这个类的名称应该是什么？
命名类有时很困难。你认为班级名称应该是什么？
我最初创建该类是为了用作缓存，但可以看到它可能还有其他用途。使用该类的示例代码。
Dim cache = New NamePendingDictionary(Of String, Sample)
Dim value = cache("a", Function() New Sample())
这是需要名称的类。
' <summary> '
' Enhancement of <see cref="System.Collections.Generic.Dictionary"/>. See the Item property '
' for more details. '
' </summary> '
' <typeparam name="TKey">The type of the keys in the dictionary.</typeparam> '
' <typeparam name="TValue">The type of the values in the dictionary.</typeparam> '
Public Class NamePendingDictionary(Of TKey, TValue)
Inherits Dictionary(Of TKey, TValue)
Delegate Function DefaultValue() As TValue
' <summary> '
' Gets or sets the value associated with the specified key. If the specified key does not exist '
' then <paramref name="createDefaultValue"/> is invoked and added to the dictionary. The created '
' value is then returned. '
' </summary> '
' <param name="key">The key of the value to get.</param> '
' <param name="createDefaultValue"> '
' The delegate to invoke if <paramref name="key"/> does not exist in the dictionary. '
' </param> '
' <exception cref="T:System.ArgumentNullException"><paramref name="key" /> is null.</exception> '
Default Public Overloads ReadOnly Property Item(ByVal key As TKey, ByVal createDefaultValue As DefaultValue) As TValue
Get
Dim value As TValue
If createDefaultValue Is Nothing Then
Throw New ArgumentNullException("createValue")
End If
If Not Me.TryGetValue(key, value) Then
value = createDefaultValue.Invoke()
Me.Add(key, value)
End If
Return value
End Get
End Property
End Class
编辑：根据 Abel 的建议，我将该类命名为 ValueCache。
Naming classes is sometimes hard. What do you think name of the class should be?
I originally created the class to use as a cache but can see its may have other uses. Example code to use the class.
Dim cache = New NamePendingDictionary(Of String, Sample)
Dim value = cache("a", Function() New Sample())
And here is the class that needs a name.
' <summary> '
' Enhancement of <see cref="System.Collections.Generic.Dictionary"/>. See the Item property '
' for more details. '
' </summary> '
' <typeparam name="TKey">The type of the keys in the dictionary.</typeparam> '
' <typeparam name="TValue">The type of the values in the dictionary.</typeparam> '
Public Class NamePendingDictionary(Of TKey, TValue)
Inherits Dictionary(Of TKey, TValue)
Delegate Function DefaultValue() As TValue
' <summary> '
' Gets or sets the value associated with the specified key. If the specified key does not exist '
' then <paramref name="createDefaultValue"/> is invoked and added to the dictionary. The created '
' value is then returned. '
' </summary> '
' <param name="key">The key of the value to get.</param> '
' <param name="createDefaultValue"> '
' The delegate to invoke if <paramref name="key"/> does not exist in the dictionary. '
' </param> '
' <exception cref="T:System.ArgumentNullException"><paramref name="key" /> is null.</exception> '
Default Public Overloads ReadOnly Property Item(ByVal key As TKey, ByVal createDefaultValue As DefaultValue) As TValue
Get
Dim value As TValue
If createDefaultValue Is Nothing Then
Throw New ArgumentNullException("createValue")
End If
If Not Me.TryGetValue(key, value) Then
value = createDefaultValue.Invoke()
Me.Add(key, value)
End If
Return value
End Get
End Property
End Class
EDIT: On Abel's advice I've named the class ValueCache.
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评论（4）
一般来说，最好根据类的预期用途来命名它。如果用户后来发现其他用途是可能的或可行的，请不要立即重命名您的类。重命名类的原因应该只是为了使其预期用途更清晰。
（编辑）其他人对新名称发表了评论，例如
CacheManager、DeferredCache、LazyCollection、AssignedValueMap等。初衷很笼统，就用这样的名字。如果预期用途更具体，请将其命名为：CookiesCache、UsersList等。如果您发现自己处于其他特定类的通用用例的情况，创建一个更通用的基类，具有通用名称，并针对特定（原始）用例使用特定子类。这就是面向对象的意义;-)
In general, it's best to name a class after its intended usages. If users later find that another usage is possible or feasible, don't run off renaming your class. A reason to rename your class should only be to make its intended use clearer.
(edit) Others have commented on new names, like
CacheManager,DeferredCache,LazyCollection,AssignedValueMapetc. If the original intention is very generic, use such names. If the intended use is more specific, name it such:CookiesCache,UsersListetc.If you find yourself in the situation where you have a generic use case for an otherwise specific class, create a more general base class, with a general name, and use a specific subclass for the specific (original) use case. That's what OO is about ;-)
您可以将其称为
LazyDictionary，因为项目在需要时可能不会被初始化:)什么是
createDefaultValue？这是作为构造函数的一部分初始化的吗？You could call it a
LazyDictionary, since items may not be initialized until they are needed :)What is
createDefaultValue? Is this initialized as part of the constructor?调用此类
CacheManager，并且不要在其中放置其他功能。Call this class
CacheManagerand DO NOT put other functionaities in it.我认为正如阿贝尔所建议的，“地图”是一个很好用的术语。我会考虑将类命名为“AssignedValueMap”之类的名称，然后使用更具体的变量名称来明确在每种情况下如何使用“AssignedValueMap”。因此，当您将它用于待定名称时，我会将关联变量声明为 DimendingNamesMap = NewAssignedValueMap(OfString, Sample)。
I think as Abel suggested Map is a good term to use. I would consider naming the class something like AssignedValueMap and then use more specific variable names to make clear how you're using the AssignedValueMap in each case. So where you're using it for pending names I'd declare the associated variable as Dim pendingNamesMap = New AssignedValueMap(Of String, Sample).