如何运行两个操作同时在C＃ [英] How Run Two Operations concurrently in C#

问题描述

我在WPF应用程序有问题。我有一个自定义的 CircularProgressBar 。当我从数据库中检索它需要几秒钟的数据。

I have a problem in my WPF app. I have a custom CircularProgressBar. When I retrieve data from database it takes a few seconds.

我想显示 CircularProgressBar 我的应用程序虽然该数据被检索

I would like to show the CircularProgressBar in my app while the data is retrieved.

这代码运行在 CircularProgressBar ：

CircularProgressBar cb = new CircularProgressBar();
stk.Children.Add(cb);

ThreadStart thStart = delegate()
{
    ThreadStart inv = delegate()
    {
        stk.Children.Remove(cb);

    };
    this.Dispatcher.Invoke(inv, null);
};

Thread myThread = new Thread(thStart);
myThread.Start();

在我的自定义类（打印机）。

in my custom class (Printer).

和在哪里我把这个窗口：

And where I call this window:

Printer p = new Printer();

p.Show();

//Code For retrieve  Data from DataBase

p.close();

所以发生这种情况： CircularProgressBar 显示了几秒钟，它没有运行。哪里是我的错误。

So this happens : CircularProgressBar shows for a few seconds and it not running. Where is my bug?

推荐答案

您可以简单地使用背景工人：

You can simply use background worker:

private BackgroundWorker bw = new BackgroundWorker();

bw.WorkerReportsProgress = true;
bw.WorkerSupportsCancellation = true;
bw.DoWork += new DoWorkEventHandler(bw_DoWork);
bw.ProgressChanged += new ProgressChangedEventHandler(bw_ProgressChanged);
bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bw_RunWorkerCompleted);

private void bw_DoWork(object sender, DoWorkEventArgs e)
{
//load data from database
System.Threading.Thread.Sleep(1);
worker.ReportProgress(progressbar_value);
}

private void bw_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
Progress.value= progressbar_value;
}

private void bw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
//progress completed
}

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