小编And*_*gin的帖子

我有一个实体列表，其中的一个字段（UtcOffset）是一个数字。

我有一个过滤器列表offsets，它是数字列表。

我想用LINQ从第一个列表中选择UtcOffset字段等于或小于过滤器列表中delta添加固定值（3600）的值的所有实体。

我有一个仅适用于“相等大小写”的代码

public class TimeZone
{
    public int Id { get; set; }
    public string Name { get; set; }
    public int UtcOffset { get; set; }
}


var delta = 3600;

List<TimeZone> TimeZones = new List<TimeZone>()
{
    new TimeZone() {Id = 1, Name = "America/Tortola", UtcOffset = -14400},
    new TimeZone() {Id = 2, Name = "Asia/Kathmandu", UtcOffset = 20700},
    new TimeZone() {Id = 3, Name = "Asia/Kolkata", UtcOffset = …

我有一个查询（最后一列）之一，应该是减去其他两列的结果。我的问题是，如果操作数之一为零，那么结果我也为零。这是样品

SELECT 
#TmpDates.Date As Registration, 
ISNULL(Cr.NewSubscriptionsCount,0) As 'Initial Size',
ISNULL(U.UnsubsCount, 0) As 'Unsub. Count',
ISNULL(Cr.NewSubscriptionsCount - U.UnsubsCount, 0) As 'Alive count',
ISNULL(Cl.ClicksCount, 0) As Clicks,
CAST(ISNULL(C.Cost, 0) AS MONEY) As Cost,
CAST(ISNULL(P.Profit, 0) AS MONEY) As Revenue,
CAST(ISNULL((P.Profit - C.Cost), 0) AS MONEY) As Profit

FROM 

    #TmpDates 
    LEFT JOIN #TmpUnsubs U ON #TmpDates.Date = U.CreationDate   
    LEFT JOIN #TmpCreated Cr ON #TmpDates.Date = Cr.CreationDate
    LEFT JOIN #TmpClicks Cl ON #TmpDates.Date = Cl.SubscriptionCreationDate
    LEFT JOIN #TmpCost C ON #TmpDates.Date = C.CreationDate
    LEFT …