数据

在步骤之间传递数据

每个步骤都是一个黑盒，因此它们支持输入和输出。这些输入和输出可以映射到定义与每个工作流实例相关的自定义数据的数据类。

下面的示例展示了如何在一个步骤上定义输入和输出，然后展示了如何使用内部数据的类型化类定义工作流，以及如何将输入和输出映射到自定义数据类的属性。

//Our workflow step with inputs and outputs
public class AddNumbers : StepBody
{
    public int Input1 { get; set; }

    public int Input2 { get; set; }

    public int Output { get; set; }

    public override ExecutionResult Run(IStepExecutionContext context)
    {
        Output = (Input1 + Input2);
        return ExecutionResult.Next();
    }
}

//Our class to define the internal data of our workflow
public class MyDataClass
{
    public int Value1 { get; set; }
    public int Value2 { get; set; }
    public int Value3 { get; set; }
}

//Our workflow definition with strongly typed internal data and mapped inputs & outputs
public class PassingDataWorkflow : IWorkflow<MyDataClass>
{  
    public void Build(IWorkflowBuilder<MyDataClass> builder)
    {
        builder            
            .StartWith<AddNumbers>()
                .Input(step => step.Input1, data => data.Value1)
                .Input(step => step.Input2, data => data.Value2)
                .Output(data => data.Value3, step => step.Output)
            .Then<CustomMessage>()
                .Input(step => step.Message, data => "The answer is " + data.Value3.ToString());
    }
    ...
}