private static IQueryable <ContestEntity> DoQuery(ContestDataContext context, ContestQueryParameter query)
{
IQueryable <ContestEntity> set = context.QueryAllContests();
if (query.QueryByTitle)
{
set = ContestDataContext.QueryContestsByTitle(set, query.Title);
}
if (query.QueryByCreator)
{
set = ContestDataContext.QueryContestsByCreator(set, query.Creator);
}
if (query.QueryByStatus)
{
switch (query.Status)
{
case ContestStatus.Pending:
set = ContestDataContext.QueryUnstartedContests(set);
break;
case ContestStatus.Running:
set = ContestDataContext.QueryRunningContests(set);
break;
case ContestStatus.Ended:
set = ContestDataContext.QueryEndedContests(set);
break;
default:
throw new ArgumentException(nameof(query.Status));
}
}
return(set);
}
/// <summary>
/// 使用给定的比赛实体对象创建 ContestDataProvider 类的新实例。
/// </summary>
/// <param name="context">数据上下文对象。</param>
/// <param name="entity">比赛实体对象。</param>
/// <param name="access">比赛数据底层访问对象。</param>
/// <param name="isReadonly">一个值，该值指示当前对象是否为只读对象。</param>
/// <exception cref="ArgumentNullException"/>
private ContestDataProvider(ContestDataContext context, ContestEntity entity, bool isReadonly)
{
m_context = context ?? throw new ArgumentNullException(nameof(context));
m_entity = entity ?? throw new ArgumentNullException(nameof(entity));
m_access = new ContestAccessHandle(entity);
m_readonly = isReadonly;
m_disposed = false;
}