Loading Workflows from JSON

1. Generate a new Console application using the following command:

   dotnet new console -n "ElsaConsole" -f net8.0
   cd ElsaConsole
   dotnet add package Elsa
   dotnet add package Elsa.Testing.Shared

2. Here's a complete Program.cs file that demonstrates how to load a workflow from a JSON file and execute it:

   Program.cs

   using Elsa.Extensions;
   using Elsa.Testing.Shared;
   using Elsa.Workflows.Contracts;
   using Elsa.Workflows.Management.Mappers;
   using Elsa.Workflows.Management.Models;
   using Microsoft.Extensions.DependencyInjection;
   
   // Setup service container.
   var services = new ServiceCollection();
   
   // Add Elsa services.
   services.AddElsa();
   
   // Build service container.
   var serviceProvider = services.BuildServiceProvider();
   
   // Populate registries. This is only necessary for applications  that are not using hosted services.
   await serviceProvider.PopulateRegistriesAsync();
   
   // Import a workflow from a JSON file.
   var workflowJson = await File.ReadAllTextAsync("HelloWorld.json");
   
   // Get a serializer to deserialize the workflow.
   var serializer = serviceProvider.GetRequiredService<IActivitySerializer>();
   
   // Deserialize the workflow model.
   var workflowDefinitionModel = serializer.Deserialize<WorkflowDefinitionModel>(workflowJson);
   
   // Map the model to a Workflow object.
   var workflowDefinitionMapper = serviceProvider.GetRequiredService<WorkflowDefinitionMapper>();
   var workflow = workflowDefinitionMapper.Map(workflowDefinitionModel);
   
   // Resolve a workflow runner to run the workflow.
   var workflowRunner = serviceProvider.GetRequiredService<IWorkflowRunner>();
   
   // Run the workflow.
   await workflowRunner.RunAsync(workflow);

3. Create a new file called HelloWorld.json in the root of the project and make sure it is configured to be copied to the output directory. HelloWorld.json

   {
     "id": "HelloWorld-v1",
     "definitionId": "HelloWorld",
     "name": "Hello World",
     "isLatest": true,
     "isPublished": true,
     "root": {
       "id": "Flowchart1",
       "type": "Elsa.Flowchart",
       "activities": [
         {
           "id": "WriteLine1",
           "type": "Elsa.WriteLine",
           "text": {
             "typeName": "String",
             "expression": {
               "type": "Literal",
               "value": "Hello World!"
             }
           }
         }
       ]
     }
   }

4. Run the program using the following command:

   dotnet run

The console should output the following:

Hello World!

1. Setup an Elsa Server project.

2. Create a new folder called Workflows

3. Create a new file called HelloWorld.json in the root of the project and make sure it is configured to be copied to the output directory. HelloWorld.json

   {
     "id": "HelloWorld-v1",
     "definitionId": "HelloWorld",
     "name": "Hello World",
     "isLatest": true,
     "isPublished": true,
     "root": {
       "id": "Flowchart1",
       "type": "Elsa.Flowchart",
       "activities": [
         {
           "id": "WriteLine1",
           "type": "Elsa.WriteLine",
           "text": {
             "typeName": "String",
             "expression": {
               "type": "Literal",
               "value": "Hello World!"
             }
           }
         }
       ]
     }
   }

4. Run the application using the following command:

   dotnet run --urls "https://localhost:5001"

5. Execute the workflow using the following curl:

   curl --location --request POST 'https://localhost:5001/elsa/api/workflow-definitions/HelloWorld/execute' \
   --header 'Authorization: ApiKey {your-api-key}'

   Alternatively, start ab Elsa Studio container and run the workflow from there