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| # experimental | ||
| # Elsa Workflows | ||
|
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| [](https://www.nuget.org/packages/Elsa/) | ||
| [](https://github.com/elsa-workflows/elsa-core/actions/workflows/ci.yml) | ||
| [](https://discord.gg/hhChk5H472) | ||
| []( https://stackoverflow.com/questions/tagged/elsa-workflows ) | ||
| [](https://www.reddit.com/r/elsaworkflows/) | ||
|
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| Elsa is a workflows library that enables workflow execution in any .NET application. Workflows can be defined in a variety of ways: | ||
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| - Using C# code | ||
| - Using a designer | ||
| - Using JSON | ||
| - Using a custom DSL | ||
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| ## Documentation | ||
| Please checkout the [documentation website](https://v3.elsaworkflows.io/) to get started. | ||
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| ## Features | ||
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| Here are some of the more important features offered by Elsa: | ||
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| - Execute workflows in any .NET app. | ||
| - Supports both short-running and long-running workflows. | ||
| - Programming model loosely inspired on WF4 (composable activities). | ||
| - Support for complex activities such as Sequence, Flowchart and custom composite activities (which are like mini-workflows that can be used as activities). | ||
| - Ships with a workflows designer web component (currently supports Flowchart diagrams only). | ||
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| ## Console Examples | ||
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| ### Hello World | ||
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| The following is a simple Hello World workflow created as a console application. The workflow is created using C#. | ||
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| ```csharp | ||
| using Elsa.Extensions; | ||
| using Elsa.Workflows.Core.Activities; | ||
| using Elsa.Workflows.Core.Services; | ||
| using Microsoft.Extensions.DependencyInjection; | ||
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| // Setup service container. | ||
| var services = new ServiceCollection(); | ||
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| // Add Elsa services. | ||
| services.AddElsa(); | ||
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| // Build service container. | ||
| var serviceProvider = services.BuildServiceProvider(); | ||
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| // Create a workflow. | ||
| var workflow = new WriteLine("Hello World!"); | ||
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| // Resolve a workflow runner to run the workflow. | ||
| var workflowRunner = serviceProvider.GetRequiredService<IWorkflowRunner>(); | ||
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| // Run the workflow. | ||
| await workflowRunner.RunAsync(workflow); | ||
| ``` | ||
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| Outputs: | ||
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| ```shell | ||
| Hello World! | ||
| ``` | ||
|
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| ### Sequential workflows | ||
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| To build workflows that execute more than one step, choose an activity that can do so. For example, the `Sequence` activity lets us add multiple activities to execute in sequence (plumbing code left out for brevity): | ||
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| ```csharp | ||
| // Create a workflow. | ||
| var workflow = new Sequence | ||
| { | ||
| Activities = | ||
| { | ||
| new WriteLine("Hello World!"), | ||
| new WriteLine("Goodbye cruel world...") | ||
| } | ||
| }; | ||
| ``` | ||
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| Outputs: | ||
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| ```shell | ||
| Hello World! | ||
| Goodbye cruel world... | ||
| ``` | ||
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| ### Conditions | ||
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| The following demonstrates a workflow where it asks the user to enter their age, and based on this, offers a beer or a soda: | ||
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| ```csharp | ||
| // Declare a workflow variable for use in the workflow. | ||
| var ageVariable = new Variable<string>(); | ||
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| // Declare a workflow. | ||
| var workflow = new Sequence | ||
| { | ||
| // Register the variable. | ||
| Variables = { ageVariable }, | ||
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| // Setup the sequence of activities to run. | ||
| Activities = | ||
| { | ||
| new WriteLine("Please tell me your age:"), | ||
| new ReadLine(ageVariable), // Stores user input into the provided variable., | ||
| new If | ||
| { | ||
| // If aged 18 or up, beer is provided, soda otherwise. | ||
| Condition = new Input<bool>(context => ageVariable.Get<int>(context) < 18), | ||
| Then = new WriteLine("Enjoy your soda!"), | ||
| Else = new WriteLine("Enjoy your beer!") | ||
| }, | ||
| new WriteLine("Come again!") | ||
| } | ||
| }; | ||
| ``` | ||
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| Notice that: | ||
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| - To capture activity output, a workflow variable (ageVariable) is used. | ||
| - Depending on the result of the condition of the `If` activity, either the `Then` or the `Else` activity is executed. | ||
| - After the If activity completes, the final WriteLine activity is executed. | ||
|
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| ## ASP.NET Examples |
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src/bundles/Elsa.WorkflowServer.Web/Elsa.WorkflowServer.Web.csproj
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