Today, we will focus on another set of libraries available for BizTalk Server 2020: Custom Advanced Functoids. This is part of the migration task for the BizTalk Mapper Extensions UtilityPack project I’ve been working on over the last few days.
📝 One-Minute Brief
Introduces the Custom Advanced Functoids in the BizTalk Mapper Extensions UtilityPack for BizTalk Server 2020, providing advanced conditional mapping capabilities that simplify complex transformation logic inside BizTalk maps.
Custom Advanced Functoids
This library includes a suite of functoids that support conditional mapping directly inside the BizTalk mapper.
The library provides the following Custom Advanced Functoids.
Default Value Mapping Functoid: The Value Mapping and Value Mapping (Flattening) functoids perform conditional mappings between input and output messages. When the first input parameter evaluates to true, BizTalk writes the second input value to the target element or attribute. Otherwise, BizTalk does not create the target node.
In contrast, the Default Value Mapping functoid applies a slightly different rule. It returns one of two input values based on a null or empty check.
If the first input value is null or empty, the functoid returns the second input value. Otherwise, it returns the first value.
This functoid requires two mandatory input parameters:
- A string value to test for null or empty
- A string value that acts as the default value
Example output: P0011
BizTalk Mapper Extensions Utility Pack
BizTalk Mapper Extensions Utility Pack is a set of libraries that includes several useful functoids to include in a map, extending BizTalk Mapper’s capabilities.

Download
You can download the source code and application binaries from GitHub:
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Sandro,
It looks like the Math functiods project is not signed, and thus I could not install it. I did not see a key file for it in either the 2016 nor 2020 folder.
You don’t need to install them, you just need them in a development environment on the C:\Program Files (x86)\Microsoft BizTalk Server 2016\Developer Tools\Mapper Extensions folder