Para extender la respuesta de @Kuroro, si necesita probar si la propiedad está vacía, a continuación debería funcionar.
public static bool PropertyExistsAndIsNotNull(dynamic obj, string name)
{
if (obj == null) return false;
if (obj is ExpandoObject)
{
if (((IDictionary<string, object>)obj).ContainsKey(name))
return ((IDictionary<string, object>)obj)[name] != null;
return false;
}
if (obj is IDictionary<string, object> dict1)
{
if (dict1.ContainsKey(name))
return dict1[name] != null;
return false;
}
if (obj is IDictionary<string, JToken> dict2)
{
if (dict2.ContainsKey(name))
return (dict2[name].Type != JTokenType.Null && dict2[name].Type != JTokenType.Undefined);
return false;
}
if (obj.GetType().GetProperty(name) != null)
return obj.GetType().GetProperty(name).GetValue(obj) != null;
return false;
}