目前我正在使用以下查询来计算用户活动统计信息，例如用户登录，退出等多少次......其工作正常。但是我想通过仅创建一次UserActivityStatistics对象并希望避免重复代码来改进我的代码。创建对象两次，如下所示。
private IList<UserActivityStatistics> ToUserActivityStatistics(DateTime fromDate, DateTime toDate, int pageIndex, int pageSize, Guid userId, ActivityType activity)
{
IList<UserActivityStatistics> userActivityStatistics = null;
if (userId == null || userId == Guid.Empty)
{
userActivityStatistics = (from u in SqlGetUserActivityStatistics(fromDate, toDate, userId, activity)
group u by new { u.Activity, u.UserId } into g
select g).AsEnumerable().Select(x => new UserActivityStatistics
{
Activity = Activity.GetActivityTypeName((ActivityType)x.Key.Activity),
ActivityCount = x.Count(),
UserId = x.Key.UserId,
UserName = x.Select(y => y.aspnet_Users.UserProfiles.FirstName + " " + y.aspnet_Users.UserProfiles.LastName).FirstOrDefault()
}).OrderByDescending(y => y.ActivityCount).Skip(pageIndex).Take(pageSize).ToList();
}
else
{
userActivityStatistics = (from u in SqlGetUserActivityStatistics(fromDate, toDate, userId, activity)
group u by u.Activity into g
select g).AsEnumerable().Select(x => new UserActivityStatistics
{
Activity = Activity.GetActivityTypeName((ActivityType)x.Key),
ActivityCount = x.Count(),
UserId = x.Select(y => y.aspnet_Users.UserProfiles.UserId).FirstOrDefault(),
UserName = x.Select(y => y.aspnet_Users.UserProfiles.FirstName + " " + y.aspnet_Users.UserProfiles.LastName).FirstOrDefault()
}).OrderByDescending(z => z.ActivityCount).Skip(pageIndex).Take(pageSize).ToList();
}
return userActivityStatistics;
}
我正在改进我的代码，如下所示，因为我将UserActivityStatistics对象移到外面，并将其分组为可查询的。但是我无法从该iqueryable对象计算计数。我在网上搜索，但我没有得到任何解决方案。
希望清楚......
private IList<UserActivityStatistics> ToUserActivityStatistics(DateTime fromDate, DateTime toDate, int pageIndex, int pageSize, Guid userId, ActivityType activity)
{
IList<UserActivityStatistics> userActivityStatistics = null;
IQueryable<ActivityLog> activityLog = null;
if (userId == null || userId == Guid.Empty)
{
activityLog = (from u in SqlGetUserActivityStatistics(fromDate, toDate, userId, activity)
select u).GroupBy(x => new { x.Activity, x.UserId }).SelectMany(x => x);
}
else
{
activityLog = (from u in SqlGetUserActivityStatistics(fromDate, toDate, userId, activity)
select u).GroupBy(x => new { x.Activity}).SelectMany(x => x);
}
userActivityStatistics = (from u in activityLog
select u).AsEnumerable().Select(x => new UserActivityStatistics
{
Activity = Activity.GetActivityTypeName((ActivityType)x.Activity),
ActivityCount = //unable to do count
UserId = x.UserId
}).OrderByDescending(x => x.ActivityCount).Skip(pageIndex).Take(pageSize).ToList();
return userActivityStatistics;
}