Beachwalker Beachwalker - 9 months ago 123
C# Question

How to set nested property value using FastMember

I get an exception when I try to set a nested member Property using FastMember. For example when having these classes

public class A
public B First { get; set; }

public class B
public string Second { get; set; }

and I want to set
of an instance to

var b = new B{ Second = "some value here" };
var a = new A{ First = b };
var accessor = ObjectAccessor.Create(a);
accessor["First.Second"] = value; // this does not work and gives ArgumentOutOfRangeException

I can't split it up into ["First"]["Second"] because I don't know the depth at this point. Is there a magical access for nested properties or do I have to split the hierarchy myself?

Answer Source

You need to traverse the object graph using multiple ObjectAccessor instances.

public static void UseFastMember()
    var b = new B { Second = "some value here" };
    var a = new A { First = b };
    var value = "hello";
    var a_accessor = ObjectAccessor.Create(a);
    var first = a_accessor["First"];
    var b_accessor = ObjectAccessor.Create(first);
    b_accessor["Second"] = value;