加载程序闪烁不渲染WinForm

Question

我试图运行一个漫长的过程来检索数据，并在检索数据时以对话框形式显示加载程序屏幕（简单形式）。我遇到的问题是后台工作程序正在运行时，加载程序屏幕只是闪烁而没有在加载程序窗体中呈现标签。后台运行时，您只能看到灰色矩形，如下所示。

有人知道为什么加载程序表单没有显示标签以及为什么闪烁吗？

private void LoadInfo()
{
    try
    {
        workingLoader = new WorkingLoader();
        mainWorker = new BackgroundWorker();

        mainWorker.DoWork += MainWorker_DoWork;
        mainWorker.RunWorkerCompleted += MainWorker_RunWorkerCompleted;

        mainWorker.RunWorkerAsync();
        workingLoader.ShowDialog();
    }
    catch (Exception ex)
    {
        if (workingLoader != null)
        {
            workingLoader.Dispose();
        }
    }
}

Answer 1

internal static class NativeWinAPI
{
internal static readonly int GWL_EXSTYLE = -20;
internal static readonly int WS_EX_COMPOSITED = 0x02000000;

[DllImport("user32")]
internal static extern int GetWindowLong(IntPtr hWnd, int nIndex);

[DllImport("user32")]
internal static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
}

And your form constructor should look as follows:


public MyForm()
{
InitializeComponent();

int style = NativeWinAPI.GetWindowLong(this.Handle, NativeWinAPI.GWL_EXSTYLE);
style |= NativeWinAPI.WS_EX_COMPOSITED;
NativeWinAPI.SetWindowLong(this.Handle, NativeWinAPI.GWL_EXSTYLE, style);
}

In the code above, you might change this.Handle to something like MyFlickeringPanel.Handle