How to get and modify a property value through a custom Attribute?

Question

I want to create a custom attribute that can be used on a property like:

[TrimInputString]
public string FirstName { get; set; }

that will

Answer 1

This can be done with Dado.ComponentModel.Mutations.

public class User
{
    [Trim]
    public string FirstName { get; set; }
}

// Then to preform mutation
var user = new User() {
    FirstName = " David Glenn   "
}

new MutationContext(user).Mutate();

You can see more documentation here.