetConverter(conversionType).ConvertFromInvariantString(entityProperty.ToString());
+                        entryProperty.CurrentValue = TypeDescriptor.GetConverter(conversionType).ConvertFromInvariantString(entityProperty.ToString()!);
                     }
                     else if (conversionType.IsEnum)
                     {
-                        entryProperty.CurrentValue = Enum.Parse(conversionType, entityProperty.ToString(), ignoreCase: true);
+                        entryProperty.CurrentValue = Enum.Parse(conversionType, entityProperty.ToString()!, ignoreCase: true);
                     }
                     else
                     {
@@ -560,7 +560,7 @@ public abstract class AbpDbContext<TDbContext> : DbContext, IAbpEfCoreDbContext,
             return;
         }
 
-        var idProperty = entry.Property("Id").Metadata.PropertyInfo;
+        var idProperty = entry.Property("Id").Metadata.PropertyInfo!;
 
         //Check for DatabaseGeneratedAttribute
         var dbGeneratedAttr = ReflectionHelper
@@ -669,7 +669,7 @@ public abstract class AbpDbContext<TDbContext> : DbContext, IAbpEfCoreDbContext,
         }
 
         var idPropertyBuilder = modelBuilder.Entity<TEntity>().Property(x => ((IEntity<Guid>)x).Id);
-        if (idPropertyBuilder.Metadata.PropertyInfo.IsDefined(typeof(DatabaseGeneratedAttribute), true))
+        if (idPropertyBuilder.Metadata.PropertyInfo!.IsDefined(typeof(DatabaseGeneratedAttribute), true))
         {
             return;
         }
@@ -692,10 +692,10 @@ public abstract class AbpDbContext<TDbContext> : DbContext, IAbpEfCoreDbContext,
         return false;
     }
 
-    protected virtual Expression<Func<TEntity, bool>> CreateFilterExpression<TEntity>()
+    protected virtual Expression<Func<TEntity, bool>>? CreateFilterExpression<TEntity>()
         where TEntity : class
     {
-        Expression<Func<TEntity, bool>> expression = null;
+        Expression<Func<TEntity, bool>>? expression = null;
 
         if (typeof(ISoftDelete).IsAssignableFrom(typeof(TEntity)))
         {

framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/EntityFrameworkCore/AbpDbContextOptions.cs

@@ -12,7 +12,7 @@ public class AbpDbContextOptions
 {
     internal List<Action<AbpDbContextConfigurationContext>> DefaultPreConfigureActions { get; }
 
-    internal Action<AbpDbContextConfigurationContext> DefaultConfigureAction { get; set; }
+    internal Action<AbpDbContextConfigurationContext>? DefaultConfigureAction { get; set; }
 
     internal Dictionary<Type, List<object>> PreConfigureActions { get; }
 

framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/EntityFrameworkCore/DependencyInjection/AbpDbContextConfigurationContext.cs

@@ -14,17 +14,17 @@ public class AbpDbContextConfigurationContext : IServiceProviderAccessor
 
     public string ConnectionString { get; }
 
-    public string ConnectionStringName { get; }
+    public string? ConnectionStringName { get; }
 
-    public DbConnection ExistingConnection { get; }
+    public DbConnection? ExistingConnection { get; }
 
     public DbContextOptionsBuilder DbContextOptions { get; protected set; }
 
     public AbpDbContextConfigurationContext(
         [NotNull] string connectionString,
         [NotNull] IServiceProvider serviceProvider,
-        [CanBeNull] string connectionStringName,
-        [CanBeNull] DbConnection existingConnection)
+        string? connectionStringName,
+        DbConnection? existingConnection)
     {
         ConnectionString = connectionString;
         ServiceProvider = serviceProvider;
@@ -45,8 +45,8 @@ public class AbpDbContextConfigurationContext<TDbContext> : AbpDbContextConfigur
     public AbpDbContextConfigurationContext(
         string connectionString,
         [NotNull] IServiceProvider serviceProvider,
-        [CanBeNull] string connectionStringName,
-        [CanBeNull] DbConnection existingConnection)
+        string? connectionStringName,
+        DbConnection? existingConnection)
         : base(
               connectionString,
               serviceProvider,

framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/EntityFrameworkCore/DependencyInjection/AbpEntityOptions.cs

@@ -11,7 +11,7 @@ public class AbpEntityOptions<TEntity>
 {
     public static AbpEntityOptions<TEntity> Empty { get; } = new AbpEntityOptions<TEntity>();
 
-    public Func<IQueryable<TEntity>, IQueryable<TEntity>> DefaultWithDetailsFunc { get; set; }
+    public Func<IQueryable<TEntity>, IQueryable<TEntity>>? DefaultWithDetailsFunc { get; set; }
 }
 
 public class AbpEntityOptions
@@ -23,7 +23,7 @@ public class AbpEntityOptions
         _options = new Dictionary<Type, object>();
     }
 
-    public AbpEntityOptions<TEntity> GetOrNull<TEntity>()
+    public AbpEntityOptions<TEntity>? GetOrNull<TEntity>()
         where TEntity : IEntity
     {
         return _options.GetOrDefault(typeof(TEntity)) as AbpEntityOptions<TEntity>;
@@ -35,10 +35,10 @@ public class AbpEntityOptions
         Check.NotNull(optionsAction, nameof(optionsAction));
 
         optionsAction(
-            _options.GetOrAdd(
+            (_options.GetOrAdd(
                 typeof(TEntity),
                 () => new AbpEntityOptions<TEntity>()
-            ) as AbpEntityOptions<TEntity>
+            ) as AbpEntityOptions<TEntity>)!
         );
     }
 }

framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/EntityFrameworkCore/DependencyInjection/DbContextCreationContext.cs

@@ -6,14 +6,14 @@ namespace Volo.Abp.EntityFrameworkCore.DependencyInjection;
 
 public class DbContextCreationContext
 {
-    public static DbContextCreationContext Current => _current.Value;
+    public static DbContextCreationContext Current => _current.Value!;
     private static readonly AsyncLocal<DbContextCreationContext> _current = new AsyncLocal<DbContextCreationContext>();
 
     public string ConnectionStringName { get; }
 
     public string ConnectionString { get; }
 
-    public DbConnection ExistingConnection { get; internal set; }
+    public DbConnection? ExistingConnection { get; internal set; }
 
     public DbContextCreationContext(string connectionStringName, string connectionString)
     {

framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/EntityFrameworkCore/DependencyInjection/DbContextOptionsFactory.cs

@@ -43,7 +43,7 @@ public static class DbContextOptionsFactory
         var preConfigureActions = options.PreConfigureActions.GetOrDefault(typeof(TDbContext));
         if (!preConfigureActions.IsNullOrEmpty())
         {
-            foreach (var preConfigureAction in preConfigureActions)
+            foreach (var preConfigureAction in preConfigureActions!)
             {
                 ((Action<AbpDbContextConfigurationContext<TDbContext>>)preConfigureAction).Invoke(context);
             }

framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/EntityFrameworkCore/DistributedEvents/IncomingEventRecord.cs

@@ -15,11 +15,11 @@ public class IncomingEventRecord :
 
     public ExtraPropertyDictionary ExtraProperties { get; private set; }
 
-    public string MessageId { get; private set; }
+    public string MessageId { get; private set; } = default!;
 
-    public string EventName { get; private set; }
+    public string EventName { get; private set; } = default!;
 
-    public byte[] EventData { get; private set; }
+    public byte[] EventData { get; private set; } = default!;
 
     public DateTime CreationTime { get; private set; }
 

framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/EntityFrameworkCore/DistributedEvents/OutgoingEventRecord.cs

@@ -15,9 +15,9 @@ public class OutgoingEventRecord :
 
     public ExtraPropertyDictionary ExtraProperties { get; private set; }
 
-    public string EventName { get; private set; }
+    public string EventName { get; private set; } = default!;
 
-    public byte[] EventData { get; private set; }
+    public byte[] EventData { get; private set; } = default!;
 
     public DateTime CreationTime { get; private set; }
 

framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/EntityFrameworkCore/EfCoreAsyncQueryableProvider.cs

@@ -68,12 +68,12 @@ public class EfCoreAsyncQueryableProvider : IAsyncQueryableProvider, ISingletonD
         return queryable.FirstAsync(predicate, cancellationToken);
     }
 
-    public Task<T> FirstOrDefaultAsync<T>(IQueryable<T> queryable, CancellationToken cancellationToken = default)
+    public Task<T?> FirstOrDefaultAsync<T>(IQueryable<T> queryable, CancellationToken cancellationToken = default)
     {
         return queryable.FirstOrDefaultAsync(cancellationToken);
     }
 
-    public Task<T> FirstOrDefaultAsync<T>(IQueryable<T> queryable, Expression<Func<T, bool>> predicate,
+    public Task<T?> FirstOrDefaultAsync<T>(IQueryable<T> queryable, Expression<Func<T, bool>> predicate,
         CancellationToken cancellationToken = default)
     {
         return queryable.FirstOrDefaultAsync(predicate, cancellationToken);
@@ -89,12 +89,12 @@ public class EfCoreAsyncQueryableProvider : IAsyncQueryableProvider, ISingletonD
         return queryable.LastAsync(predicate, cancellationToken);
     }
 
-    public Task<T> LastOrDefaultAsync<T>(IQueryable<T> queryable, CancellationToken cancellationToken = default)
+    public Task<T?> LastOrDefaultAsync<T>(IQueryable<T> queryable, CancellationToken cancellationToken = default)
     {
         return queryable.LastOrDefaultAsync(cancellationToken);
     }
 
-    public Task<T> LastOrDefaultAsync<T>(IQueryable<T> queryable, Expression<Func<T, bool>> predicate,
+    public Task<T?> LastOrDefaultAsync<T>(IQueryable<T> queryable, Expression<Func<T, bool>> predicate,
         CancellationToken cancellationToken = default)
     {
         return queryable.LastOrDefaultAsync(predicate, cancellationToken);
@@ -110,12 +110,12 @@ public class EfCoreAsyncQueryableProvider : IAsyncQueryableProvider, ISingletonD
         return queryable.SingleAsync(predicate, cancellationToken);
     }
 
-    public Task<T> SingleOrDefaultAsync<T>(IQueryable<T> queryable, CancellationToken cancellationToken = default)
+    public Task<T?> SingleOrDefaultAsync<T>(IQueryable<T> queryable, CancellationToken cancellationToken = default)
     {
         return queryable.SingleOrDefaultAsync(cancellationToken);
     }
 
-    public Task<T> SingleOrDefaultAsync<T>(IQueryable<T> queryable, Expression<Func<T, bool>> predicate,
+    public Task<T?> SingleOrDefaultAsync<T>(IQueryable<T> queryable, Expression<Func<T, bool>> predicate,
         CancellationToken cancellationToken = default)
     {
         return queryable.SingleOrDefaultAsync(predicate, cancellationToken);

framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/EntityFrameworkCore/EntityHistory/EntityHistoryHelper.cs

@@ -69,8 +69,7 @@ public class EntityHistoryHelper : IEntityHistoryHelper, ITransientDependency
         return list;
     }
 
-    [CanBeNull]
-    protected virtual EntityChangeInfo CreateEntityChangeOrNull(EntityEntry entityEntry)
+    protected virtual EntityChangeInfo? CreateEntityChangeOrNull(EntityEntry entityEntry)
     {
         var entity = entityEntry.Entity;
 
@@ -138,7 +137,7 @@ public class EntityHistoryHelper : IEntityHistoryHelper, ITransientDependency
         }
     }
 
-    protected virtual string GetEntityId(object entityAsObj)
+    protected virtual string? GetEntityId(object entityAsObj)
     {
         if ((entityAsObj is IEntity entity))
         {
@@ -370,10 +369,10 @@ public class EntityHistoryHelper : IEntityHistoryHelper, ITransientDependency
                             // Add foreign key
                             entityChange.PropertyChanges.Add(new EntityPropertyChangeInfo
                             {
-                                NewValue = JsonSerializer.Serialize(propertyEntry.CurrentValue),
-                                OriginalValue = JsonSerializer.Serialize(propertyEntry.OriginalValue),
+                                NewValue = JsonSerializer.Serialize(propertyEntry.CurrentValue!),
+                                OriginalValue = JsonSerializer.Serialize(propertyEntry.OriginalValue!),
                                 PropertyName = property.Name,
-                                PropertyTypeFullName = property.ClrType.GetFirstGenericArgumentIfNullable().FullName
+                                PropertyTypeFullName = property.ClrType.GetFirstGenericArgumentIfNullable().FullName!
                             });
                         }
 
@@ -382,7 +381,7 @@ public class EntityHistoryHelper : IEntityHistoryHelper, ITransientDependency
 
                     if (propertyChange.OriginalValue == propertyChange.NewValue)
                     {
-                        var newValue = JsonSerializer.Serialize(propertyEntry.CurrentValue);
+                        var newValue = JsonSerializer.Serialize(propertyEntry.CurrentValue!);
                         if (newValue == propertyChange.NewValue)
                         {
                             // No change

framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/EntityFrameworkCore/IEfCoreDbContext.cs

@@ -60,17 +60,17 @@ public interface IEfCoreDbContext : IDisposable, IInfrastructure<IServiceProvide
 
     EntityEntry Entry([NotNull] object entity);
 
-    object Find([NotNull] Type entityType, [NotNull] params object[] keyValues);
+    object? Find([NotNull] Type entityType, [NotNull] params object[] keyValues);
 
-    TEntity Find<TEntity>([NotNull] params object[] keyValues) where TEntity : class;
+    TEntity? Find<TEntity>([NotNull] params object[] keyValues) where TEntity : class;
 
-    ValueTask<object> FindAsync([NotNull] Type entityType, [NotNull] object[] keyValues, CancellationToken cancellationToken);
+    ValueTask<object?> FindAsync([NotNull] Type entityType, [NotNull] object[] keyValues, CancellationToken cancellationToken);
 
-    ValueTask<TEntity> FindAsync<TEntity>([NotNull] object[] keyValues, CancellationToken cancellationToken) where TEntity : class;
+    ValueTask<TEntity?> FindAsync<TEntity>([NotNull] object[] keyValues, CancellationToken cancellationToken) where TEntity : class;
 
-    ValueTask<TEntity> FindAsync<TEntity>([NotNull] params object[] keyValues) where TEntity : class;
+    ValueTask<TEntity?> FindAsync<TEntity>([NotNull] params object[] keyValues) where TEntity : class;
 
-    ValueTask<object> FindAsync([NotNull] Type entityType, [NotNull] params object[] keyValues);
+    ValueTask<object?> FindAsync([NotNull] Type entityType, [NotNull] params object[] keyValues);
 
     EntityEntry<TEntity> Remove<TEntity>([NotNull] TEntity entity) where TEntity : class;
 

framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/EntityFrameworkCore/Migrations/EfCoreDatabaseMigrationEventHandlerBase.cs

@@ -210,7 +210,7 @@ public abstract class EfCoreDatabaseMigrationEventHandlerBase<TDbContext> :
                 else
                 {
                     var tenantConfiguration = await TenantStore.FindAsync(tenantId.Value);
-                    if (!tenantConfiguration.ConnectionStrings.Default.IsNullOrWhiteSpace() ||
+                    if (!tenantConfiguration!.ConnectionStrings!.Default.IsNullOrWhiteSpace() ||
                         !tenantConfiguration.ConnectionStrings.GetOrDefault(DatabaseName).IsNullOrWhiteSpace())
                     {
                         //Migrating the tenant database (only if tenant has a separate database)
@@ -301,7 +301,7 @@ public abstract class EfCoreDatabaseMigrationEventHandlerBase<TDbContext> :
             return 0;
         }
 
-        return int.Parse(tryCountAsString);
+        return int.Parse(tryCountAsString!);
     }
 
     private static void SetEventTryCount(EtoBase eventData, int count)

framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/EntityFrameworkCore/Modeling/AbpModelBuilderConfigurationOptions.cs

@@ -12,14 +12,14 @@ public class AbpModelBuilderConfigurationOptions
             _tablePrefix = value;
         }
     }
-    private string _tablePrefix;
 
-    [CanBeNull]
-    public string Schema { get; set; }
+    private string _tablePrefix = default!;
+
+    public string? Schema { get; set; }
 
     public AbpModelBuilderConfigurationOptions(
         [NotNull] string tablePrefix = "",
-        [CanBeNull] string schema = null)
+        string? schema = null)
     {
         Check.NotNull(tablePrefix, nameof(tablePrefix));
 

framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/EntityFrameworkCore/QueryFilterExpressionHelper.cs

@@ -29,7 +29,7 @@ public static class QueryFilterExpressionHelper
             _newValue = newValue;
         }
 
-        public override Expression Visit(Expression node)
+        public override Expression? Visit(Expression? node)
         {
             return node == _oldValue ? _newValue : base.Visit(node);
         }

framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/EntityFrameworkCore/ValueComparers/ExtraPropertyDictionaryValueComparer.cs

@@ -9,7 +9,7 @@ public class ExtraPropertyDictionaryValueComparer : ValueComparer<ExtraPropertyD
 {
     public ExtraPropertyDictionaryValueComparer()
         : base(
-              (d1, d2) => d1.SequenceEqual(d2),
+              (d1, d2) => d1!.SequenceEqual(d2!),
               d => d.Aggregate(0, (k, v) => HashCode.Combine(k, v.GetHashCode())),
               d => new ExtraPropertyDictionary(d))
     {

framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/EntityFrameworkCore/ValueConverters/AbpDateTimeValueConverter.cs

@@ -7,7 +7,7 @@ namespace Volo.Abp.EntityFrameworkCore.ValueConverters;
 
 public class AbpDateTimeValueConverter : ValueConverter<DateTime, DateTime>
 {
-    public AbpDateTimeValueConverter(IClock clock, [CanBeNull] ConverterMappingHints mappingHints = null)
+    public AbpDateTimeValueConverter(IClock clock, ConverterMappingHints? mappingHints = null)
         : base(
             x => clock.Normalize(x),
             x => clock.Normalize(x), mappingHints)
@@ -17,7 +17,7 @@ public class AbpDateTimeValueConverter : ValueConverter<DateTime, DateTime>
 
 public class AbpNullableDateTimeValueConverter : ValueConverter<DateTime?, DateTime?>
 {
-    public AbpNullableDateTimeValueConverter(IClock clock, [CanBeNull] ConverterMappingHints mappingHints = null)
+    public AbpNullableDateTimeValueConverter(IClock clock, ConverterMappingHints? mappingHints = null)
         : base(
             x => x.HasValue ? clock.Normalize(x.Value) : x,
             x => x.HasValue ? clock.Normalize(x.Value) : x, mappingHints)

framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/EntityFrameworkCore/ValueConverters/AbpJsonValueConverter.cs

@@ -29,6 +29,6 @@ public class AbpJsonValueConverter<TPropertyType> : ValueConverter<TPropertyType
 
     private static TPropertyType DeserializeObject(string s)
     {
-        return JsonSerializer.Deserialize<TPropertyType>(s, DeserializeOptions);
+        return JsonSerializer.Deserialize<TPropertyType>(s, DeserializeOptions)!;
     }
 }

framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/EntityFrameworkCore/ValueConverters/ExtraPropertiesValueConverter.cs

@@ -19,9 +19,9 @@ public class ExtraPropertiesValueConverter : ValueConverter<ExtraPropertyDiction
 
     }
 
-    private static string SerializeObject(ExtraPropertyDictionary extraProperties, Type entityType)
+    private static string SerializeObject(ExtraPropertyDictionary extraProperties, Type? entityType)
     {
-        var copyDictionary = new Dictionary<string, object>(extraProperties);
+        var copyDictionary = new Dictionary<string, object?>(extraProperties);
 
         if (entityType != null)
         {
@@ -49,7 +49,7 @@ public class ExtraPropertiesValueConverter : ValueConverter<ExtraPropertyDiction
         }
     };
 
-    private static ExtraPropertyDictionary DeserializeObject(string extraPropertiesAsJson, Type entityType)
+    private static ExtraPropertyDictionary DeserializeObject(string extraPropertiesAsJson, Type? entityType)
     {
         if (extraPropertiesAsJson.IsNullOrEmpty() || extraPropertiesAsJson == "{}")
         {
@@ -66,7 +66,7 @@ public class ExtraPropertiesValueConverter : ValueConverter<ExtraPropertyDiction
             {
                 foreach (var property in objectExtension.GetProperties())
                 {
-                    dictionary[property.Name] = GetNormalizedValue(dictionary, property);
+                    dictionary[property.Name] = GetNormalizedValue(dictionary!, property);
                 }
             }
         }
@@ -74,7 +74,7 @@ public class ExtraPropertiesValueConverter : ValueConverter<ExtraPropertyDiction
         return dictionary;
     }
 
-    private static object GetNormalizedValue(
+    private static object? GetNormalizedValue(
         Dictionary<string, object> dictionary,
         ObjectExtensionPropertyInfo property)
     {
@@ -88,7 +88,7 @@ public class ExtraPropertiesValueConverter : ValueConverter<ExtraPropertyDiction
         {
             if (property.Type.IsEnum)
             {
-                return Enum.Parse(property.Type, value.ToString(), true);
+                return Enum.Parse(property.Type, value.ToString()!, true);
             }
 
             //return Convert.ChangeType(value, property.Type);

framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/ObjectExtending/EfCoreObjectExtensionPropertyInfoExtensions.cs

@@ -43,7 +43,7 @@ public static class EfCoreObjectExtensionPropertyInfoExtensions
     [NotNull]
     public static ObjectExtensionPropertyInfo MapEfCore(
         [NotNull] this ObjectExtensionPropertyInfo propertyExtension,
-        [CanBeNull] Action<EntityTypeBuilder, PropertyBuilder> entityTypeAndPropertyBuildAction)
+        Action<EntityTypeBuilder, PropertyBuilder>? entityTypeAndPropertyBuildAction)
     {
         Check.NotNull(propertyExtension, nameof(propertyExtension));
 
@@ -56,8 +56,7 @@ public static class EfCoreObjectExtensionPropertyInfoExtensions
         return propertyExtension;
     }
 
-    [CanBeNull]
-    public static ObjectExtensionPropertyInfoEfCoreMappingOptions GetEfCoreMappingOrNull(
+    public static ObjectExtensionPropertyInfoEfCoreMappingOptions? GetEfCoreMappingOrNull(
         [NotNull] this ObjectExtensionPropertyInfo propertyExtension)
     {
         Check.NotNull(propertyExtension, nameof(propertyExtension));

framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/ObjectExtending/ObjectExtensionInfoEfCoreMappingOptions.cs

@@ -10,11 +10,9 @@ public class ObjectExtensionInfoEfCoreMappingOptions
     [NotNull]
     public ObjectExtensionInfo ObjectExtension { get; }
 
-    [CanBeNull]
-    public Action<EntityTypeBuilder> EntityTypeBuildAction { get; set; }
+    public Action<EntityTypeBuilder>? EntityTypeBuildAction { get; set; }
 
-    [CanBeNull]
-    public Action<ModelBuilder> ModelBuildAction { get; set; }
+    public Action<ModelBuilder>? ModelBuildAction { get; set; }
 
     public ObjectExtensionInfoEfCoreMappingOptions(
         [NotNull] ObjectExtensionInfo objectExtension,

framework/src/Volo.Abp.EntityFrameworkCore/Volo/Abp/ObjectExtending/ObjectExtensionPropertyInfoEfCoreMappingOptions.cs

@@ -13,17 +13,15 @@ public class ObjectExtensionPropertyInfoEfCoreMappingOptions
     public ObjectExtensionInfo ObjectExtension => ExtensionProperty.ObjectExtension;
 
     [Obsolete("Use EntityTypeAndPropertyBuildAction property.")]
-    [CanBeNull]
-    public Action<PropertyBuilder> PropertyBuildAction { get; set; }
+    public Action<PropertyBuilder>? PropertyBuildAction { get; set; }
 
-    [CanBeNull]
-    public Action<EntityTypeBuilder, PropertyBuilder> EntityTypeAndPropertyBuildAction { get; set; }
+    public Action<EntityTypeBuilder, PropertyBuilder>? EntityTypeAndPropertyBuildAction { get; set; }
 
     [Obsolete("Use other constructors.")]
     public ObjectExtensionPropertyInfoEfCoreMappingOptions(
         [NotNull] ObjectExtensionPropertyInfo extensionProperty,
-        [CanBeNull] Action<PropertyBuilder> propertyBuildAction = null,
-        [CanBeNull] Action<EntityTypeBuilder, PropertyBuilder> entityTypeAndPropertyBuildAction = null)
+        Action<PropertyBuilder>? propertyBuildAction = null,
+        Action<EntityTypeBuilder, PropertyBuilder>? entityTypeAndPropertyBuildAction = null)
     {
         ExtensionProperty = Check.NotNull(extensionProperty, nameof(extensionProperty));
 
@@ -39,7 +37,7 @@ public class ObjectExtensionPropertyInfoEfCoreMappingOptions
 
     public ObjectExtensionPropertyInfoEfCoreMappingOptions(
         [NotNull] ObjectExtensionPropertyInfo extensionProperty,
-        [CanBeNull] Action<EntityTypeBuilder, PropertyBuilder> entityTypeAndPropertyBuildAction)
+        Action<EntityTypeBuilder, PropertyBuilder>? entityTypeAndPropertyBuildAction)
     {
         ExtensionProperty = Check.NotNull(extensionProperty, nameof(extensionProperty));
 

framework/src/Volo.Abp.MongoDB/Volo/Abp/Uow/MongoDB/UnitOfWorkMongoDbContextProvider.cs

@@ -131,7 +131,7 @@ public class UnitOfWorkMongoDbContextProvider<TMongoDbContext> : IMongoDbContext
         var client = CreateMongoClient(mongoUrl);
         var database = client.GetDatabase(databaseName);
 
-        if (unitOfWork.Options!.IsTransactional)
+        if (unitOfWork.Options.IsTransactional)
         {
             return CreateDbContextWithTransaction(unitOfWork, mongoUrl, client, database);
         }
@@ -151,7 +151,7 @@ public class UnitOfWorkMongoDbContextProvider<TMongoDbContext> : IMongoDbContext
         var client = CreateMongoClient(mongoUrl);
         var database = client.GetDatabase(databaseName);
 
-        if (unitOfWork.Options!.IsTransactional)
+        if (unitOfWork.Options.IsTransactional)
         {
             return await CreateDbContextWithTransactionAsync(
                 unitOfWork,
@@ -183,7 +183,7 @@ public class UnitOfWorkMongoDbContextProvider<TMongoDbContext> : IMongoDbContext
         {
             var session = client.StartSession();
 
-            if (unitOfWork.Options!.Timeout.HasValue)
+            if (unitOfWork.Options.Timeout.HasValue)
             {
                 session.AdvanceOperationTime(new BsonTimestamp(unitOfWork.Options.Timeout.Value));
             }
@@ -233,7 +233,7 @@ public class UnitOfWorkMongoDbContextProvider<TMongoDbContext> : IMongoDbContext
         {
             var session = await client.StartSessionAsync(cancellationToken: GetCancellationToken(cancellationToken));
 
-            if (unitOfWork.Options!.Timeout.HasValue)
+            if (unitOfWork.Options.Timeout.HasValue)
             {
                 session.AdvanceOperationTime(new BsonTimestamp(unitOfWork.Options.Timeout.Value));
             }

framework/src/Volo.Abp.Uow/Volo/Abp/Uow/ChildUnitOfWork.cs

@@ -10,7 +10,7 @@ internal class ChildUnitOfWork : IUnitOfWork
 {
     public Guid Id => _parent.Id;
 
-    public IAbpUnitOfWorkOptions? Options => _parent.Options;
+    public IAbpUnitOfWorkOptions Options => _parent.Options;
 
     public IUnitOfWork? Outer => _parent.Outer;
 

framework/src/Volo.Abp.Uow/Volo/Abp/Uow/IUnitOfWork.cs

@@ -17,7 +17,7 @@ public interface IUnitOfWork : IDatabaseApiContainer, ITransactionApiContainer,
 
     event EventHandler<UnitOfWorkEventArgs> Disposed;
 
-    IAbpUnitOfWorkOptions? Options { get; }
+    IAbpUnitOfWorkOptions Options { get; }
 
     IUnitOfWork? Outer { get; }
 

framework/src/Volo.Abp.Uow/Volo/Abp/Uow/UnitOfWork.cs

@@ -21,7 +21,7 @@ public class UnitOfWork : IUnitOfWork, ITransientDependency
 
     public Guid Id { get; } = Guid.NewGuid();
 
-    public IAbpUnitOfWorkOptions? Options { get; private set; }
+    public IAbpUnitOfWorkOptions Options { get; private set; } = default!;
 
     public IUnitOfWork? Outer { get; private set; }