C# dynamically set property using lambda? [duplicate]

This question already has an answer here:

• Sum of items in a collection 1 answer

I have a tree constructed using a TreeNode class where each node has an Amounts object. The Amounts object is a simple class that houses some decimal values. E.g.

public class Amounts
{
    public decimal Amount1 { get; set; }
    public decimal Amount2 { get; set; }
    ...
}

I need to be able to performsum up the individual properties independently, and what I'd like to do is somehow pass one of the Amounts properties to this method using a lambda or similar but I can't quite work out how to do this (I've been a while off the tools unfortunately). I don't particularly like the idea of passing a property name string so I can use reflection SetPropertyValue method.

The traversal method looks something like this (a little contrived of course):

public void Traverse()
{
    foreach (var child in this.Children)
    {
        this.Amounts.Amount1 += child.Amounts.Amount1;
    }            
}

Rather than having a separate method for each amount, I'd like to do be able to call it something like below:

Traverse(a => a.Amount1);

I'm not sure if I have explained the requirement very well, but hopefully enough to get a pointer in the right direction.

Thanks, John