Question

在c＃中有一个对象列表。例如，具有属性“颜色”的“汽车”列表。现在我想随机订购所有属性为“绿色”的汽车。

Car c01 = new Car("green","HONDA");
Car c02 = new Car("blue","BMW");
Car c03 = new Car("green","NISSAN");
Car c04 = new Car("blue","VW");
Car c05 = new Car("red","MERCEDES");
Car c06 = new Car("green","BMW");

List<CarAcceleration> Cars = new List<CarAcceleration>();
Cars.Add (c01);
Cars.Add (c02);
Cars.Add (c03);
Cars.Add (c04);
Cars.Add (c05);
Cars.Add (c06);

我的想法是首先将所有绿色汽车写入第二个列表，重新排序，然后以某种方式覆盖第一个大列表中的元素。可能有更好的解决方案吗？感谢

很抱歉，如果这是误导性的：我仍然希望保持列表的其余部分正确。例如，这种安排将是一个解决方案：

Car c06 = new Car("green","BMW");
Car c02 = new Car("blue","BMW");
Car c01 = new Car("green","HONDA");
Car c04 = new Car("blue","VW");
Car c05 = new Car("red","MERCEDES");
Car c03 = new Car("green","NISSAN");

Answer 1

这有效：

var rnd = new Random();
var shuffledGreen =
    Cars
        .Where(c => c.Color == "green")
        .OrderBy(c => rnd.Next())
        .ToArray();

for (int i = 0, j = 0; i <= Cars.Count() - 1; i++)
{
    if (Cars[i].Color == "green")
    {
        Cars[i] = shuffledGreen[j++];
    }
}

对象列表中特定元素的随机顺序c＃

1 个答案: