/// <summary>
/// Returns an expression representing the addition of a target result to the cache.
/// </summary>
/// <param name="source"></param>
/// <param name="target"></param>
/// <param name="targetType"></param>
/// <returns></returns>
private static Expression AddToCache(Expression source, Expression target)
{
//return Expression.Call(
// Expression.Field(null, Meta.Field(() => MapperCache.Cache)),
// Meta<Dictionary<Tuple<object, Type>, object>>.Method(x => x.Add(default(Tuple<object, Type>), null)),
// Expression.Call(
// null,
// Meta.Method(() => Tuple.Create<object, Type>(null, default(Type))),
// source.Convert(typeof(object)),
// Expression.Constant(target.Type)
// ),
// target.Convert(typeof(object))
// );
return(Expression.Call(
Meta.Method(() => DictionaryExtension.TryAdd <Tuple <object, Type>, object>(null, null, null)),
Expression.Field(null, Meta.Field(() => MapperCache.Cache)),
Expression.Call(
null,
Meta.Method(() => Tuple.Create <object, Type>(null, default(Type))),
source.Convert(typeof(object)),
Expression.Constant(target.Type)
),
target.Convert(typeof(object))
));
}