帮忙把 戏VB.NET的代码转为C#，因为有些关键字，好像在C#中没有对应的。

[JB-Zhang]

故名思义，这是一个图书集合的类，从 《MSDN开发精选》上抄的，但是在C#里都不知道怎么实现。
无法转换的关键字有：NotInheritable， Shadows

Public NotInheritable Class BookCollection : Inherits ArrayList
Default Public Shadows Property Item(ByVal productid As Integer) As Book
Get
Return Me(IndexOf(productid))
End Get
Set(ByVal Value As Book)
Me(IndexOf(productid)) = Value
End Set
End Property

Public Overloads Function Contains(ByVal productId As Integer) As Boolean
Return (-1 <> IndexOf(productId))
End Function

Public Overloads Function IndexOf(ByVal productId As Integer) As Integer
Dim index As Integer = 0
Dim item As Book

For Each item In Me
If item.productID = productId Then
Return index
End If

index += 1
Next

Return -1
End Function

Public Overloads Sub RemoveAt(ByVal productId As Integer)
RemoveAt(IndexOf(productId))
End Sub

Public Shadows Function Add(ByVal value As Book) As Integer
Return MyBase.Add(value)
End Function
End Class

[yufenfeila]

NotInheritable 对应 sealed

[hujiiori]

Shadows-->new

[JB-Zhang]

第一个shadows 方法的 Default 关键字呢？

[liulxmooo]

up

[JB-Zhang]

怎么没人来？

[smallMage]

学习

[caofengnan]

hehe

[linfengcyl]

this 吧