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• 将收集中的主要收集材料(主要收集的过滤版本)作为藏匿点。
原标题:Storing subcollections (filtered versions of the main collection) inside the collection as cache?

是否在母子收集的X项子收集中为母子收集的滤滤过滤器储存良好做法? (如颜色和类型) 还是仅仅依靠收集工作,把正确的实体退回临时收集?

Class ItemCollection : Inherits Collection(Of Item)
    Private _types as New List(Of ItemCollection) //Cache

    Function FilterByType(type) As ItemCollection
        If Not _types.KeyExists(type) Then
            _types.Add(type, New ItemCollection())
            For Each i in Me
                If i.Type = type Then _types(type).Add(i)
            Next
        End If
        Return _types(type)
    End Function

    //Same for FilterByColor(color)
End Class

Class Item
    Public Color = "Blue"
    Public [Type] = "One"
End Class
最佳回答

我建议,如果测试表明重新编制过滤名单是一个业绩问题,则保持简单的做法,开始并添加沥滤。 此外,通过使用列入清单的过滤方法或利用准则的延伸,过滤法可以大大简化。

filtered = Me.Where(i => i.Type = type)

(我可以坐在准确的yn子上,我从未在VB做过LINQ。) NET, I m a C# guy.

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