//在min到max之间获取count个不重复随机值
private List<int> getRandomNum(int min, int max,int count)
{
List<int> randoms = new List<int>();
if (min > 0 && max >= min && count > 0)
{
if (max - min <= count)
{
for (int i = min; i <= max; i++)
randoms.Add(i);
}
else
{
int limitIdx = max - min;
List<int> arrs = Enumerable.Range(min, limitIdx + 1).ToList<int>();
for (int i = 0; i < count; i++)
{
int idx = GetNextRandomNum(0, limitIdx, true);
var tmp = arrs[idx];
randoms.Add(tmp);
arrs[idx] = arrs[limitIdx];
arrs[limitIdx] = tmp;
limitIdx--;
}
}
}
return randoms;
}
//在min到max之间获取count个不重复随机值,并将不足的数量加到余量中
private List<int> getRandomNum(int min, int max, int count, ref int extraCount)
{
List<int> randoms = getRandomNum(min, max, count);
extraCount += count - randoms.Count;
return randoms;
}
static System.Random rdInt;
private int GetNextRandomNum(int min, int max, bool upBound = false)
{
if(rdInt == null)
{
rdInt = new System.Random((int)DateTime.Now.ToFileTimeUtc());
}
if(upBound)
{
max = max + 1;
}
int ret = rdInt.Next(min, max);
return ret;
}