Question

基于David Veeneman的Code Project article on Windows Forms User Settings，我一直在努力保存应用程序的起始位置和起始大小。

它在单个实例中完美运行，但是当我将它扩展到多个实例时，我遇到了问题。

我已经处理了有关加载设置和将设置保存在互斥锁中的部分，以保护写入和设置文件的写入。

我希望窗口从最后一个已知位置堆叠。这似乎在大多数情况下工作得很好，但是如果我快速开始打开四五个窗口，前三个将完美打开，那么将有一个间隙，之后一些开始在同一位置打开。

呈现表单/应用程序：

 private Mutex saveSetting;
 private const int START_LOCATION_OFFSET = 20;

 private void MainForm_Load(object sender, EventArgs e)
    {
        // Get the mutex before the reading of the location
        // so that you can't have a situation where a window drawn
        // in the incorrect position.

        this.saveSetting = new Mutex(false, "SaveSetting");
        this.saveSetting.WaitOne();

        this.LoadWindowStartSizeAndLocation();
        .
        .
        .
        .
        .

        this.saveSetting.ReleaseMutex();
    }

加载设置：

private void LoadWindowStartSizeAndLocation()
        {
            // Set window location
            if (Settings.Default.WindowLocation != null)
            {
                System.Drawing.Point startLocation = 
                  new System.Drawing.Point
                     (Settings.Default.WindowLocation.X + START_LOCATION_OFFSET,
                      Settings.Default.WindowLocation.Y + START_LOCATION_OFFSET);

                this.Location = startLocation;
                Settings.Default.WindowLocation = startLocation;

                Settings.Default.Save();
            }

            // Set window size
            if (Settings.Default.WindowSize != null)
            {
                this.Size = Settings.Default.WindowSize;
            }
        }

保存设置：

    private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
    {
        try
        {
            this.SaveWindowSizeAndLocationForNextStart();                
        }
        catch (Exception ex)
        {
            System.Diagnostics.Debug.Assert(false, ex.Message);
        }
    }

    /// <summary>
    /// Save the Window Size And Location For the next Application Start up.
    /// </summary>
    private void SaveWindowSizeAndLocationForNextStart()
    {
        if (this.WindowState != FormWindowState.Minimized)
        {
            // Copy window location to app settings
            Settings.Default.WindowLocation = this.Location;
            Settings.Default.WindowSize = this.Size;
        }
        try
        {
            this.saveSetting = new Mutex(false, "SaveSetting");
            this.saveSetting.WaitOne();

           Settings.Default.Save();
        }
        catch
        {
            // Do nothing. It won't permanently disable the system if we
            // can't save the settings.
        }
        finally
        {
            this.saveSetting.ReleaseMutex();
        }
    }

谁能告诉我我在做什么？或者如何基于上面的代码我可以将两个实例渲染到相同的起始位置？

由于甲

Answer 1

问题是在获取互斥锁之前加载了设置。获取互斥锁后调用Settings.Default.Reload()。

加载表单设置时，互斥锁的行为不正常

1 个答案: