class class1
{
    public string Name { get; set; }
    public string Address { get; set; }

    public string this[string propertyname]
    {
        //当然更好的写法是反射
        get {
            if (propertyname == "name") return Name;
            if (propertyname == "address") return Address;
            return "";
        }
        set {
            if (propertyname == "name") Name = value;
            if (propertyname == "address") Address = value;
        }
    }
}