c# - Backgroundworker 打开主窗口拥有的第二个窗口

Question

我面临这个问题:我有两个窗口(主窗口和自定义消息)。在我的代码中，我需要使用一个 backgroundworker。在 Dowork 方法中，我想打开与主窗口具有相同大小(宽度/高度)的第二个窗口(自定义消息)。因为我不知道主窗口的大小，所以我需要让第一个窗口拥有第二个窗口。那是我的代码:

    private void Starter_Click(object sender, RoutedEventArgs e)
    {
        string linkaddress = Address.Text;

        BackgroundWorker CheckValidAddressBW = new BackgroundWorker();
        CheckValidAddressBW.DoWork += CheckValidAddressBWDoWork;
        CheckValidAddressBW.RunWorkerCompleted += CheckValidAddressBWComplete;
        CheckValidAddressBW.RunWorkerAsync(linkaddress);
    }

    static void CheckValidAddressBWDoWork(object sender, DoWorkEventArgs e)
    {
        string bandaddress =""+ e.Argument;
        bool isValid = false;
        /* STUFF INSIDE */
        e.Result = isValid;
    }
    static void CheckValidAddressBWComplete(object sender, RunWorkerCompletedEventArgs e)
    {
        bool result =(bool) e.Result;
        if(result==false)
        {
            CustomMessage cm = new CustomMessage ();
            cm.Width = 800;                
            cm.Height = 600;
            cm.Show();
        }
    }

所以在这段代码中我想做的是这样的:

        if(result==false)
        {
            CustomMessage cm = new CustomMessage {Owner=this}; //WHERE this means the mainwindow
            cm.Width = this.ActualWidth;                
            cm.Height = this.ActualHeight;
            cm.Show();
        }

因为我使用的是后台 worker ，所以我不能使用“this”这个词。所以我想知道是否有办法做到这一点。提前谢谢你。

注意我希望我的问题很清楚:)

Answer 1

我认为您需要将主窗口对象作为 BackgroundWorker 的参数之一传递。这里我以 Tuple 对象为例，但您可能需要创建更合适的类对象:

private void Starter_Click(object sender, RoutedEventArgs e)
{
    var linkaddress = Address.Text;

    BackgroundWorker CheckValidAddressBW = new BackgroundWorker();
    CheckValidAddressBW.DoWork += CheckValidAddressBWDoWork;
    CheckValidAddressBW.RunWorkerCompleted += CheckValidAddressBWComplete;
    CheckValidAddressBW.RunWorkerAsync(Tuple.Create<string, Window>(linkaddress, this));
}
static void CheckValidAddressBWDoWork(object sender, DoWorkEventArgs e)
{
    Tuple<string, Window> args = e.Argument as Tuple<string, Window>;
    string bandaddress = args.Item1;
    bool isValid = false;
    /* STUFF INSIDE */
    e.Result = Tuple.Create<bool, Window>(isValid, args.Item2);
}
static void CheckValidAddressBWComplete(object sender, RunWorkerCompletedEventArgs e)
{
    Tuple<bool, Window> args = e.Result as Tuple<bool, Window>;
    bool result = args.Item1;
    if (result == false)
    {
        CustomMessage cm = new CustomMessage { Owner = args.Item2 };
        cm.Width = 800;
        cm.Height = 600;
        cm.Show();
    }
}