VB.NET 2010,Framework 3.5
在完成自定义对象类型列表后,尝试弄清楚如何获取内存。我知道强制列表超出范围将重新分配它正在使用的内存,但我需要一种实用的方式。有谁知道怎么做?
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,我尝试了处理表单,关闭它等等并加载一个单独的表单,内存仍然没有回来。我猜GC还没有进行收集业务。我想看GC的工作时间要长一点
这个名叫Jods的仆人很好奇为什么我想以编程方式这样做。我正在做的工作类型,创建大量非常动态的自定义列表,我需要一种方法来销毁它们并确定旧的东西已经消失。这些应用程序有时会持续运行数周。 。我需要密切关注记忆等等。
如果有兴趣,请参阅下面的代码,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
答案 0 :(得分:2)
我很好奇为什么你需要一种方法来编程。当您的对象不再使用时(所有引用都不可访问/超出范围/或设置为null),下一次运行垃圾收集器将回收内存。
如果要按代码触发集合,则应调用GC.Collect()。如果你有终结器,你可能需要调用GC.WaitForPendingFinalizers()然后再调用GC.Collect()。
请注意,调用这些方法通常都不赞成,所以我很好奇你的情况。
答案 1 :(得分:-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,此时它所使用的内存为“垃圾”,已准备好由.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。