求解，用Dictionary保存两个子类数据绑定到dataGridView报错

Car one = new Car("红色", 200, "ro20010", "奥迪A6", 3, null, 200);
Car two = new Car("黄色", 120, "pw220102", "大Q吧", 5, null, 20);
Truck ones = new Truck("蓝色", 300, "qq121314", "雷诺", 10, null, 300);
vehicle = new Dictionary<string, Vehicle>();
vehicle.Add(one.LicenseNO, one);
vehicle.Add(two.LicenseNO, two);
vehicle.Add(ones.LicenseNO, ones);
BindingSource bs = new BindingSource();
bs.DataSource = vehicle.Values;
this.dataGridView1.DataSource = bs;
值“CarLetSystem.Truck”不是“CarLetSystem.Car”类型，不能在此泛型集合中使用。
参数名: value