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VB.NET 2010，框架 3.5

在完成自定义对象类型列表后，试图弄清楚如何取回内存。我知道强制列表超出范围会重新分配它正在使用的内存，但我需要一种务实的方法。有谁知道如何做到这一点？

Public Class List_Of_T_Test
    Private MyTestClass As New List(Of TestClass)


Private Sub List_Of_T_Test_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
    Const LIST_COUNT As Integer = 5000000
    Dim Count As Integer = 0

    MsgBox("Note 'PF usage' on Windows Task Manager 'before the 5m list' is created")

    Do Until Count > LIST_COUNT ' 5 million iterations 
        MyTestClass.Add(New TestClass With {.Value1 = CStr(Count), .Value2 = CStr(Count + 1)})
        Count = Count + 1
    Loop

    MsgBox("Note 'PF usage' on Windows Task Manager 'after the 5m list' was created")

    DestroyMyTestClassList()

    MsgBox("When flow arrives here, I need MyTestClass to be gone, all memory to have been reallocated, or close to where it was before the list was created")

End Sub

Private Sub DestroyMyTestClassList()

    ' Does anyone know what code to put here, code that would totally destroy 
    ' the MyTestClass and the 5 million items in it, reallocate the memory used 
    ' by the list Of(T) MyTestClass

    ' MyTestClass.Clear()   ' Doesn't work  ??
    ' MyTestClass = Nothing ' Doesn't work  ?

End Sub
Public Class TestClass

    Public Property Value1 As String
    Public Property Value2 As String

End Class

End Class

我理解让它超出范围的想法，但我必须告诉你，我尝试处理表单，关闭它等并加载单独的表单，但内存仍然没有回来。我猜 GC 还没有处理它的收集业务或其他什么。我想我得再看 GC 的工作时间

这位名叫 Jods 的家伙很好奇我为什么要以编程方式执行此操作。我正在做的工作类型是创建大量类型的自定义列表，这些列表本质上是非常动态的，我需要一种方法来销毁它们并重建它们，确保旧的东西已经消失了。这些应用程序有时会连续运行数周。. 我需要密切注意记忆和诸如此类的东西。

如果有人感兴趣，请参阅下面的代码，该代码似乎从对象列表中重新分配内存

Public Class List_Of_T_Test
Private MyTestClass As New List(Of TestClass)

Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
    Const LIST_COUNT As Integer = 5000000
    Dim Count As Integer = 1

    Do Until Count > LIST_COUNT ' 5 million iterations 
        MyTestClass.Add(New TestClass With {.Value1 = CStr(Count), .Value2 = CStr(Count + 1)})
        Count = Count + 1
    Loop
    MsgBox(MyTestClass.Count.ToString)
End Sub

Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles Button2.Click
    ' This seems to completely reallocate the memory, paste this into a form's code, 
    ' add two buttons, click button1 once, or few times while watching the 
    ' 'Windows Task Manager' PF Usage.

    ' Then Click button2 once and the memory spike levels off, it all comes back

    MyTestClass = New List(Of TestClass)
    GC.Collect()  ' ?
End Sub

Private Class TestClass

    Public Property Value1 As String
    Public Property Value2 As String

End Class

End Class
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2 回答 2

2

我很好奇为什么您需要一种以编程方式执行此操作的方法。当您的对象不再使用时（所有引用都无法访问/超出范围/或设置为 null），内存将由垃圾收集器的下一次运行回收。

如果你想通过代码触发一个集合，你应该调用 GC.Collect()。如果您有终结器，您可能必须再次调用 GC.WaitForPendingFinalizers() 和 GC.Collect()。

请注意，调用这些方法通常是不受欢迎的，所以我对你的情况很好奇。

于 2013-07-22T17:47:42.673 回答
-1

当 .NET 框架实例化一个对象时，它会在托管堆上为该对象分配内存。该对象保留在堆上，直到它不再被任何活动代码引用，此时它使用的内存是“垃圾”，准备好由 .NET 垃圾收集器 (GC) 进行内存释放。在 GC 释放内存之前，框架调用对象的 Finalize() 方法，但开发人员负责调用 Dispose() 方法。

因此，只需调用对象的 Dispose() 方法即可。

于 2013-07-22T17:53:56.780 回答