Refactor to use primary constructors from .net8

samples/AzureFunctionsApp/Entities/Counter.cs

@@ -30,18 +30,11 @@ namespace AzureFunctionsApp.Entities;
 /// the added benefit of being able to use DI. When using TaskEntity<TState>, state is deserialized to the "State"
 /// property. No other properties on this type will be serialized/deserialized.
 /// </summary>
-public class Counter : TaskEntity<int>
+public class Counter(ILogger<Counter> logger) : TaskEntity<int>
 {
-    readonly ILogger logger;
-
-    public Counter(ILogger<Counter> logger)
-    {
-        this.logger = logger;
-    }
-
     public int Add(int input)
     {
-        this.logger.LogInformation("Adding {Input} to {State}", input, this.State);
+        logger.LogInformation("Adding {Input} to {State}", input, this.State);
         return this.State += input;
     }
 

samples/AzureFunctionsApp/Entities/Lifetime.cs

@@ -17,15 +17,8 @@ namespace AzureFunctionsApp.Entities;
 /// is also possible to design an entity which remains stateless by always returning <c>null</c> from
 /// <see cref="InitializeState"/> and never assigning a non-null state.
 /// </summary>
-public class Lifetime : TaskEntity<MyState>
+public class Lifetime(ILogger<Lifetime> logger) : TaskEntity<MyState>
 {
-    readonly ILogger logger;
-
-    public Lifetime(ILogger<Lifetime> logger)
-    {
-        this.logger = logger;
-    }
-
     /// <summary>
     /// Optional property to override. When 'true', this will allow dispatching of operations to the <see cref="State">
     /// object if there is no matching method on the entity. Default is 'false'.
@@ -39,7 +32,7 @@ public Lifetime(ILogger<Lifetime> logger)
     [Function(nameof(Lifetime))]
     public Task DispatchAsync([EntityTrigger] TaskEntityDispatcher dispatcher)
     {
-        this.logger.LogInformation("Dispatching entity");
+        logger.LogInformation("Dispatching entity");
         return dispatcher.DispatchAsync(this);
     }
 

samples/AzureFunctionsApp/Entities/User.cs

@@ -19,29 +19,21 @@ public record UserUpdate(string? Name, int? Age);
 /// <summary>
 /// This sample demonstrates how to bind to <see cref="TaskEntityContext"/> as well as dispatch to orchestrations.
 /// </summary>
-public class UserEntity : TaskEntity<User>
+public class UserEntity(ILogger<UserEntity> logger) : TaskEntity<User>
 {
-    readonly ILogger logger;
-
-    public UserEntity(ILogger<UserEntity> logger)
-    {
-        this.logger = logger;
-    }
-
     public void Set(User user)
     {
         User previous = this.State;
         this.State = user;
-        this.logger.LogInformation("User {Id} set {Old} -> {New}", this.Context.Id.Key, previous, this.State);
+        logger.LogInformation("User {Id} set {Old} -> {New}", this.Context.Id.Key, previous, this.State);
     }
 
     public void Update(UserUpdate update)
     {
         (string n, int a) = (update.Name ?? this.State.Name, update.Age ?? this.State.Age);
         User previous = this.State;
         this.State = previous with { Name = n, Age = a };
-
-        this.logger.LogInformation("User {Id} updated {Old} -> {New}", this.Context.Id.Key, previous, this.State);
+        logger.LogInformation("User {Id} updated {Old} -> {New}", this.Context.Id.Key, previous, this.State);
     }
 
     /// <summary>
@@ -55,7 +47,7 @@ public void Greet(TaskEntityContext context, string? message = null)
     {
         if (this.State.Name is null)
         {
-            this.logger.LogError("User is not in a valid state for a greet operation.");
+            logger.LogError("User is not in a valid state for a greet operation.");
             throw new InvalidOperationException("User has not been initialized.");
         }
 

samples/AzureFunctionsApp/HelloCitiesTyped.cs

@@ -63,28 +63,19 @@ public async override Task<string> RunAsync(TaskOrchestrationContext context, st
 /// Class-based activity function implementation. Source generators are used to a generate an activity function
 /// definition that creates an instance of this class and invokes its <see cref="OnRun"/> method.
 /// </summary>
+/// <remarks>
+/// This class is initialized once for every activity execution.
+/// Activity class constructors support constructor-based dependency injection.
+/// The injected services are provided by the function's <see cref="FunctionContext.InstanceServices"/> property.
+/// </remarks>
+/// <param name="logger">The logger injected by the Azure Functions runtime.</param>
 [DurableTask(nameof(SayHelloTyped))]
-public class SayHelloTyped : TaskActivity<string, string>
+public class SayHelloTyped(ILogger<SayHelloTyped> logger)
+    : TaskActivity<string, string>
 {
-    readonly ILogger logger;
-
-    /// <summary>
-    /// Initializes a new instance of the <see cref="SayHelloTyped"/> class.
-    /// This class is initialized once for every activity execution.
-    /// </summary>
-    /// <remarks>
-    /// Activity class constructors support constructor-based dependency injection.
-    /// The injected services are provided by the function's <see cref="FunctionContext.InstanceServices"/> property.
-    /// </remarks>
-    /// <param name="logger">The logger injected by the Azure Functions runtime.</param>
-    public SayHelloTyped(ILogger<SayHelloTyped> logger)
-    {
-        this.logger = logger;
-    }
-
     public override Task<string> RunAsync(TaskActivityContext context, string cityName)
     {
-        this.logger.LogInformation("Saying hello to {name}", cityName);
+        logger.LogInformation("Saying hello to {name}", cityName);
         return Task.FromResult($"Hello, {cityName}!");
     }
 }

samples/AzureFunctionsApp/Program.cs

@@ -2,16 +2,9 @@
 // Licensed under the MIT License.
 
 using Microsoft.Extensions.Hosting;
-namespace AzureFunctionsApp;
 
-public class Program
-{
-    public static void Main()
-    {
-        IHost host = new HostBuilder()
-            .ConfigureFunctionsWorkerDefaults()
-            .Build();
+IHost host = new HostBuilder()
+    .ConfigureFunctionsWorkerDefaults()
+    .Build();
 
-        host.Run();
-    }
-}
+host.Run();

samples/WebAPI/Controllers/OrderProcessingController.cs

@@ -10,15 +10,8 @@ namespace WebAPI.Controllers;
 
 [Route("orders")]
 [ApiController]
-public class OrderProcessingController : ControllerBase
+public class OrderProcessingController(DurableTaskClient durableTaskClient) : ControllerBase
 {
-    readonly DurableTaskClient durableTaskClient;
-
-    public OrderProcessingController(DurableTaskClient durableTaskClient)
-    {
-        this.durableTaskClient = durableTaskClient;
-    }
-
     // HTTPie command:
     // http POST http://localhost:8080/orders/new Item=catfood Quantity=5 Price=600
     [HttpPost("new")]
@@ -31,7 +24,7 @@ public async Task<ActionResult> CreateOrder([FromBody] OrderInfo orderInfo)
 
         // Generate an order ID and start the order processing workflow orchestration
         string orderId = $"{orderInfo.Item}-{Guid.NewGuid().ToString()[..4]}";
-        await this.durableTaskClient.ScheduleNewProcessOrderOrchestratorInstanceAsync(
+        await durableTaskClient.ScheduleNewProcessOrderOrchestratorInstanceAsync(
             orderInfo, new StartOrchestrationOptions() { InstanceId = orderId });
 
         // Return 202 with a link to the GetOrderStatus API
@@ -45,7 +38,7 @@ await this.durableTaskClient.ScheduleNewProcessOrderOrchestratorInstanceAsync(
     [HttpGet("{orderId}")]
     public async Task<ActionResult> GetOrderStatus(string orderId)
     {
-        OrchestrationMetadata? metadata = await this.durableTaskClient.GetInstancesAsync(
+        OrchestrationMetadata? metadata = await durableTaskClient.GetInstancesAsync(
             instanceId: orderId,
             getInputsAndOutputs: true);
 

samples/WebAPI/Orchestrations/ChargeCustomerActivity.cs

@@ -7,19 +7,11 @@
 namespace WebAPI.Orchestrations;
 
 [DurableTask("ChargeCustomer")]
-public class ChargeCustomerActivity : TaskActivity<OrderInfo, object?>
+public class ChargeCustomerActivity(ILogger<ChargeCustomerActivity> logger) : TaskActivity<OrderInfo, object?>
 {
-    readonly ILogger logger;
-
-    // Dependencies are injected from ASP.NET host service container
-    public ChargeCustomerActivity(ILogger<ChargeCustomerActivity> logger)
-    {
-        this.logger = logger;
-    }
-
     public override async Task<object?> RunAsync(TaskActivityContext context, OrderInfo orderInfo)
     {
-        this.logger.LogInformation(
+        logger.LogInformation(
             "{instanceId}: Charging customer {price:C}'...",
             context.InstanceId,
             orderInfo?.Price ?? 0.0);

samples/WebAPI/Orchestrations/CheckInventoryActivity.cs

@@ -4,31 +4,19 @@
 using Microsoft.DurableTask;
 using WebAPI.Models;
 
-namespace WebAPI.Orchestrations
+namespace WebAPI.Orchestrations;
+
+[DurableTask("CheckInventory")]
+public class CheckInventoryActivity(ILogger<CheckInventoryActivity> logger)
+    : TaskActivity<OrderInfo, bool>
 {
-    [DurableTask("CheckInventory")]
-    public class CheckInventoryActivity : TaskActivity<OrderInfo, bool>
+    public override Task<bool> RunAsync(TaskActivityContext context, OrderInfo orderInfo)
     {
-        readonly ILogger logger;
-
-        // Dependencies are injected from ASP.NET host service container
-        public CheckInventoryActivity(ILogger<CheckInventoryActivity> logger)
-        {
-            this.logger = logger;
-        }
-
-        public override Task<bool> RunAsync(TaskActivityContext context, OrderInfo orderInfo)
-        {
-            if (orderInfo == null)
-            {
-                throw new ArgumentException("Failed to read order info!");
-            }
-
-            this.logger.LogInformation(
-                "{instanceId}: Checking inventory for '{item}'...found some!",
-                context.InstanceId,
-                orderInfo.Item);
-            return Task.FromResult(true);
-        }
+        ArgumentNullException.ThrowIfNull(context);
+        logger.LogInformation(
+            "{instanceId}: Checking inventory for '{item}'...found some!",
+            context.InstanceId,
+            orderInfo.Item);
+        return Task.FromResult(true);
     }
 }

samples/WebAPI/Orchestrations/CreateShipmentActivity.cs

@@ -7,19 +7,12 @@
 namespace WebAPI.Orchestrations;
 
 [DurableTask("CreateShipment")]
-public class CreateShipmentActivity : TaskActivity<OrderInfo, object?>
+public class CreateShipmentActivity(ILogger<CreateShipmentActivity> logger)
+    : TaskActivity<OrderInfo, object?>
 {
-    readonly ILogger logger;
-
-    // Dependencies are injected from ASP.NET host service container
-    public CreateShipmentActivity(ILogger<CreateShipmentActivity> logger)
-    {
-        this.logger = logger;
-    }
-
     public override async Task<object?> RunAsync(TaskActivityContext context, OrderInfo orderInfo)
     {
-        this.logger.LogInformation(
+        logger.LogInformation(
             "{instanceId}: Shipping customer order of {quantity} {item}(s)...",
             context.InstanceId,
             orderInfo?.Quantity ?? 0,

src/Abstractions/Converters/JsonDataConverter.cs

@@ -8,24 +8,16 @@ namespace Microsoft.DurableTask.Converters;
 /// <summary>
 /// An implementation of <see cref="DataConverter"/> that uses System.Text.Json APIs for data serialization.
 /// </summary>
-public class JsonDataConverter : DataConverter
+/// <param name="options">The serializer options.</param>
+public class JsonDataConverter(JsonSerializerOptions? options = null) : DataConverter
 {
     // WARNING: Changing default serialization options could potentially be breaking for in-flight orchestrations.
     static readonly JsonSerializerOptions DefaultOptions = new()
     {
         IncludeFields = true,
     };
 
-    readonly JsonSerializerOptions? options;
-
-    /// <summary>
-    /// Initializes a new instance of the <see cref="JsonDataConverter"/> class.
-    /// </summary>
-    /// <param name="options">The serializer options.</param>
-    public JsonDataConverter(JsonSerializerOptions? options = null)
-    {
-        this.options = options ?? DefaultOptions;
-    }
+    readonly JsonSerializerOptions? options = options ?? DefaultOptions;
 
     /// <summary>
     /// Gets an instance of the <see cref="JsonDataConverter"/> with default configuration.

src/Abstractions/DurableTaskAttribute.cs

@@ -12,23 +12,14 @@ namespace Microsoft.DurableTask;
 /// It is used specifically by build-time source generators to generate type-safe methods for invoking
 /// orchestrations or activities.
 /// </remarks>
+/// <param name="name">
+/// The name of the durable task. If not specified, the class name is used as the implied name of the durable task.
+/// </param>
 [AttributeUsage(AttributeTargets.Class, AllowMultiple = false, Inherited = false)]
-public sealed class DurableTaskAttribute : Attribute
+public sealed class DurableTaskAttribute(string? name = null) : Attribute
 {
-    /// <summary>
-    /// Initializes a new instance of the <see cref="DurableTaskAttribute"/> class.
-    /// </summary>
-    /// <param name="name">
-    /// The name of the durable task. If not specified, the class name is used as the implied name of the durable task.
-    /// </param>
-    public DurableTaskAttribute(string? name = null)
-    {
-        // This logic cannot become too complex as code-generator relies on examining the constructor arguments.
-        this.Name = string.IsNullOrEmpty(name) ? default : new TaskName(name!);
-    }
-
     /// <summary>
     /// Gets the name of the durable task.
     /// </summary>
-    public TaskName Name { get; }
+    public TaskName Name { get; } = string.IsNullOrEmpty(name) ? default : new TaskName(name!);
 }

src/Abstractions/Entities/EntityOperationFailedException.cs

@@ -10,36 +10,27 @@ namespace Microsoft.DurableTask.Entities;
 /// Detailed information associated with a particular operation failure, including exception details, can be found in the
 /// <see cref="FailureDetails"/> property.
 /// </remarks>
-public sealed class EntityOperationFailedException : Exception
+/// <param name="operationName">The operation name.</param>
+/// <param name="entityId">The entity ID.</param>
+/// <param name="failureDetails">The failure details.</param>
+public sealed class EntityOperationFailedException(
+    EntityInstanceId entityId, string operationName, TaskFailureDetails failureDetails)
+    : Exception(GetExceptionMessage(operationName, entityId, failureDetails))
 {
-    /// <summary>
-    /// Initializes a new instance of the <see cref="EntityOperationFailedException"/> class.
-    /// </summary>
-    /// <param name="operationName">The operation name.</param>
-    /// <param name="entityId">The entity ID.</param>
-    /// <param name="failureDetails">The failure details.</param>
-    public EntityOperationFailedException(EntityInstanceId entityId, string operationName, TaskFailureDetails failureDetails)
-        : base(GetExceptionMessage(operationName, entityId, failureDetails))
-    {
-        this.EntityId = entityId;
-        this.OperationName = operationName;
-        this.FailureDetails = failureDetails;
-    }
-
     /// <summary>
     /// Gets the ID of the entity.
     /// </summary>
-    public EntityInstanceId EntityId { get; }
+    public EntityInstanceId EntityId { get; } = entityId;
 
     /// <summary>
     /// Gets the name of the operation.
     /// </summary>
-    public string OperationName { get; }
+    public string OperationName { get; } = operationName;
 
-     /// <summary>
+    /// <summary>
     /// Gets the details of the task failure, including exception information.
     /// </summary>
-    public TaskFailureDetails FailureDetails { get; }
+    public TaskFailureDetails FailureDetails { get; } = failureDetails;
 
     static string GetExceptionMessage(string operationName, EntityInstanceId entityId, TaskFailureDetails failureDetails)
     {