Check List lenght in rdlc report

Question

I'm passing a dataset to a report using an object data source. The data source contains object of a custom class. This class have a list of nested object.

I need to output the value of 3 of these objects or String.Empty. So if the list contains 'A' and 'B', the report should output 'A', 'B' and ''.

I print the value of the object in the list like so:

=Fields!MyList.Value(0).ObjectPropertyToPrint

However, if the list doesn't contains 3 items, I have #Error.

I've tried this way

=iif(Fields!MyList.Value.Length >= 2,Fields!MyList.Value(2).ObjectPropertyToPrint,"")

and

=iif(Fields!MyList.Value.GetUpperBound(0) >= 2,Fields!MyList.Value(2).ObjectPropertyToPrint,"")

But both results in #Error

I also tried to output only

=Fields!MyList.Value.Length
=Fields!MyList.Value.GetUpperBound(0)

But both printed #Error

This is the C# List object I'm using. It's only a workaroung to pass nested object to rdlc

[Serializable]
public class MyObjectList : List<MyObject>
{
    public MyObjectList () { }
}

Answer 1

I've resolved my issue using the following line:

=if(Fields!MyLisValue.Count() >= 2,Fields!BolProducts.Value(1).ObjectPropertyToPrint,"")

Notice the use of if instead of iif. Since iif is a function, all argument are evaluated . This cause an index out of range and crash.