Question

我试图在Windows 7，VS 2008上的多形式C＃.Net应用程序中追逐内存泄漏。

我找到了这个SO帖子，表明应该自动调用第二个表格的终结者 this.Dispose() doesn't release memory used by Form after closing it. 但是，它对我不起作用。

每次弹出第二个表单（包含一个大字符串和一个PictureBox）时，即使我强制使用GC，应用程序使用的内存量也会增加。有趣的是，String的终结器IS被调用。我在两个表单的Dispose方法中添加了一个日志; Form2的处理被称为。

代码是 Form1（主要表格）

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace MemoryLeakTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        ~Form1()
        {
            System.Diagnostics.Debugger.Log(0, "", "Form1.Destructor has been called.\n");
        }

        private void GC_Click(object sender, EventArgs e)
        {
            System.GC.Collect();
            System.GC.WaitForPendingFinalizers();
            System.GC.Collect();
            System.GC.WaitForPendingFinalizers();
        }

        private void OpenForm_Click(object sender, EventArgs e)
        {
            Form secondForm = null;

            if (secondForm == null)
            {
                secondForm = new Form2();
                secondForm.Show();
            }

            secondForm = null;
        }

        private void UpdateMemory_Click(object sender, EventArgs e)
        {
            long memory =  System.GC.GetTotalMemory(false);
            this.MemoryUsage.Text = "Memory usage: " +
                String.Format("{0:n}", memory) +
                " bytes";
        }

        private void AllocateString_Click(object sender, EventArgs e)
        {
//            StringWrapper wrapper = new StringWrapper();
        }
    }

    public class StringWrapper
    {
        String str = new String('*', 1024 * 1024);

        ~StringWrapper()
        {
            System.Diagnostics.Debugger.Log(0, "", "StringWrapper finalizer has been called.\n");
        }
    }
}

和Form2是

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace MemoryLeakTest
{
    public partial class Form2 : Form
    {
        StringWrapper wrapper = new StringWrapper();
        public Form2()
        {
            InitializeComponent();
            this.pictureBox1.Image = Image.FromFile("C:/Windows/Web/Wallpaper/Windows/img0.jpg");
        }

        ~Form2()
        {
            System.Diagnostics.Debugger.Log(0, "", "Form2.Finalizer has been called.\n");
        }
    }
}

我没有包含设计器生成的代码，但如果需要可以添加它

没有发布图片框的表格

0 个答案: