帶權重的隨機：

 /// <summary>
 /// 帶權重的隨機
 /// </summary>
 /// <param name="list">原始列表</param>
 /// <param name="count">隨機抽取條數</param>
 /// <returns></returns>
 public static List<T> GetRandomList<T>(List<T> list, int count) where T : RandomObject
 {
     if (list == null
 
 || list.Count <= count || count <= 0)
     {
         return list;
     }

     //計算權重總和
     int totalWeights = 0;
     for (int i = 0; i < list.Count; i++)
     {
         totalWeights += list[i].Weight + 1;  //權重+1，防止為0情況。
     }

     //隨機賦值權重
     System.Random ran = new System.Random(GetRandomSeed());  //GetRandomSeed()隨機種子，防止快速頻繁呼叫導致隨機一樣的問題 
 

     List<KeyValuePair<int, int>> wlist = new List<KeyValuePair<int, int>>();    //第一個int為list下標索引、第一個int為權重排序值
     for (int i = 0; i < list.Count; i++)
     {
         int w = (list[i].Weight + 1) + ran.Next(0, totalWeights);   // （權重+1） + 從0到（總權重-1）的隨機數
         wlist.Add(new
 
 KeyValuePair<int, int>(i, w));
     }

     //排序
     wlist.Sort(
       delegate (KeyValuePair<int, int> kvp1, KeyValuePair<int, int> kvp2)
       {
           return kvp2.Value - kvp1.Value;
       });

     //根據實際情況取排在最前面的幾個
     List<T> newList = new List<T>();
     for (int i = 0; i < count; i++)
     {
         T entiy = list[wlist[i].Key];
         newList.Add(entiy);
     }

     //隨機法則
     return newList;
 }
 /// <summary>
 /// 隨機種子值
 /// </summary>
 /// <returns></returns>
 private static int GetRandomSeed()
 {
     byte[] bytes = new byte[4];
     System.Security.Cryptography.RNGCryptoServiceProvider rng = new System.Security.Cryptography.RNGCryptoServiceProvider();
     rng.GetBytes(bytes);
     return BitConverter.ToInt32(bytes, 0);
 }

使用例子：

/// <summary>
/// 權重物件
/// </summary>
public class RandomObject
{
    /// <summary>
    /// 權重
    /// </summary>
    public int Weight { set; get; }
}
public class GameItemRandomObject : RandomObject
{
    public int item { get; set; }
}

List<GameItemRandomObject> shuidiRanObj = new List<GameItemRandomObject>();
shuidiRanObj.Add(new GameItemRandomObject() { item = 0, Weight = 15 });
shuidiRanObj.Add(new GameItemRandomObject() { item = 1, Weight = 10 });

CurItem = MyExtansion.GetRandomList<GameItemRandomObject>(shuidiRanObj, 1)[0].item;

不帶權重的隨機：

/// <summary>
/// 產生從0開始的隨機數
/// </summary>
/// <param name="sum">需要的隨機數的個數</param>
/// <param name="max">隨機的最大值，不會等於最大值</param>
/// <returns></returns>
public static int[] GetRandoms(int sum, int max)
{
    max++;
    if (max < 1)
    {
        LogTool.LogError("GetRandoms Error: max <= 1");
        return null;
    }
    int[] arr = new int[sum];
    int j = 0;
    //表示鍵和值對的集合。
    Hashtable hashtable = new Hashtable();
    System.Random rm = new System.Random();
    for (int i = 0; hashtable.Count < sum; i++)
    {
        //返回一個小於所指定最大值的非負隨機數
        int nValue = rm.Next(max);
        //containsValue(object value)   是否包含特定值
        if (!hashtable.ContainsValue(nValue) && nValue != 0)
        {
            //把鍵和值新增到hashtable
            hashtable.Add(nValue, nValue);
            //Debug.Log(i);
            arr[j] = nValue;

            j++;
        }
    }
    int temp;
    //最多做n-1趟排序
    for (int i = 0; i < arr.Length - 1; i++)
    {
        //對當前無序區間score[0......length-i-1]進行排序(j的範圍很關鍵，這個範圍是在逐步縮小的)
        for (j = 0; j < arr.Length - i - 1; j++)
        {
            if (arr[j] > arr[j + 1])
            {
                temp = arr[j];
                arr[j] = arr[j + 1];
                arr[j + 1] = temp;
            }
        }
    }

    for(int i =0;i< arr.Length; i++)
    {
        arr[i]--;
    }
    return arr;
}

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