问关于异步任务和处理

EN

<Button Content="Attach" Click="OnClickAttach"/>

private async void OnClickAttach(Object sender, RoutedEventArgs e)
{
    AttachmentResult result = await m_ViewModel.Attach();

    switch (result)
        // Different MessageBox depending on the result.
}

// MemoryProcess class is just a wrapper for Process' handle and memory regions.
private MemoryProcess m_MemoryProcess;

public async Task<AttachmentResult> Attach()
{
    AttachmentResult result = AttachmentResult.Success;
    MemoryProcess memoryProcess = NativeMethods.OpenProcess(m_SelectedBrowserInstance.Process);

    if (memoryProcess == null)
        result = AttachmentResult.FailProcessNotOpened;
    else
    {
        Boolean check1 = false;
        Boolean check2 = false;

        foreach (MemoryRegion region in memoryProcess)
        {
            // I perform checks on Process' memory regions and I eventually change the value of check1 or check2...
            await Task.Delay(1);
        }

        if (!check1 && !check2)
        {
            NativeMethods.CloseHandle(memoryProcess.Handle);
            result = AttachmentResult.FailProcessNotValid;
        }
        else
        {
            // I keep the Process opened for further use. I save it to a private variable.
            m_MemoryProcess = memoryProcess;
            m_MemoryProcess.Check1 = check1;
            m_MemoryProcess.Check2 = check2;
        }
    }

    return result;
}

protected override void OnClosing(CancelEventArgs e)
{
    m_ViewModel.Detach();
    base.OnClosing(e);
}

public void Detach()
{
    if (m_MemoryProcess != null)
    {
        if (m_MemoryProcess.Check1)
            // Do something...

        if (m_MemoryProcess.Check2)
            // Do something...

        NativeMethods.CloseHandle(m_MemoryProcess.Handle);
        m_MemoryProcess = null;
    }
}