Question

I’m trying to evaluate the value of a constant expression. In the debugger I can see the value:

but how do I get at it in code?

The expression is of the form:

x => x.ListPropery[5].ChildProperty

I’m walking down the expression to convert it into a string, but I’ve got stuck at the indexer part.

The indexer creates a MethodCallExpression on IList<> to get_Item, I can then work my way into the arguments to get at a constant expression which was generated like this:

for(var i = 0; i < list.Count; i++)
{
    var j = i;
    Expression<Func<IList<TValue>, TValue>> indexer = xs => xs[j];

Update:

(exp.Arguments[0] as MemberExpression).Member

returns a MemberInfo

Answer 1

aha!

(exp.Arguments[0] as MemberExpression).Member is a FieldInfo

so I can do:

((exp.Arguments[0] as MemberExpression).Member as FieldInfo).GetValue(((exp.Arguments[0] as MemberExpression).Expression as ConstantExpression).Value)