SDK: Flow Steps (Basic)

Overview

Developers can easily create custom Flow and Rule steps by methods in a Class Library (.NET Core) project. This article will show users how to accomplish this. For more examples 

Basic Flow Step

The below code example will create a Flow step that checks if a string is 5 digits long. For more examples, check the Public GitHub Repository for Decisions.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using DecisionsFramework.Design.Flow;

namespace ShippingExtensions
{
    [AutoRegisterMethodsOnClass(true, "SDK/ZipCode")]
    public class ZipCodeManagement
    {
        public bool IsZipCodeValid(string zipCode) {
            if (zipCode.Length ==5) {
                foreach (char eachChar in zipCode.ToCharArray()) {
                    if (Char.IsDigit(eachChar) == false) {
                        return false;
                    }
                }
                return true;
            }
            return false;
        }
    }
}

Using the Method in Decisions

After writing the method to build the project, add it to Decisions by following the steps in Software Development Kit (SDK) Overview.

1. Create a new Flow.
2.  In the Steps panel, navigate to SDK > ZipCode. 
   
3. Drag and drop the custom Is Zip Code Valid step onto the workspace. 
4. This step displays as a Rule step with a True and False outcome as stated in the method written. The step also has the Zip Code input that is expecting a string. 
5. Click Unknown and select Constant as the mapping type, and type in a 5-digit zip code.
   
6. Click Save to save changes to the Flow.

Debug

1. Click Debug on the top action bar. In the debugger, the Flow runs using "23322" as the input for the Rule step, and the step outputs as True.