elsa-core自定義Activity創建Bookmark人工任務完成

//實現一個自定的activity用於人工處理的節點
public class MyRunTask : Activity<object>
    {
        [Input(Description = "The name of the task being requested.")]
        public Input<string> TaskName { get; set; } = default!;
        /// <inheritdoc />
        /// <inheritdoc />
        [JsonConstructor]
        private MyRunTask(string? source = default, int? line = default) : base(source, line)
        {
        }

        /// <inheritdoc />
        public MyRunTask(MemoryBlockReference output, [CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(output, source, line)
        {
        }

        /// <inheritdoc />
        public MyRunTask(Output<object>? output, [CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(output, source, line)
        {
        }

        /// <inheritdoc />
        public MyRunTask(string taskName, [CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : this(new Literal<string>(taskName), source, line)
        {
        }
        /// <inheritdoc />
        /// <inheritdoc />
        public MyRunTask(Func<string> taskName, [CallerFilePath] string? source = default, [CallerLineNumber] int? line = default)
            : this(new Input<string>(Expression.DelegateExpression(taskName), new MemoryBlockReference()), source, line)
        {
        }

        /// <inheritdoc />
        public MyRunTask(Func<ExpressionExecutionContext, string?> taskName, [CallerFilePath] string? source = default, [CallerLineNumber] int? line = default)
            : this(new Input<string>(Expression.DelegateExpression(taskName), new MemoryBlockReference()), source, line)
        {
        }

        /// <inheritdoc />
        public MyRunTask(Variable<string> taskName, [CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line) => TaskName = new Input<string>(taskName);

        /// <inheritdoc />
        public MyRunTask(Literal<string> taskName, [CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : base(source, line) => TaskName = new Input<string>(taskName);

        /// <inheritdoc />
        public MyRunTask(Input<string> taskName, [CallerFilePath] string? source = default, [CallerLineNumber] int? line = default) : this(source, line) => TaskName = taskName;

        protected override async ValueTask ExecuteAsync(ActivityExecutionContext context)
        {
            // Create bookmark.
            var taskName = TaskName.Get(context);
            var identityGenerator = context.GetRequiredService<IIdentityGenerator>();
            var taskId = identityGenerator.GenerateId();
            var payload = new RunTaskBookmarkPayload(taskId, taskName);
            context.CreateBookmark(payload, ResumeAsync, includeActivityInstanceId: false);

            await ValueTask.CompletedTask;
        }
        public const string InputKey = "RunTaskInput";
        private async ValueTask ResumeAsync(ActivityExecutionContext context)
        {
            var input = context.GetWorkflowInput<object>(InputKey);
            Console.WriteLine($"-------------------{this}-----input={input}");
            
            context.Set(Result, input);
            await context.CompleteActivityAsync();
        }
    }

public class MyWorkflow : WorkflowBase
{
    protected override void Build(IWorkflowBuilder builder)
    {
        var employee = builder.WithVariable<Employee>().WithWorkflowStorage();

        builder.Root = new Sequence
        {
            Activities =
        {
            // Capture the workflow input (the employee to onboard).
            new SetVariable
            {
                Variable = employee,
                Value = new(context => context.GetInput<Employee>("Employee"))
            },
            // First thing we need to do is get an email account setup.
            new MyRunTask("科室主任")
            {

            },
              new MyRunTask("副總經理")
            {

            },
             new MyRunTask("總經理")
            {

            },
            // Onboarding has completed.
            new Finish()
        }
        };
    }
}



    [ApiController]
    [Route("[controller]")]
    public class HomeController : ControllerBase
    {
        private readonly IWorkflowDispatcher workflowDispatcher;

        public HomeController(IWorkflowDispatcher workflowDispatcher)
        { 
            this.workflowDispatcher = workflowDispatcher;
        }
        [HttpPost]
        [HttpPost("complete")]
        public async Task<string> Complete(string taskId, object? result = default)
        {
            var bookmarkPayload = new RunTaskBookmarkPayload(taskId, default!);

            var input = new Dictionary<string, object>
            {
                [RunTask.InputKey] = result!
            };

            var activityTypeName = ActivityTypeNameHelper.GenerateTypeName<MyRunTask>();
            var request = new DispatchResumeWorkflowsRequest(activityTypeName, bookmarkPayload, Input: input);
            await workflowDispatcher.DispatchAsync(request);
            return taskId + result;
        }
    }

 
使用postman測試
1、啓動工作流：post http://localhost:51238/elsa/api/workflow-definitions/MyWorkflow/execute
2、獲取工作流實例的執行狀態：get http://localhost:51238/elsa/api/workflow-instances/f407c64cec823692
3、完成當前任務：post http://localhost:51238/home/complete?taskid=d1a4507097abfb0c    我的這個流程需要執行三次，沒執行一次使用2重新獲取，
　　注意使用：post http://localhost:51238/elsa/api/tasks/47b1b97bc2ef4835/complete 不能實現當前任務的完成，原因是自定義的Activity和引擎帶的RunTask是不一樣的