Question

所以我有这个进度条，我正在改变每次睡眠后的价值。有没有什么方法可以让Progress Bar直观地更新，而不是只是坐在0％并且在执行结束时跳到100％？

private Client getConnectionPDU()

    {

        // Client à retourné
        PrimS.Telnet.Client client = null;

        // Ouverture de la connection
        try
        {
            // --- Ouverture de la connexion
            client = new Client(rackToIP[selectedRack], addrPort, new System.Threading.CancellationToken());
            console.Text +=  client.Read();
            Thread.Sleep(sleep);
            progressBar.Value = 20;

            // --- Username
            client.WriteLine(username + enter);
            Thread.Sleep(sleep);
            progressBar.Value = 40;

            console.Text += "\n" + client.Read();
            Thread.Sleep(sleep);
            progressBar.Value = 60;

            // --- Password
            client.WriteLine(password + enter);
            Thread.Sleep(sleep);
            progressBar.Value = 80;
            console.Text += "\n" + client.Read();
            Thread.Sleep(sleep);
            progressBar.Value = 100; 

        }
        catch (Exception e)
        {
            console.Text += "\n" + e.Message;
            client = null;
        }

        // Scroll to end
        scroller.ScrollToEnd();

        return client;
    }

Answer 1

您的代码阻止了UI线程，从未让它有机会以新的大小重绘进度条，直到函数返回为止。您应该考虑使用async / await来避免阻止。

您需要进行一些更改才能正常工作：

将所有Thread.Sleep来电更改为await Task.Delay。
更改getConnectionPDU以返回Task<Client>。
将getConnectionPDU标记为async。

假设您的代码是通过单击按钮调用的，结果将如下所示（未经过测试，可能包含错误）：

private async void Button1_click(object sender, EventArgs e)
{
    var TheClient = await getConnectionPDU();
}

private async Task<Client> getConnectionPDU()
{

    // Client à retourné
    PrimS.Telnet.Client client = null;

    // Ouverture de la connection
    try
    {
        // --- Ouverture de la connexion
        client = new Client(rackToIP[selectedRack], addrPort, new System.Threading.CancellationToken());
        console.Text +=  client.Read();
        await Task.Delay(sleep);
        progressBar.Value = 20;

        // --- Username
        client.WriteLine(username + enter);
        await Task.Delay(sleep);
        progressBar.Value = 40;

        console.Text += "\n" + client.Read();
        await Task.Delay(sleep);
        progressBar.Value = 60;

        // --- Password
        client.WriteLine(password + enter);
        await Task.Delay(sleep);
        progressBar.Value = 80;
        console.Text += "\n" + client.Read();
        await Task.Delay(sleep);
        progressBar.Value = 100; 

    }
    catch (Exception e)
    {
        console.Text += "\n" + e.Message;
        client = null;
    }

    // Scroll to end
    scroller.ScrollToEnd();

    return client;
}

Answer 2

我建议使用backgroundWorker线程。以下是您尝试执行的操作的类似问题： How to correctly implement a BackgroundWorker with ProgressBar updates?

c＃WPF进度条更新

2 个答案: