/// <summary>
/// 从给定的题目句柄创建 ContestDataProvider 类的新实例。
/// </summary>
/// <param name="handle">比赛句柄。</param>
/// <param name="isReadonly">一个值，该值指示当前对象是否为只读对象。</param>
/// <returns>从给定的题目句柄创建的 ContestDataProvider 对象。</returns>
/// <exception cref="ArgumentNullException"/>
/// <exception cref="ContestNotFoundException"/>
public static ContestDataProvider Create(ContestHandle handle, bool isReadonly)
{
if (handle == null)
{
throw new ArgumentNullException(nameof(handle));
}
ContestDataContext context = new ContestDataContextFactory().CreateContext();
ContestEntity entity = context.QueryContestById(handle.ContestId);
if (entity == null)
{
context.Dispose();
throw new ContestNotFoundException(handle);
}
return(new ContestDataProvider(context, entity, isReadonly));
}
/// <summary>
/// 创建 ContestManager 类的新实例。
/// </summary>
private ContestManager()
{
m_factory = new ContestDataContextFactory();
}
