我试图限制我的通用列表的大小,以便在它包含一定数量的值后,它将不再添加.
我试图使用List对象的Capacity属性执行此操作,但这似乎不起作用.
Dim slotDates As New List(Of Date)
slotDates.Capacity = 7
人们会如何建议限制列表的大小？
我试图避免在添加每个对象后检查List的大小.
有几种不同的方法可以将内容添加到List< T>：Add,AddRange,Insert等.
考虑一个继承自Collection< T>的解决方案：
Public Class LimitedCollection(Of T)
Inherits System.Collections.ObjectModel.Collection(Of T)
Private _Capacity As Integer
Public Property Capacity() As Integer
Get
Return _Capacity
End Get
Set(ByVal value As Integer)
_Capacity = value
End Set
End Property
Protected Overrides Sub InsertItem(ByVal index As Integer,ByVal item As T)
If Me.Count = Capacity Then
Dim message As String =
String.Format("List cannot hold more than {0} items",Capacity)
Throw New InvalidOperationException(message)
End If
MyBase.InsertItem(index,item)
End Sub
End Class
这样,无论您是添加还是插入,都会尊重容量.