C# 洗牌顺序打乱算法，并且第一个元素不能一样
public class ConditionalShuffler{private readonly Random _random = new Random();public List<string> ShuffleWithCondition(List<string> originalList){// 基础校验if (originalList == null || originalList.Count < 2)throw new ArgumentException("集合必须包含至少两个元素");string originalFirst = originalList[0];// 创建候选元素集合List<string> candidates = originalList.Where(x => x != originalFirst).ToList();// 异常情况处理if (candidates.Count == 0){return originalList;//throw new InvalidOperationException("所有元素都与首元素相同");}else{// 选择新首元素string newFirst = candidates[_random.Next(candidates.Count)];// 构建剩余元素集合List<string> remaining = new List<string>(originalList);remaining.Remove(newFirst); // 移除第一个匹配项// 打乱剩余元素Shuffle(remaining);// 构建最终结果return new List<string> { newFirst }.Concat(remaining).ToList();}}private void Shuffle(List<string> list){for (int i = list.Count - 1; i > 0; i--){int j = _random.Next(i + 1);(list[i], list[j]) = (list[j], list[i]);}}}
