Blog automapper extensions

Blog_automapperexttesions_5.cs

public static class FunctionCompositionExtensions
{
    public static Expression<Func<TX, TY>> Compose<TX, TY, TZ>(this Expression<Func<TZ, TY>> outer, Expression<Func<TX, TZ>> inner)
    {
        return Expression.Lambda<Func<TX, TY>>(
            ParameterReplacer.Replace(outer.Body, outer.Parameters[0], inner.Body),
            inner.Parameters[0]);
    }
}