- 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).
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):
```csharp
// Create a workflow.
var workflow = new Sequence
{
Activities =
{
new WriteLine("Hello World!"),
new WriteLine("Goodbye cruel world...")
}
};
```
Outputs:
```shell
Hello World!
Goodbye cruel world...
```
### Conditions
The following demonstrates a workflow where it asks the user to enter their age, and based on this, offers a beer or a soda:
```csharp
// Declare a workflow variable for use in the workflow.
var ageVariable = new Variable<string>();
// Declare a workflow.
var workflow = new Sequence
{
// Register the variable.
Variables = { ageVariable },
// 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!")
}
};
```
Notice that:
- 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.
