【C#】根據開始時間和結束時間篩選存在的資訊
阿新 • • 發佈：2020-07-18
## 背景
業務需求中，需要根絕開始時間和結束時間篩選一段時間內的任務存在個數。
## 示例圖片
### 根據開始時間 9：00到 結束時間11：00 篩選資訊
總共有這麼四種情況可能出現
## 插入測試資料
```
CREATE TABLE [dbo].[Schedule] (
[ScheduleId] int NOT NULL IDENTITY(1,1) ,
[ScheduleTheme] nvarchar(100) NOT NULL ,
[ScheduleContent] nvarchar(500) NULL ,
[ScheduleBeginTime] datetime NULL ,
[ScheduleEndTime] datetime NULL ,
[CreateTime] datetime NULL
)
INSERT INTO [Demo].[dbo].[Schedule] ( [ScheduleTheme], [ScheduleContent], [ScheduleBeginTime], [ScheduleEndTime], [CreateTime] ) VALUES ('測試標題001', '', '2020-07-04 10:00:00', '2020-07-08 11:00:00', GETDATE());
INSERT INTO [Demo].[dbo].[Schedule] ( [ScheduleTheme], [ScheduleContent], [ScheduleBeginTime], [ScheduleEndTime], [CreateTime] ) VALUES ('測試標題001', '', '2020-07-06 10:00:00', '2020-07-09 11:00:00', GETDATE());
INSERT INTO [Demo].[dbo].[Schedule] ( [ScheduleTheme], [ScheduleContent], [ScheduleBeginTime], [ScheduleEndTime], [CreateTime] ) VALUES ('測試標題001', '', '2020-07-04 10:00:00', '2020-07-06 11:00:00', GETDATE());
INSERT INTO [Demo].[dbo].[Schedule] ( [ScheduleTheme], [ScheduleContent], [ScheduleBeginTime], [ScheduleEndTime], [CreateTime] ) VALUES ('測試標題001', '', '2020-07-06 10:00:00', '2020-07-06 11:00:00', GETDATE());
INSERT INTO [Demo].[dbo].[Schedule] ( [ScheduleTheme], [ScheduleContent], [ScheduleBeginTime], [ScheduleEndTime], [CreateTime] ) VALUES ('測試標題001', '', '2020-07-01 10:00:00', '2020-07-04 11:00:00', GETDATE());
INSERT INTO [Demo].[dbo].[Schedule] ( [ScheduleTheme], [ScheduleContent], [ScheduleBeginTime], [ScheduleEndTime], [CreateTime] ) VALUES ('測試標題001', '', '2020-07-08 10:00:00', '2020-07-14 11:00:00', GETDATE());
```
## 示例LINQ 程式碼
```
var beginDate=new DateTime(“2020-07-07”);
var endDate=new DateTime(“2020-07-07”);
var tasks = demo.Where(n =>
(n.ScheduleBeginTime > endDate && n.ScheduleBeginTime > beginDate)||
(n.ScheduleBeginTime > beginDate && n.ScheduleEndTime < endDate) ||
(n.ScheduleEndTime < endDate && n.ScheduleEndTime > beginDate) ||
(n.ScheduleEndTime > endDate && n.ScheduleBeginTime < beginDate);
```
## sql 示例
```
SELECT * FROM Schedule WHERE 1!=1
or (ScheduleBeginTime < '2020-07-07' AND ScheduleBeginTime > '2020-07-05') --查詢1種情況
or (ScheduleBeginTime > '2020-07-05' AND ScheduleEndTime < '2020-07-07' ) --查詢2種情況
or (ScheduleEndTime < '2020-07-07' AND ScheduleEndTime > '2020-07-05') --查詢3種情況
or (ScheduleEndTime > '2020-07-07' AND ScheduleBeginTime < '2020-07-05') --查詢4種情