Exposed Variable

[kaywai]

Hi,

In layman terms, could you please explain what is an ExposedVariable and occasions where it is required?

Regards
Kay Wai

[NinjaTrader_ChelseaB]

Hello Kay Wai,

An exposed variable is used to access information within the class of the strategy or indicator.

This uses the 'public' access modifier.

https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/access-modifiers

This is used when you want an input in the Indicators or Strategies window for the parameters of a script, or if you want to have an indicator that has a value you would like to call from a host script like a strategy.

[kaywai]

Thank you Chelsea. Still seems alien to me! I'll ask again if I further questions.

[jeronymite]

kaywai You can think of it as a variable in someone else's code that is visible to, and accessible/usable by, code you have written. It is "exposed" to "outside" code. A variable that is not exposed may still be visible using code viewing tools (or in the source, if available), but it will not be accessible or usable by code outside the dll (i.e. the assembly) it is part of. It is protected from "public" use.

So, as NinjaTrader_ChelseaB observes, "exposed" and "public" are both ways to describe this, but "public" also corresponds to the actual C# code (the access modifier) used to expose a variable. For example, the code public int x = 0; makes the variable x exposed and usable by outside code; whereas the code private int x = 0; protects the variable from any use other than within the original dll.

Hope that helps.

[kaywai]

Hi Jeronymite,

That makes sense!. Thank you for that. Appreciate it.

Regards
Kay Wai