C#可以用公用静态类实现公用变量的跨form调用。一定注意dictionary是需要在类中实例化的，用new

public static class resultjson
    {
        public static string input;   //注意全局变量要使用static 
        public static string output;
        public static string body_part;
        public static string organ_list;

        public static string task_id;
        public static string status;

        public static int index_contour;

        public static Dictionary<string, int> num_slices = new Dictionary<string, int>();//need to new in the class
    }