When trying to query the following:

var result = await graphClient.Cypher
	.Match($"(a:FunctionHolder {{Id: '{id.ToString().ToUpper()}'}})-[r:IS_{function.ToString().ToUpper()}_OF*..]->(b)")
	.With("a,b,r")
	.Return((a, r, b) => new
	{
		FunctionHolder = a.As<Models.FunctionHolder>(),
		FunctionHolderOf = b.As<Models.FunctionHolder>(),
		Relationship = r.As<List<Models.Relationship>>()
	})
	.ResultsAsync;

you may receive the following exception:

Method not found: 'System.Threading.Tasks.Task`1<System.Collections.Generic.List`1<Neo4j.Driver.IRecord>> Neo4j.Driver.ResultCursorExtensions.ToListAsync(Neo4j.Driver.IResultCursor)'.

This is due to the Relationship = r.As<List<Models.Relationship>>() part of the Return statement. The r you are returning isn't collected into a List<T> yet - it's still just a node. What you probably want to do instead would be:

var result = await graphClient.Cypher
    .Match($"(a: FunctionHolder {{ Id: '{ id.ToString().ToUpper()}'}})-[r: IS_{ function.ToString().ToUpper()}_OF*..]->(b)")
    .With("a, b, COLLECT(r) AS r")
    .Return((a, r, b) => new
    {
        FunctionHolder = a.As<Models.FunctionHolder>(),
        FunctionHolderOf = b.As<Models.FunctionHolder>(),
        Relationship = r.As<List<Models.Relationship>>()
    })
    .ResultsAsync;

In this code we have changed the .With statement to do the COLLECT. An alternative solution could be:

var result = await graphClient.Cypher
	.Match($"(a: FunctionHolder {{ Id: '{ id.ToString().ToUpper()}'}})-[r: IS_{ function.ToString().ToUpper()}_OF*..]->(b)")
	.Return((a, collect(r), b) => new
	{
		FunctionHolder = a.As<Models.FunctionHolder>(),
		FunctionHolderOf = b.As<Models.FunctionHolder>(),
		Relationship = r.CollectAs<List<Models.Relationship>>()
	})
	.ResultsAsync;