/// <summary>
/// 随机获取指定类型的题目num条
/// </summary>
/// <param name="questionsType"></param>
/// <param name="num"></param>
/// <returns></returns>
public async Task <List <Questions> > GetList(QuestionsTypeEnum questionsType, int num)
{
try
{
List <int> idList = new List <int>();
DataContext dataContext = new DataContext();
var list = await dataContext.QuestionsDbSet.Where(x => x.QuestionsType == questionsType).Select(x => x.Id).ToListAsync();
if (list != null)
{
for (int i = 0; i < num; i++)
{
int times = num;
A:
Random random = new Random();
var rindex = random.Next(0, list.Count - 1);
var id = list[rindex];
if (idList.Contains(id))
{
if (times > 0)
{
times--;
goto A;
}
}
else
{
idList.Add(id);
}
}
var qlist = await dataContext.QuestionsDbSet.Where(x => idList.Contains(x.Id)).ToListAsync();
return(qlist);
}
}
catch (Exception e)
{
ClassLoger.Error("QuestionsDal.GetList", e);
}
return(null);
}
/// <summary>
/// 随机获取指定类型的题目num条
/// </summary>
/// <param name="questionsType"></param>
/// <param name="num"></param>
/// <returns></returns>
public async Task <List <Questions> > GetList(QuestionsTypeEnum questionsType, int num)
{
return(await QuestionsDal.Ins.GetList(questionsType, num));
}
