ValidTypesAttribute Class

SystemObject
  SystemAttribute
    Tekla.Structural.ExpressoAddInValidTypesAttribute

public sealed class ValidTypesAttribute : Attribute

Public NotInheritable Class ValidTypesAttribute
	Inherits Attribute

public ref class ValidTypesAttribute sealed : public Attribute

[<SealedAttribute>]
type ValidTypesAttribute =  
    class
        inherit Attribute
    end

It is common within the .Net framework to have index properties that use different data types for keys. For example a value in a collection can be accessed by index or name (int or string). The ValidTypes Attribute allows a single Add-In method to accept multiple data types (by declaring the parameter as an object or dynamic type) and then inform Tedds how to pass the argument to that method. In the name/index example, valid types of int and string would be specified in the attribute. Tedds would then pass string variables to the method as a string but cast numeric variables from double to int before calling the method.