多线程处理中对象的内存占用及释放讨论

最新推荐文章于 2021-05-22 08:41:59 发布

benlee

最新推荐文章于 2021-05-22 08:41:59 发布

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分类专栏：代码讨论文章标签：多线程 integer button components windows class

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本文通过一个简单的Windows Forms应用展示了多线程环境下对象的创建与内存占用。在按钮点击事件中，创建了50个线程，每个线程对应一个test类实例，当线程执行完毕后触发Finish事件，调用System.GC.Collect()尝试回收内存。内容涉及到线程操作、对象生命周期和内存管理。

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Public Class Form1
Inherits System.Windows.Forms.Form

#Region " Windows 窗体设计器生成的代码 "

Public Sub New()
MyBase.New()

'该调用是 Windows 窗体设计器所必需的。
InitializeComponent()

'在 InitializeComponent() 调用之后添加任何初始化

End Sub

    '窗体重写 dispose 以清理组件列表。
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

'Windows 窗体设计器所必需的
Private components As System.ComponentModel.IContainer

    '注意: 以下过程是 Windows 窗体设计器所必需的
    '可以使用 Windows 窗体设计器修改此过程。
    '不要使用代码编辑器修改它。
    Friend WithEvents Button1 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Button1 = New System.Windows.Forms.Button
        Me.SuspendLayout()
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(56, 112)
        Me.Button1.Name = "Button1"
        Me.Button1.TabIndex = 0
        Me.Button1.Text = "Button1"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(292, 273)
        Me.Controls.Add(Me.Button1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)

End Sub

#End Region

    Private mthTest As Threading.Thread
    Private i As Integer
    Private WithEvents a As test

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        For i = 1 To 50
            a = New test
            a.ID = i
            mthTest = New Threading.Thread(AddressOf a.add)
            mthTest.Start()
        Next
    End Sub

    Private Sub k() Handles a.Finish
        System.GC.Collect()
    End Sub
End Class

Public Class test
Private mintID As Integer

Public Event Finish()

    Public Property ID() As Integer
        Get
            Return mintID
        End Get
        Set(ByVal Value As Integer)
            mintID = Value
        End Set
    End Property

    Public Sub add()
        Dim i As Integer
        For i = 0 To 100
            Debug.WriteLine("这是第" & mintID & "个线程，运行次数：" & i + 1)
        Next
        RaiseEvent Finish()
    End Sub
End Class