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----  怎么判定上周有购买过电脑，代码要怎么写  (http://www.foxtable.com/bbs/dispbbs.asp?boardid=2&id=188157)
--  作者：F1216310
--  发布时间：2023/9/5 13:42:00
--  怎么判定上周有购买过电脑，代码要怎么写
产品 购买日期
电脑 8.29
电脑 8.30
电脑 9.5
--  作者：有点蓝
--  发布时间：2023/9/5 13:52:00
--  
参考：http://www.foxtable.com/webhelp/topics/2720.htm


Dim y As Integer = Date.Today.Year
Dim w As Integer = Date.Today.DayOfWeek \'算出今天是星期几
Dim dt1 As Date = Date.Today.AddDays( - w) \'获取本周的第一天
Dim dt2 As Date = Date.Today.AddDays(6 - w) \'获取本周的最后一天
Dim Filter As String
Filter = "购买日期 >= #" & dt1 & "# And 购买日期 <= #" & dt2 & "#"
msgbox("本周条件：" & Filter)

Dim Filter1 As String = "购买日期 >= #" & dt1.AddDays( - 7) & "# And 购买日期 <= #" & dt2.AddDays( - 7) & "#"
msgbox("上周条件：" & Filter1)
--  作者：listfor
--  发布时间：2023/9/5 14:53:00
--  
Imports System.Globalization

Public Sub CheckComputerPurchaseLastWeek()
    Dim purchaseRecords As List(Of Dictionary(Of String, Object)) = New List(Of Dictionary(Of String, Object))() From {
        New Dictionary(Of String, Object) From {{"product", "电脑"}, {"purchaseDate", New DateTime(2023, 8, 29)}, },
        New Dictionary(Of String, Object) From {{"product", "电脑"}, {"purchaseDate", New DateTime(2023, 8, 30)}, },
        New Dictionary(Of String, Object) From {{"product", "电脑"}, {"purchaseDate", New DateTime(2023, 9, 5)}, }
    }

    Dim currentDate As
					DateTime
					= DateTime.Now
    Dim lastWeekStart As
					DateTime
					= currentDate.AddDays(-7).Date.ToString("MM/dd/yyyy", CultureInfo.InvariantCulture)

    Dim hasPurchase As
					Boolean
					= False

    For Each record
					In purchaseRecords
        If record("purchaseDate").ToString("MM/dd/yyyy", CultureInfo.InvariantCulture) >= lastWeekStart Then

					hasPurchase
					= True
            Exit For
        End If
    Next

    If hasPurchase Then
        Console.WriteLine("上周有购买电脑")
    Else
        Console.WriteLine("上周没有购买电脑")
    End If
End Sub
 
--  作者：有点蓝
--  发布时间：2023/9/5 15:04:00
--  
如果是ChatGPT提问的代码，以后建议还是不要发上来了。