A question about mapping expressions

[dahari87]

Hi,
i have the following method:
public string GetQuery(params Expression<Func<MyClass, object>>[] properties){}
so i able to use it this way:
GetQuery(x => x.FirstName, x => x.NestedProp.NestedValue);

how can i map the properties array to a valid IQuery?
tried the following:

foreach (var property in properties)
    {
        if (property.Body is MemberExpression)
        {
           // this works for MemberExpressions only
            query.AddField(property);
        }
        else
        {
          // here i have to handle nested expressions "x.NestedProp.NestedValue"
          // i'm not sure how to map the UnaryExpression to the query
        }
    }

can someone please give me a hint?
thanks in advanced