Elsa Workflows Declarative Example

ElsaWorkflowsDeclarative.cs

// Create a service container with Elsa services.
var services = new ServiceCollection()
    .AddElsa()
    // For production use.
    .UseYesSqlPersistence()
    // Or use any of the other supported persistence providers such as EF Core or MongoDB:
    // .UseEntityFrameworkPersistence(ef => ef.UseSqlite())
    // .UseMongoDbPersistence()
    .BuildServiceProvider();

// Run startup actions (not needed when registering Elsa with a Host).
var startupRunner = services.GetRequiredService<IStartupRunner>();
await startupRunner.StartupAsync();

// Define a workflow.
var workflowDefinition = new WorkflowDefinition
{
    WorkflowDefinitionId = "SampleWorkflow",
    WorkflowDefinitionVersionId = "1", 
    Version = 1,
    IsPublished = true,
    IsLatest = true,
    IsEnabled = true,
    PersistenceBehavior = WorkflowPersistenceBehavior.Suspended,
    Activities = new[]
    {
        new ActivityDefinition
        {
            ActivityId = "activity-1",
            Type = nameof(WriteLine),
            Properties = new ActivityDefinitionProperties
            {
                [nameof(WriteLine.Text)] = new ActivityDefinitionPropertyValue
                {
                    Syntax = "Literal",
                    Expression = "Hello World!",
                    Type = typeof(string)
                }
            }
        }, 
    }
};

// Serialize workflow definition to JSON.
var serializer = services.GetRequiredService<IContentSerializer>();
var json = serializer.Serialize(workflowDefinition);

// Deserialize workflow definition from JSON.
var deserializedWorkflowDefinition = serializer.Deserialize<WorkflowDefinition>(json);

// Materialize workflow.
var materializer = services.GetRequiredService<IWorkflowBlueprintMaterializer>();
var workflowBlueprint = materializer.CreateWorkflowBlueprint(deserializedWorkflowDefinition);

// Execute workflow.
var workflowRunner = services.GetRequiredService<IWorkflowRunner>();
await workflowRunner.RunWorkflowAsync(workflowBlueprint);