Epicor Function Custom Code: C# Signature, Parameters and Calling It

Write and use a function with custom code

1. 1Open Epicor Function Maintenance and create a library if one does not exist, then a new function inside it with an ID and description.
2. 2Define the request parameters (inputs) and response parameters (outputs) with names and types.
3. 3Open the designer and add a custom code block, or switch to the code view, and write the C# using the parameter names as variables.
4. 4Declare any services (for example the Dynamic Query service) or required libraries the code uses.
5. 5Set the function to the right access level and check it compiles using the Validate or Compile action.
6. 6Use the test area to run the function with sample inputs and inspect outputs and errors.
7. 7Call the function from a BPM (a Call Epicor Function widget), from an Application Studio event (a function call action), from another function, or from the REST API.

Reading data and handling errors

if (qty <= 0)

    throw new Ice.BLException("Quantity must be greater than zero.");

Common pitfalls

• !Changing request or response parameter names after callers exist.
• !Doing heavy data work in functions called from synchronous BPM directives.
• !Swallowing exceptions, so failures are invisible to users.
• !Not testing with a restricted user, since production security differs from the developer account.