Enable nullable annotations for Volo.Abp.EventBus.*

framework/src/Volo.Abp.AzureServiceBus/Volo/Abp/AzureServiceBus/AzureServiceBusMessageConsumerFactory.cs

@@ -14,7 +14,7 @@ public class AzureServiceBusMessageConsumerFactory : IAzureServiceBusMessageCons
         ServiceScope = serviceScopeFactory.CreateScope();
     }
 
-    public IAzureServiceBusMessageConsumer CreateMessageConsumer(string topicName, string subscriptionName, string connectionName)
+    public IAzureServiceBusMessageConsumer CreateMessageConsumer(string topicName, string subscriptionName, string? connectionName)
     {
         var processor = ServiceScope.ServiceProvider.GetRequiredService<AzureServiceBusMessageConsumer>();
         processor.Initialize(topicName, subscriptionName, connectionName);

framework/src/Volo.Abp.AzureServiceBus/Volo/Abp/AzureServiceBus/ConnectionPool.cs

@@ -28,7 +28,7 @@ public class ConnectionPool : IConnectionPool, ISingletonDependency
         Logger = new NullLogger<ConnectionPool>();
     }
 
-    public ServiceBusClient GetClient(string connectionName)
+    public ServiceBusClient GetClient(string? connectionName)
     {
         connectionName ??= AzureServiceBusConnections.DefaultConnectionName;
         return _clients.GetOrAdd(
@@ -40,7 +40,7 @@ public class ConnectionPool : IConnectionPool, ISingletonDependency
         ).Value;
     }
 
-    public ServiceBusAdministrationClient GetAdministrationClient(string connectionName)
+    public ServiceBusAdministrationClient GetAdministrationClient(string? connectionName)
     {
         connectionName ??= AzureServiceBusConnections.DefaultConnectionName;
         return _adminClients.GetOrAdd(

framework/src/Volo.Abp.AzureServiceBus/Volo/Abp/AzureServiceBus/IAzureServiceBusMessageConsumerFactory.cs

@@ -16,5 +16,5 @@ public interface IAzureServiceBusMessageConsumerFactory
     IAzureServiceBusMessageConsumer CreateMessageConsumer(
         string topicName,
         string subscriptionName,
-        string connectionName);
+        string? connectionName);
 }

framework/src/Volo.Abp.AzureServiceBus/Volo/Abp/AzureServiceBus/IConnectionPool.cs

@@ -6,7 +6,7 @@ namespace Volo.Abp.AzureServiceBus;
 
 public interface IConnectionPool : IAsyncDisposable
 {
-    ServiceBusClient GetClient(string connectionName);
+    ServiceBusClient GetClient(string? connectionName);
 
-    ServiceBusAdministrationClient GetAdministrationClient(string connectionName);
+    ServiceBusAdministrationClient GetAdministrationClient(string? connectionName);
 }

framework/src/Volo.Abp.AzureServiceBus/Volo/Abp/AzureServiceBus/IPublisherPool.cs

@@ -6,5 +6,5 @@ namespace Volo.Abp.AzureServiceBus;
 
 public interface IPublisherPool : IAsyncDisposable
 {
-    Task<ServiceBusSender> GetAsync(string topicName, string connectionName);
+    Task<ServiceBusSender> GetAsync(string topicName, string? connectionName);
 }

framework/src/Volo.Abp.AzureServiceBus/Volo/Abp/AzureServiceBus/PublisherPool.cs

@@ -24,7 +24,7 @@ public class PublisherPool : IPublisherPool, ISingletonDependency
         Logger = new NullLogger<PublisherPool>();
     }
 
-    public async Task<ServiceBusSender> GetAsync(string topicName, string connectionName)
+    public async Task<ServiceBusSender> GetAsync(string topicName, string? connectionName)
     {
         var admin = _connectionPool.GetAdministrationClient(connectionName);
         await admin.SetupTopicAsync(topicName);

framework/src/Volo.Abp.EventBus.Abstractions/Volo.Abp.EventBus.Abstractions.csproj

@@ -5,6 +5,8 @@
     
     <PropertyGroup>
         <TargetFrameworks>netstandard2.0;netstandard2.1;net7.0</TargetFrameworks>
+        <Nullable>enable</Nullable>
+        <WarningsAsErrors>Nullable</WarningsAsErrors>
         <RootNamespace />
     </PropertyGroup>
 

framework/src/Volo.Abp.EventBus.Abstractions/Volo/Abp/EventBus/Distributed/DistributedEventReceived.cs

@@ -4,7 +4,7 @@ public class DistributedEventReceived
 {
     public DistributedEventSource Source { get; set; }
 
-    public string EventName { get; set; }
+    public string EventName { get; set; } = default!;
 
-    public object EventData { get; set; }
+    public object EventData { get; set; } = default!;
 }

framework/src/Volo.Abp.EventBus.Abstractions/Volo/Abp/EventBus/Distributed/DistributedEventSent.cs

@@ -4,7 +4,7 @@ public class DistributedEventSent
 {
     public DistributedEventSource Source { get; set; }
 
-    public string EventName { get; set; }
+    public string EventName { get; set; } = default!;
 
-    public object EventData { get; set; }
+    public object EventData { get; set; } = default!;
 }

framework/src/Volo.Abp.EventBus.Abstractions/Volo/Abp/EventBus/Distributed/InboxConfig.cs

@@ -13,13 +13,13 @@ public class InboxConfig
         get => _databaseName;
         set => _databaseName = Check.NotNullOrWhiteSpace(value, nameof(DatabaseName));
     }
-    [NotNull] private string _databaseName;
+    [NotNull] private string _databaseName = default!;
 
-    public Type ImplementationType { get; set; }
+    public Type ImplementationType { get; set; } = default!;
 
-    public Func<Type, bool> EventSelector { get; set; }
+    public Func<Type, bool>? EventSelector { get; set; }
 
-    public Func<Type, bool> HandlerSelector { get; set; }
+    public Func<Type, bool>? HandlerSelector { get; set; }
 
     /// <summary>
     /// Used to enable/disable processing incoming events.

framework/src/Volo.Abp.EventBus.Abstractions/Volo/Abp/EventBus/Distributed/IncomingEventInfo.cs

@@ -12,11 +12,11 @@ public class IncomingEventInfo : IHasExtraProperties
 
     public Guid Id { get; }
 
-    public string MessageId { get; }
+    public string MessageId { get; } = default!;
 
-    public string EventName { get; }
+    public string EventName { get; } = default!;
 
-    public byte[] EventData { get; }
+    public byte[] EventData { get; } = default!;
 
     public DateTime CreationTime { get; }
 
@@ -47,7 +47,7 @@ public class IncomingEventInfo : IHasExtraProperties
         ExtraProperties[EventBusConsts.CorrelationIdHeaderName] = correlationId;
     }
 
-    public string GetCorrelationId()
+    public string? GetCorrelationId()
     {
         return ExtraProperties.GetOrDefault(EventBusConsts.CorrelationIdHeaderName)?.ToString();
     }

framework/src/Volo.Abp.EventBus.Abstractions/Volo/Abp/EventBus/Distributed/OutboxConfig.cs

@@ -13,11 +13,11 @@ public class OutboxConfig
         get => _databaseName;
         set => _databaseName = Check.NotNullOrWhiteSpace(value, nameof(DatabaseName));
     }
-    [NotNull] private string _databaseName;
+    [NotNull] private string _databaseName = default!;
 
-    public Type ImplementationType { get; set; }
+    public Type ImplementationType { get; set; } = default!;
 
-    public Func<Type, bool> Selector { get; set; }
+    public Func<Type, bool>? Selector { get; set; }
 
     /// <summary>
     /// Used to enable/disable sending events from outbox to the message broker.

framework/src/Volo.Abp.EventBus.Abstractions/Volo/Abp/EventBus/Distributed/OutgoingEventInfo.cs

@@ -12,9 +12,9 @@ public class OutgoingEventInfo : IHasExtraProperties
 
     public Guid Id { get; }
 
-    public string EventName { get; }
+    public string EventName { get; } = default!;
 
-    public byte[] EventData { get; }
+    public byte[] EventData { get; } = default!;
 
     public DateTime CreationTime { get; }
 
@@ -43,7 +43,7 @@ public class OutgoingEventInfo : IHasExtraProperties
         ExtraProperties[EventBusConsts.CorrelationIdHeaderName] = correlationId;
     }
 
-    public string GetCorrelationId()
+    public string? GetCorrelationId()
     {
         return ExtraProperties.GetOrDefault(EventBusConsts.CorrelationIdHeaderName)?.ToString();
     }

framework/src/Volo.Abp.EventBus.Abstractions/Volo/Abp/EventBus/EventNameAttribute.cs

@@ -23,12 +23,12 @@ public class EventNameAttribute : Attribute, IEventNameProvider
     {
         Check.NotNull(eventType, nameof(eventType));
 
-        return eventType
-                   .GetCustomAttributes(true)
-                   .OfType<IEventNameProvider>()
-                   .FirstOrDefault()
-                   ?.GetName(eventType)
-               ?? eventType.FullName;
+        return (eventType
+                    .GetCustomAttributes(true)
+                    .OfType<IEventNameProvider>()
+                    .FirstOrDefault()
+                    ?.GetName(eventType)
+                ?? eventType.FullName)!;
     }
 
     public string GetName(Type eventType)

framework/src/Volo.Abp.EventBus.Abstractions/Volo/Abp/EventBus/GenericEventNameAttribute.cs

@@ -5,9 +5,9 @@ namespace Volo.Abp.EventBus;
 [AttributeUsage(AttributeTargets.Class)]
 public class GenericEventNameAttribute : Attribute, IEventNameProvider
 {
-    public string Prefix { get; set; }
+    public string? Prefix { get; set; }
 
-    public string Postfix { get; set; }
+    public string? Postfix { get; set; }
 
     public virtual string GetName(Type eventType)
     {

framework/src/Volo.Abp.EventBus.Azure/Volo.Abp.EventBus.Azure.csproj

@@ -5,6 +5,8 @@
 
     <PropertyGroup>
         <TargetFrameworks>netstandard2.0;netstandard2.1;net7.0</TargetFrameworks>
+        <Nullable>enable</Nullable>
+        <WarningsAsErrors>Nullable</WarningsAsErrors>
         <AssemblyName>Volo.Abp.EventBus.Azure</AssemblyName>
         <PackageId>Volo.Abp.EventBus.Azure</PackageId>
         <AssetTargetFallback>$(AssetTargetFallback);portable-net45+win8+wp8+wpa81;</AssetTargetFallback>

framework/src/Volo.Abp.EventBus.Azure/Volo/Abp/EventBus/Azure/AbpAzureEventBusOptions.cs

@@ -2,11 +2,11 @@ namespace Volo.Abp.EventBus.Azure;
 
 public class AbpAzureEventBusOptions
 {
-    public string ConnectionName { get; set; }
+    public string? ConnectionName { get; set; }
 
-    public string SubscriberName { get; set; }
+    public string SubscriberName { get; set; } = default!;
 
-    public string TopicName { get; set; }
+    public string TopicName { get; set; } = default!;
 
     public bool IsServiceBusDisabled { get; set; }
 }

framework/src/Volo.Abp.EventBus.Azure/Volo/Abp/EventBus/Azure/AzureDistributedEventBus.cs

@@ -30,7 +30,7 @@ public class AzureDistributedEventBus : DistributedEventBusBase, ISingletonDepen
     protected IAzureServiceBusSerializer Serializer { get; }
     protected ConcurrentDictionary<Type, List<IEventHandlerFactory>> HandlerFactories { get; }
     protected ConcurrentDictionary<string, Type> EventTypes  { get; }
-    protected IAzureServiceBusMessageConsumer Consumer  { get; private set; }
+    protected IAzureServiceBusMessageConsumer Consumer { get; private set; } = default!;
 
     public AzureDistributedEventBus(
         IServiceScopeFactory serviceScopeFactory,
@@ -268,7 +268,7 @@ public class AzureDistributedEventBus : DistributedEventBusBase, ISingletonDepen
     protected virtual async Task PublishAsync(
         string eventName,
         byte[] body,
-        [CanBeNull] string correlationId,
+        string? correlationId,
         Guid? eventId)
     {
         var message = new ServiceBusMessage(body)

framework/src/Volo.Abp.EventBus.Dapr/Volo.Abp.EventBus.Dapr.csproj

@@ -5,6 +5,8 @@
 
     <PropertyGroup>
         <TargetFramework>net7.0</TargetFramework>
+        <Nullable>enable</Nullable>
+        <WarningsAsErrors>Nullable</WarningsAsErrors>
         <RootNamespace />
     </PropertyGroup>
 

framework/src/Volo.Abp.EventBus.Dapr/Volo/Abp/EventBus/Dapr/AbpDaprEventData.cs

@@ -10,9 +10,9 @@ public class AbpDaprEventData
 
     public string JsonData { get; set; }
 
-    public string CorrelationId { get; set; }
+    public string? CorrelationId { get; set; }
 
-    public AbpDaprEventData(string pubSubName, string topic, string messageId, string jsonData, string correlationId)
+    public AbpDaprEventData(string pubSubName, string topic, string messageId, string jsonData, string? correlationId)
     {
         PubSubName = pubSubName;
         Topic = topic;

framework/src/Volo.Abp.EventBus.Dapr/Volo/Abp/EventBus/Dapr/DaprDistributedEventBus.cs

@@ -114,7 +114,7 @@ public class DaprDistributedEventBus : DistributedEventBusBase, ISingletonDepend
                 factories.RemoveAll(
                     factory =>
                         factory is SingleInstanceHandlerFactory &&
-                        (factory as SingleInstanceHandlerFactory).HandlerInstance == handler
+                        (factory as SingleInstanceHandlerFactory)!.HandlerInstance == handler
                 );
             });
     }
@@ -186,7 +186,7 @@ public class DaprDistributedEventBus : DistributedEventBusBase, ISingletonDepend
         }
     }
 
-    public virtual async Task TriggerHandlersAsync(Type eventType, object eventData, string messageId = null, string correlationId = null)
+    public virtual async Task TriggerHandlersAsync(Type eventType, object eventData, string? messageId = null, string? correlationId = null)
     {
         if (await AddToInboxAsync(messageId, EventNameAttribute.GetNameOrDefault(eventType), eventType, eventData, correlationId))
         {
@@ -245,15 +245,15 @@ public class DaprDistributedEventBus : DistributedEventBusBase, ISingletonDepend
 
     public Type GetEventType(string eventName)
     {
-        return EventTypes.GetOrDefault(eventName);
+        return EventTypes.GetOrDefault(eventName)!;
     }
 
-    protected virtual async Task PublishToDaprAsync(Type eventType, object eventData, Guid? messageId = null, string correlationId = null)
+    protected virtual async Task PublishToDaprAsync(Type eventType, object eventData, Guid? messageId = null, string? correlationId = null)
     {
         await PublishToDaprAsync(EventNameAttribute.GetNameOrDefault(eventType), eventData, messageId, correlationId);
     }
 
-    protected virtual async Task PublishToDaprAsync(string eventName, object eventData, Guid? messageId = null, string correlationId = null)
+    protected virtual async Task PublishToDaprAsync(string eventName, object eventData, Guid? messageId = null, string? correlationId = null)
     {
         var client = DaprClientFactory.Create();
         var data = new AbpDaprEventData(DaprEventBusOptions.PubSubName, eventName, (messageId ?? GuidGenerator.Create()).ToString("N"), Serializer.SerializeToString(eventData), correlationId);

framework/src/Volo.Abp.EventBus.Kafka/Volo.Abp.EventBus.Kafka.csproj

@@ -5,6 +5,8 @@
 
     <PropertyGroup>
         <TargetFrameworks>netstandard2.0;netstandard2.1;net7.0</TargetFrameworks>
+        <Nullable>enable</Nullable>
+        <WarningsAsErrors>Nullable</WarningsAsErrors>
         <RootNamespace />
     </PropertyGroup>
 

framework/src/Volo.Abp.EventBus.Kafka/Volo/Abp/EventBus/Kafka/AbpKafkaEventBusOptions.cs

@@ -3,9 +3,9 @@
 public class AbpKafkaEventBusOptions
 {
 
-    public string ConnectionName { get; set; }
+    public string? ConnectionName { get; set; }
 
-    public string TopicName { get; set; }
+    public string TopicName { get; set; } = default!;
 
-    public string GroupId { get; set; }
+    public string GroupId { get; set; } = default!;
 }

framework/src/Volo.Abp.EventBus.Kafka/Volo/Abp/EventBus/Kafka/KafkaDistributedEventBus.cs

@@ -29,7 +29,7 @@ public class KafkaDistributedEventBus : DistributedEventBusBase, ISingletonDepen
     protected IProducerPool ProducerPool { get; }
     protected ConcurrentDictionary<Type, List<IEventHandlerFactory>> HandlerFactories { get; }
     protected ConcurrentDictionary<string, Type> EventTypes { get; }
-    protected IKafkaMessageConsumer Consumer { get; private set; }
+    protected IKafkaMessageConsumer Consumer { get; private set; } = default!;
 
     public KafkaDistributedEventBus(
         IServiceScopeFactory serviceScopeFactory,

framework/src/Volo.Abp.EventBus.Kafka/Volo/Abp/EventBus/Kafka/MessageExtensions.cs

@@ -4,9 +4,9 @@ namespace Volo.Abp.EventBus.Kafka;
 
 public static class MessageExtensions
 {
-    public static string GetMessageId<TKey, TValue>(this Message<TKey, TValue> message)
+    public static string? GetMessageId<TKey, TValue>(this Message<TKey, TValue> message)
     {
-        string messageId = null;
+        string? messageId = null;
 
         if (message.Headers.TryGetLastBytes("messageId", out var messageIdBytes))
         {
@@ -16,9 +16,9 @@ public static class MessageExtensions
         return messageId;
     }
 
-    public static string GetCorrelationId<TKey, TValue>(this Message<TKey, TValue> message)
+    public static string? GetCorrelationId<TKey, TValue>(this Message<TKey, TValue> message)
     {
-        string correlationId = null;
+        string? correlationId = null;
 
         if (message.Headers.TryGetLastBytes(EventBusConsts.CorrelationIdHeaderName, out var correlationIdBytes))
         {

framework/src/Volo.Abp.EventBus.RabbitMQ/Volo.Abp.EventBus.RabbitMQ.csproj

@@ -5,6 +5,8 @@
 
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;netstandard2.1;net7.0</TargetFrameworks>
+    <Nullable>enable</Nullable>
+    <WarningsAsErrors>Nullable</WarningsAsErrors>
     <AssemblyName>Volo.Abp.EventBus.RabbitMQ</AssemblyName>
     <PackageId>Volo.Abp.EventBus.RabbitMQ</PackageId>
     <AssetTargetFallback>$(AssetTargetFallback);portable-net45+win8+wp8+wpa81;</AssetTargetFallback>

framework/src/Volo.Abp.EventBus.RabbitMQ/Volo/Abp/EventBus/RabbitMq/AbpRabbitMqEventBusOptions.cs

@@ -6,13 +6,13 @@ public class AbpRabbitMqEventBusOptions
 {
     public const string DefaultExchangeType = RabbitMqConsts.ExchangeTypes.Direct;
 
-    public string ConnectionName { get; set; }
+    public string? ConnectionName { get; set; }
 
-    public string ClientName { get; set; }
+    public string ClientName { get; set; } = default!;
 
-    public string ExchangeName { get; set; }
+    public string ExchangeName { get; set; } = default!;
 
-    public string ExchangeType { get; set; }
+    public string? ExchangeType { get; set; }
     
     public ushort? PrefetchCount { get; set; }
 
@@ -20,6 +20,6 @@ public class AbpRabbitMqEventBusOptions
     {
         return string.IsNullOrEmpty(ExchangeType)
             ? DefaultExchangeType
-            : ExchangeType;
+            : ExchangeType!;
     }
 }

framework/src/Volo.Abp.EventBus.RabbitMQ/Volo/Abp/EventBus/RabbitMq/RabbitMqDistributedEventBus.cs

@@ -35,7 +35,7 @@ public class RabbitMqDistributedEventBus : DistributedEventBusBase, ISingletonDe
     protected ConcurrentDictionary<Type, List<IEventHandlerFactory>> HandlerFactories { get; }
     protected ConcurrentDictionary<string, Type> EventTypes { get; }
     protected IRabbitMqMessageConsumerFactory MessageConsumerFactory { get; }
-    protected IRabbitMqMessageConsumer Consumer { get; private set; }
+    protected IRabbitMqMessageConsumer Consumer { get; private set; } = default!;
 
     private bool _exchangeCreated;
 
@@ -175,7 +175,7 @@ public class RabbitMqDistributedEventBus : DistributedEventBusBase, ISingletonDe
                 factories.RemoveAll(
                     factory =>
                         factory is SingleInstanceHandlerFactory &&
-                        (factory as SingleInstanceHandlerFactory).HandlerInstance == handler
+                        (factory as SingleInstanceHandlerFactory)!.HandlerInstance == handler
                 );
             });
     }
@@ -282,9 +282,9 @@ public class RabbitMqDistributedEventBus : DistributedEventBusBase, ISingletonDe
     public virtual Task PublishAsync(
         Type eventType,
         object eventData,
-        Dictionary<string, object> headersArguments = null,
+        Dictionary<string, object>? headersArguments = null,
         Guid? eventId = null,
-        [CanBeNull] string correlationId = null)
+        string? correlationId = null)
     {
         var eventName = EventNameAttribute.GetNameOrDefault(eventType);
         var body = Serializer.Serialize(eventData);
@@ -295,9 +295,9 @@ public class RabbitMqDistributedEventBus : DistributedEventBusBase, ISingletonDe
     protected virtual Task PublishAsync(
         string eventName,
         byte[] body,
-        Dictionary<string, object> headersArguments = null,
+        Dictionary<string, object>? headersArguments = null,
         Guid? eventId = null,
-        [CanBeNull] string correlationId = null)
+        string? correlationId = null)
     {
         using (var channel = ConnectionPool.Get(AbpRabbitMqEventBusOptions.ConnectionName).CreateModel())
         {
@@ -309,9 +309,9 @@ public class RabbitMqDistributedEventBus : DistributedEventBusBase, ISingletonDe
         IModel channel,
         string eventName,
         byte[] body,
-        Dictionary<string, object> headersArguments = null,
+        Dictionary<string, object>? headersArguments = null,
         Guid? eventId = null,
-        [CanBeNull] string correlationId = null)
+        string? correlationId = null)
     {
         EnsureExchangeExists(channel);
 
@@ -366,7 +366,7 @@ public class RabbitMqDistributedEventBus : DistributedEventBusBase, ISingletonDe
         _exchangeCreated = true;
     }
 
-    private void SetEventMessageHeaders(IBasicProperties properties, Dictionary<string, object> headersArguments)
+    private void SetEventMessageHeaders(IBasicProperties properties, Dictionary<string, object>? headersArguments)
     {
         if (headersArguments == null)
         {

framework/src/Volo.Abp.EventBus.Rebus/Volo.Abp.EventBus.Rebus.csproj

@@ -5,6 +5,8 @@
 
     <PropertyGroup>
         <TargetFrameworks>netstandard2.0;netstandard2.1;net7.0</TargetFrameworks>
+        <Nullable>enable</Nullable>
+        <WarningsAsErrors>Nullable</WarningsAsErrors>
         <AssemblyName>Volo.Abp.EventBus.Rebus</AssemblyName>
         <PackageId>Volo.Abp.EventBus.Rebus</PackageId>
         <AssetTargetFallback>$(AssetTargetFallback);portable-net45+win8+wp8+wpa81;</AssetTargetFallback>

framework/src/Volo.Abp.EventBus.Rebus/Volo/Abp/EventBus/Rebus/AbpRebusEventBusOptions.cs

@@ -11,7 +11,7 @@ namespace Volo.Abp.EventBus.Rebus;
 public class AbpRebusEventBusOptions
 {
     [NotNull]
-    public string InputQueueName { get; set; }
+    public string InputQueueName { get; set; } = default!;
 
     [NotNull]
     public Action<RebusConfigurer> Configurer {
@@ -20,7 +20,7 @@ public class AbpRebusEventBusOptions
     }
     private Action<RebusConfigurer> _configurer;
 
-    public Func<IBus, Type, object, Task> Publish { get; set; }
+    public Func<IBus, Type, object, Task>? Publish { get; set; }
 
     public AbpRebusEventBusOptions()
     {

framework/src/Volo.Abp.EventBus.Rebus/Volo/Abp/EventBus/Rebus/RebusDistributedEventBus.cs

@@ -165,7 +165,7 @@ public class RebusDistributedEventBus : DistributedEventBusBase, ISingletonDepen
         var headers = new Dictionary<string, string>();
         if (CorrelationIdProvider.Get() != null)
         {
-            headers.Add(EventBusConsts.CorrelationIdHeaderName, CorrelationIdProvider.Get());
+            headers.Add(EventBusConsts.CorrelationIdHeaderName, CorrelationIdProvider.Get()!);
         }
         await PublishAsync(eventType, eventData, headersArguments: headers);
     }
@@ -174,7 +174,7 @@ public class RebusDistributedEventBus : DistributedEventBusBase, ISingletonDepen
         Type eventType,
         object eventData,
         Guid? eventId = null,
-        Dictionary<string, string> headersArguments = null)
+        Dictionary<string, string>? headersArguments = null)
     {
         if (AbpRebusEventBusOptions.Publish != null)
         {
@@ -250,7 +250,7 @@ public class RebusDistributedEventBus : DistributedEventBusBase, ISingletonDepen
         OutgoingEventInfo outgoingEvent,
         OutboxConfig outboxConfig)
     {
-        var eventType = EventTypes.GetOrDefault(outgoingEvent.EventName);
+        var eventType = EventTypes.GetOrDefault(outgoingEvent.EventName)!;
         var eventData = Serializer.Deserialize(outgoingEvent.EventData, eventType);
 
         using (CorrelationIdProvider.Change(outgoingEvent.GetCorrelationId()))
@@ -265,7 +265,7 @@ public class RebusDistributedEventBus : DistributedEventBusBase, ISingletonDepen
         var headers = new Dictionary<string, string>();
         if (outgoingEvent.GetCorrelationId() != null)
         {
-            headers.Add(EventBusConsts.CorrelationIdHeaderName, outgoingEvent.GetCorrelationId());
+            headers.Add(EventBusConsts.CorrelationIdHeaderName, outgoingEvent.GetCorrelationId()!);
         }
 
         await PublishAsync(eventType, eventData, eventId: outgoingEvent.Id, headersArguments: headers);

framework/src/Volo.Abp.EventBus.Rebus/Volo/Abp/EventBus/Rebus/RebusDistributedEventHandlerAdapter.cs

@@ -14,6 +14,6 @@ public class RebusDistributedEventHandlerAdapter<TEventData> : IHandleMessages<T
 
     public async Task Handle(TEventData message)
     {
-        await RebusDistributedEventBus.ProcessEventAsync(message.GetType(), message);
+        await RebusDistributedEventBus.ProcessEventAsync(message!.GetType(), message);
     }
 }

framework/src/Volo.Abp.EventBus/Volo.Abp.EventBus.csproj

@@ -5,6 +5,8 @@
 
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;netstandard2.1;net7.0</TargetFrameworks>
+    <Nullable>enable</Nullable>
+    <WarningsAsErrors>Nullable</WarningsAsErrors>
     <AssemblyName>Volo.Abp.EventBus</AssemblyName>
     <PackageId>Volo.Abp.EventBus</PackageId>
     <AssetTargetFallback>$(AssetTargetFallback);portable-net45+win8+wp8+wpa81;</AssetTargetFallback>

framework/src/Volo.Abp.EventBus/Volo/Abp/EventBus/Distributed/DistributedEventBusBase.cs

@@ -133,7 +133,7 @@ public abstract class DistributedEventBusBase : EventBusBase, IDistributedEventB
                     Serialize(eventData),
                     Clock.Now
                 );
-                outgoingEventInfo.SetCorrelationId(CorrelationIdProvider.Get());
+                outgoingEventInfo.SetCorrelationId(CorrelationIdProvider.Get()!);
                 await eventOutbox.EnqueueAsync(outgoingEventInfo);
                 return true;
             }
@@ -148,11 +148,11 @@ public abstract class DistributedEventBusBase : EventBusBase, IDistributedEventB
     }
 
     protected async Task<bool> AddToInboxAsync(
-        string messageId,
+        string? messageId,
         string eventName,
         Type eventType,
         object eventData,
-        [CanBeNull] string correlationId)
+        string? correlationId)
     {
         if (AbpDistributedEventBusOptions.Inboxes.Count <= 0)
         {
@@ -170,7 +170,7 @@ public abstract class DistributedEventBusBase : EventBusBase, IDistributedEventB
 
                     if (!messageId.IsNullOrEmpty())
                     {
-                        if (await eventInbox.ExistsByMessageIdAsync(messageId))
+                        if (await eventInbox.ExistsByMessageIdAsync(messageId!))
                         {
                             continue;
                         }
@@ -178,12 +178,12 @@ public abstract class DistributedEventBusBase : EventBusBase, IDistributedEventB
 
                     var incomingEventInfo = new IncomingEventInfo(
                         GuidGenerator.Create(),
-                        messageId,
+                        messageId!,
                         eventName,
                         Serialize(eventData),
                         Clock.Now
                     );
-                    incomingEventInfo.SetCorrelationId(correlationId);
+                    incomingEventInfo.SetCorrelationId(correlationId!);
                     await eventInbox.EnqueueAsync(incomingEventInfo);
                 }
             }
@@ -206,7 +206,7 @@ public abstract class DistributedEventBusBase : EventBusBase, IDistributedEventB
         await TriggerHandlersAsync(eventType, eventData);
     }
 
-    protected virtual async Task TriggerHandlersFromInboxAsync(Type eventType, object eventData, List<Exception> exceptions, InboxConfig inboxConfig = null)
+    protected virtual async Task TriggerHandlersFromInboxAsync(Type eventType, object eventData, List<Exception> exceptions, InboxConfig? inboxConfig = null)
     {
         await TriggerDistributedEventReceivedAsync(new DistributedEventReceived
         {

framework/src/Volo.Abp.EventBus/Volo/Abp/EventBus/Distributed/InboxProcessor.cs

@@ -21,13 +21,13 @@ public class InboxProcessor : IInboxProcessor, ITransientDependency
     protected IAbpDistributedLock DistributedLock { get; }
     protected IUnitOfWorkManager UnitOfWorkManager { get; }
     protected IClock Clock { get; }
-    protected IEventInbox Inbox { get; private set; }
-    protected InboxConfig InboxConfig { get; private set; }
+    protected IEventInbox Inbox { get; private set; } = default!;
+    protected InboxConfig InboxConfig { get; private set; } = default!;
     protected AbpEventBusBoxesOptions EventBusBoxesOptions { get; }
 
     protected DateTime? LastCleanTime { get; set; }
 
-    protected string DistributedLockName { get; private set; }
+    protected string DistributedLockName { get; private set; } = default!;
     public ILogger<InboxProcessor> Logger { get; set; }
     protected CancellationTokenSource StoppingTokenSource { get; }
     protected CancellationToken StoppingToken { get; }

framework/src/Volo.Abp.EventBus/Volo/Abp/EventBus/Distributed/OutboxSender.cs

@@ -19,10 +19,10 @@ public class OutboxSender : IOutboxSender, ITransientDependency
     protected AbpAsyncTimer Timer { get; }
     protected IDistributedEventBus DistributedEventBus { get; }
     protected IAbpDistributedLock DistributedLock { get; }
-    protected IEventOutbox Outbox { get; private set; }
-    protected OutboxConfig OutboxConfig { get; private set; }
+    protected IEventOutbox Outbox { get; private set; } = default!;
+    protected OutboxConfig OutboxConfig { get; private set; } = default!;
     protected AbpEventBusBoxesOptions EventBusBoxesOptions { get; }
-    protected string DistributedLockName { get; private set; }
+    protected string DistributedLockName { get; private set; } = default!;
     public ILogger<OutboxSender> Logger { get; set; }
 
     protected CancellationTokenSource StoppingTokenSource { get; }

framework/src/Volo.Abp.EventBus/Volo/Abp/EventBus/EventBusBase.cs

@@ -131,7 +131,7 @@ public abstract class EventBusBase : IEventBus
         }
     }
 
-    protected virtual async Task TriggerHandlersAsync(Type eventType, object eventData, List<Exception> exceptions, InboxConfig inboxConfig = null)
+    protected virtual async Task TriggerHandlersAsync(Type eventType, object eventData, List<Exception> exceptions, InboxConfig? inboxConfig = null)
     {
         await new SynchronizationContextRemover();
 
@@ -154,7 +154,7 @@ public abstract class EventBusBase : IEventBus
             {
                 var baseEventType = eventType.GetGenericTypeDefinition().MakeGenericType(baseArg);
                 var constructorArgs = ((IEventDataWithInheritableGenericArgument)eventData).GetConstructorArgs();
-                var baseEventData = Activator.CreateInstance(baseEventType, constructorArgs);
+                var baseEventData = Activator.CreateInstance(baseEventType, constructorArgs)!;
                 await PublishToEventBusAsync(baseEventType, baseEventData);
             }
         }
@@ -197,7 +197,7 @@ public abstract class EventBusBase : IEventBus
     protected abstract IEnumerable<EventTypeWithEventHandlerFactories> GetHandlerFactories(Type eventType);
 
     protected virtual async Task TriggerHandlerAsync(IEventHandlerFactory asyncHandlerFactory, Type eventType,
-        object eventData, List<Exception> exceptions, InboxConfig inboxConfig = null)
+        object eventData, List<Exception> exceptions, InboxConfig? inboxConfig = null)
     {
         using (var eventHandlerWrapper = asyncHandlerFactory.GetHandler())
         {
@@ -218,7 +218,7 @@ public abstract class EventBusBase : IEventBus
             }
             catch (TargetInvocationException ex)
             {
-                exceptions.Add(ex.InnerException);
+                exceptions.Add(ex.InnerException!);
             }
             catch (Exception ex)
             {

framework/src/Volo.Abp.EventBus/Volo/Abp/EventBus/EventHandlerDisposeWrapper.cs

@@ -6,9 +6,9 @@ public class EventHandlerDisposeWrapper : IEventHandlerDisposeWrapper
 {
     public IEventHandler EventHandler { get; }
 
-    private readonly Action _disposeAction;
+    private readonly Action? _disposeAction;
 
-    public EventHandlerDisposeWrapper(IEventHandler eventHandler, Action disposeAction = null)
+    public EventHandlerDisposeWrapper(IEventHandler eventHandler, Action? disposeAction = null)
     {
         _disposeAction = disposeAction;
         EventHandler = eventHandler;

framework/src/Volo.Abp.EventBus/Volo/Abp/EventBus/EventHandlerInvoker.cs

@@ -23,12 +23,12 @@ public class EventHandlerInvoker : IEventHandlerInvoker, ISingletonDependency
 
             if (typeof(ILocalEventHandler<>).MakeGenericType(eventType).IsInstanceOfType(eventHandler))
             {
-                item.Local = (IEventHandlerMethodExecutor)Activator.CreateInstance(typeof(LocalEventHandlerMethodExecutor<>).MakeGenericType(eventType));
+                item.Local = (IEventHandlerMethodExecutor?)Activator.CreateInstance(typeof(LocalEventHandlerMethodExecutor<>).MakeGenericType(eventType));
             }
 
             if (typeof(IDistributedEventHandler<>).MakeGenericType(eventType).IsInstanceOfType(eventHandler))
             {
-                item.Distributed = (IEventHandlerMethodExecutor)Activator.CreateInstance(typeof(DistributedEventHandlerMethodExecutor<>).MakeGenericType(eventType));
+                item.Distributed = (IEventHandlerMethodExecutor?)Activator.CreateInstance(typeof(DistributedEventHandlerMethodExecutor<>).MakeGenericType(eventType));
             }
 
             return item;

framework/src/Volo.Abp.EventBus/Volo/Abp/EventBus/EventHandlerInvokerCacheItem.cs

@@ -2,7 +2,7 @@
 
 public class EventHandlerInvokerCacheItem
 {
-    public IEventHandlerMethodExecutor Local { get; set; }
+    public IEventHandlerMethodExecutor? Local { get; set; }
 
-    public IEventHandlerMethodExecutor Distributed { get; set; }
+    public IEventHandlerMethodExecutor? Distributed { get; set; }
 }

framework/src/Volo.Abp.EventBus/Volo/Abp/EventBus/Local/LocalEventBus.cs

@@ -105,7 +105,7 @@ public class LocalEventBus : EventBusBase, ILocalEventBus, ISingletonDependency
                 factories.RemoveAll(
                     factory =>
                         factory is SingleInstanceHandlerFactory &&
-                        (factory as SingleInstanceHandlerFactory).HandlerInstance == handler
+                        ((factory as SingleInstanceHandlerFactory)!).HandlerInstance == handler
                 );
             });
     }
@@ -177,7 +177,7 @@ public class LocalEventBus : EventBusBase, ILocalEventBus, ISingletonDependency
     }
 
     // Internal for unit testing
-    internal Func<Type, object, Task> OnEventHandleInvoking { get; set; }
+    internal Func<Type, object, Task>? OnEventHandleInvoking { get; set; }
 
     // Internal for unit testing
     protected async override Task InvokeEventHandlerAsync(IEventHandler eventHandler, object eventData, Type eventType)
@@ -191,7 +191,7 @@ public class LocalEventBus : EventBusBase, ILocalEventBus, ISingletonDependency
     }
 
     // Internal for unit testing
-    internal Func<Type, object, Task> OnPublishing { get; set; }
+    internal Func<Type, object, Task>? OnPublishing { get; set; }
 
     // For unit testing
     public async override Task PublishAsync(

framework/src/Volo.Abp.EventBus/Volo/Abp/EventBus/TransientEventHandlerFactory.cs

@@ -64,6 +64,6 @@ public class TransientEventHandlerFactory : IEventHandlerFactory
 
     protected virtual IEventHandler CreateHandler()
     {
-        return (IEventHandler)Activator.CreateInstance(HandlerType);
+        return (IEventHandler)Activator.CreateInstance(HandlerType)!;
     }
 }