Adding custom functions - NeilMacMullen/kusto-loco GitHub Wiki

See the CustomFunctions sample

Create a partial function annotated with KustoImplementation

// ReSharper disable PartialTypeWithSinglePart
[KustoImplementation(Keyword = "fizz")]
public partial class FizzFunction
{
}

Add a dependency to SourceGeneration

   <ProjectReference Include="..\SourceGeneration\SourceGeneration.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />

Add a nuget ref to Kusto Language

Add one or more "Impl" methods inside the Function class

   public static string Impl(long n)
   {
       var fizz = n % 3 == 0 ? "fizz" : string.Empty;
       var buzz = n % 5 == 0 ? "buzz" : string.Empty;
       return fizz + buzz;
   }

IMPORTANT method names must end "Impl". If more than overide is provided, a unique prefix for each method-name is required.

Null-checking for parameters is not required; the default behaviour for the source generator is to automatically return null/string.Empty if any parameter is null.