C# n从源数组中提取随机值： string[] addetailsID = new string[20]; // this is the array I want to index into // generate the 4 unique indices into addetailsID Random random = new Random(); List<int> indices = new List<int>(); while (indices.Count < 4) { int index = random.Next(0, addetailsID.Length); if (indices.Count == 0 || !indices.Contains(index)) { indices.Add(index); } } // now get the 4 random values of interest string[] strAdDetailsID = new string[4]; for (int i = 0; i < indices.Count; i++) { int randomIndex = indices[i]; strAdDetailsID[i] = addetailsID[randomIndex]; } string[]addetailsID=新字符串[20]；//这是我要索引到的数组 //将4个唯一索引生成addetailsID 随机=新随机（）； 列表索引=新列表（）； 而（指数计数

首先需要生成4个唯一索引，然后从源数组中提取随机值：

        string[] addetailsID = new string[20];  // this is the array I want to index into
        // generate the 4 unique indices into addetailsID
        Random random = new Random();
        List<int> indices = new List<int>();
        while (indices.Count < 4)
        {
            int index = random.Next(0, addetailsID.Length);
            if (indices.Count == 0 || !indices.Contains(index))
            {
                indices.Add(index);
            }
        }
        // now get the 4 random values of interest
        string[] strAdDetailsID = new string[4];
        for (int i = 0; i < indices.Count; i++)
        {
            int randomIndex = indices[i];
            strAdDetailsID[i] = addetailsID[randomIndex];
        }

string[]addetailsID=新字符串[20]；//这是我要索引到的数组
//将4个唯一索引生成addetailsID
随机=新随机（）；
列表索引=新列表（）；
而（指数计数<4）
{
int index=random.Next（0，addtailsid.Length）；
如果（index.Count==0 | |！index.Contains（index））
{
索引。添加（索引）；
}
}
//现在获取感兴趣的4个随机值
string[]strAdDetailsID=新字符串[4]；
对于（int i=0；i

查找洗牌技术（搜索Knuth、Fisher-Yates）。洗牌整个数组，然后按顺序选择四个。要获得唯一值，我认为您需要存储到目前为止获得的

索引的列表，并使用它检查以前是否使用过新索引查找洗牌技术（搜索Knuth，Fisher-Yates）。洗牌整个数组，然后按顺序选择四个。要获得唯一值，我认为您需要存储到目前为止获得的
索引列表，并使用它检查以前是否使用过新索引。。。错过了C#2.0的限制。这里的代码不起作用，但概念会起作用。哦。。。错过了C#2.0的限制。这里的代码不起作用，但概念会起作用。
result = []
For i = 0 to numItemsRequired:
    randomIndex = random number between i and source.length - 1
    result.add(source[randomIndex])
    swap(source[randomIndex], source[i])

string[] strAdDetailsID = new string[4];
Random rand = new Random();

for (int i = 0; i < 4; i++)
{
    int randIndex = rand.Next(i, adDetailsID.Length);
    strAddDetails[i] = adDetailsID[randIndex];

    string temp = adDetailsID[randIndex];
    adDetailsID[randIndex] = adDetailsID[i];
    adDetails[i] = temp;
}

 List<string> addetailsID = new List<string>{"1","2","3","4","5","6"};

 string[] strAdDetailsID = new string[4];
 Random random = new Random();
 for (int i = 0; i < 4; i++)
 {

     int index = random.Next(0, addetailsID.Count);
     string value = addetailsID[index].ToString();
     addetailsID.RemoveAt(index);
     strAdDetailsID[i] = value;
 }

  strAdDetailsID.Dump();

List<string> list = new List<string>() { "There", "Are", "Many", "Elements", "To", "Arrays" };

foreach (var item in list.OrderBy(f => Guid.NewGuid()).Distinct().Take(4))
{
    Console.WriteLine(item);
}

        string[] addetailsID = new string[20];  // this is the array I want to index into
        // generate the 4 unique indices into addetailsID
        Random random = new Random();
        List<int> indices = new List<int>();
        while (indices.Count < 4)
        {
            int index = random.Next(0, addetailsID.Length);
            if (indices.Count == 0 || !indices.Contains(index))
            {
                indices.Add(index);
            }
        }
        // now get the 4 random values of interest
        string[] strAdDetailsID = new string[4];
        for (int i = 0; i < indices.Count; i++)
        {
            int randomIndex = indices[i];
            strAdDetailsID[i] = addetailsID[randomIndex];
        }