C# 对数组、列表随机排序的实现方法 – 珊瑚贝

在 C# 中，如果要从一个数组中随机取出一条数据，可以使用以下代码：

Random rnd = new Random();
string[] malePetNames = { "Rufus", "Bear", "Dakota", "Fido",
                          "Vanya", "Samuel", "Koani", "Volodya",
                          "Prince", "Yiska" };
string[] femalePetNames = { "Maggie", "Penny", "Saya", "Princess",
                            "Abby", "Laila", "Sadie", "Olivia",
                            "Starlight", "Talla" };

// Generate random indexes for pet names.
int mIndex = rnd.Next(malePetNames.Length);
int fIndex = rnd.Next(femalePetNames.Length);

// Display the result.
Console.WriteLine("Suggested pet name of the day: ");
Console.WriteLine("   For a male:     {0}", malePetNames[mIndex]);
Console.WriteLine("   For a female:   {0}", femalePetNames[fIndex]);

// The example displays output similar to the following:
//       Suggested pet name of the day:
//          For a male:     Koani
//          For a female:   Maggie

如果想要对数组或列表的内容进行随机排序，可以使用以下代码：

public static void Shuffle<T>(Random rnd, T[] array)
{
	int n = array.Length;
	while (n > 1)
	{
		int k = rnd.Next(n--);
		T temp = array[n];
		array[n] = array[k];
		array[k] = temp;
	}
}

public static void Shuffle<T>(Random rnd, IList<T> array)
{
	int n = array.Count;
	while (n > 1)
	{
		int k = rnd.Next(n--);
		T temp = array[n];
		array[n] = array[k];
		array[k] = temp;
	}
}

调用：

var arr = new int[] { 1,2,3,4,5,6 };
var rnd = new Random();
Shuffle(rnd, arr);
Console.WriteLine(string.Join(", ", arr));