在UI中显示繁忙指示器控件

本文关键字：指示器 控件 显示 UI | 更新日期: 2023-09-27 18:27:32

我修改了代码，但现在我遇到了另一个问题。在验证用户信息的if语句中发生InvalidOperation异常。它说调用线程不能访问这个对象，因为另一个线程拥有它。有什么建议吗？

 private void finishConfigButton_Click(object sender, RoutedEventArgs e)
    {
        BackgroundWorker worker = new BackgroundWorker();
        worker.WorkerSupportsCancellation = true;
        bool validated = false;
        errorLabel.Visibility = System.Windows.Visibility.Collapsed;
        validationProfile.IsBusy = true;
        finishConfigButton.IsEnabled = false;
        backToLoginHyperlink.IsEnabled = false;
        worker.DoWork += (o, ea) =>
        {
            if (newUser.ValidateNewUserInformation(newNameTextBox.Text, newEmailTextBox.Text, newUsernameTextBox.Text, newPasswordPasswordBox.Password, ref errorLabel))
            {
                validated = true;
                string activeDir = Environment.SystemDirectory.Substring(0, 1) + @":'Users'" + Environment.UserName + @"'My Documents'SSK'Users";
                string newPath = System.IO.Path.Combine(activeDir, newUser.Username);
                Directory.CreateDirectory(newPath);
                newUser.SaveUserData(newUser);
                newPath = System.IO.Path.Combine(activeDir, newUser.Username + @"'Settings");
                Directory.CreateDirectory(newPath);
                newUserSettings.SetDefaultValues();
                newUserSettings.SaveSettings(newUser, newUserSettings);
            }
            else
                validated = false;
            if (worker.CancellationPending)
            {
                ea.Cancel = true;
                return;
            }
        };
        worker.RunWorkerCompleted += (o, ea) =>
        {
            validationProfile.IsBusy = false;
            finishConfigButton.IsEnabled = true;
            backToLoginHyperlink.IsEnabled = true;
        };
        worker.RunWorkerAsync(this);
        if (validated)
        {
            IntelliMonitorWindow intelliMonitor = new IntelliMonitorWindow(newUser, newUserSettings);
            intelliMonitor.Show();
            this.Close();
        }
        else
            errorLabel.Visibility = System.Windows.Visibility.Visible;
    }

在UI中显示繁忙指示器控件

您在这里所做的是在UI线程上运行所有内容。这意味着，当重代码正在运行时，您会阻止UI重新绘制，因此validationProfile直到方法结束时才会更新，其中IsBusy设置为false。

您需要做的是将繁重的代码处理到一个新的线程中，该线程可以同时更新UI。

看看扩展工具包的创建者Brian Lagunas写的这篇博客文章：http://elegantcode.com/2011/10/07/extended-wpf-toolkitusing-the-busyindicator/

他解释了如何在BackgroundWorker中使用BusyIndicator。

XAML代码中的繁忙指示符没有任何内容。放入一些控件：

<wpfet:BusyIndicator Name="validationProfile" IsBusy="False" BusyContent="Working...Please wait"  DisplayAfter="0" Background="DimGray">
    <Grid>
        ...
    </Grid>
</wpfet:BusyIndicator>

如果您更改为忙，这些控件将被禁用，并且BusyIndicator将显示在它们的上方。

我想你想用BusyIndicator包装整个<Grid Background="LightGray">。

使用后台工作线程或新线程来运行繁重的进程并释放UI线程。这可以帮助您更新UI，即使后台进程正在运行

例如：

public void finishConfigButton_Click()
{
    worker = new BackgroundWorker();
    worker.DoWork += delegate(object s, DoWorkEventArgs args)
    {
        //Do the heavy work here
    };
    worker.RunWorkerCompleted += delegate(object s, RunWorkerCompletedEventArgs args)
    {
        //Things to do after the execution of heavy work
        validationProfile.IsBusy = false;
    };
    validationProfile.IsBusy= true;
    worker.RunWorkerAsync();
    }
}

我终于弄明白了。不能在worker内部使用UI对象。DoWork块。我稍微修改了代码，现在它可以工作了。

 private void finishConfigButton_Click(object sender, RoutedEventArgs e)
    {
        BackgroundWorker worker = new BackgroundWorker();
        worker.WorkerSupportsCancellation = true;
        errorLabel.Visibility = System.Windows.Visibility.Collapsed;
        validationProfile.IsBusy = true;
        finishConfigButton.IsEnabled = false;
        backToLoginHyperlink.IsEnabled = false;
        bool validated = false;
        string newName = newNameTextBox.Text;
        string newEmail = newEmailTextBox.Text;
        string newUsername = newUsernameTextBox.Text;
        string newPassword = newPasswordPasswordBox.Password;
        string errorMessage = "Unknown error.";
        worker.DoWork += (o, ea) =>
        {
            if (newUser.ValidateNewUserInformation(newName, newEmail, newUsername, newPassword, ref errorMessage))
            {
                string activeDir = Environment.SystemDirectory.Substring(0, 1) + @":'Users'" + Environment.UserName + @"'My Documents'SSK'Users";
                string newPath = System.IO.Path.Combine(activeDir, newUser.Username);
                Directory.CreateDirectory(newPath);
                newUser.SaveUserData(newUser);
                newPath = System.IO.Path.Combine(activeDir, newUser.Username + @"'Settings");
                Directory.CreateDirectory(newPath);
                newUserSettings.SetDefaultValues();
                newUserSettings.SaveSettings(newUser, newUserSettings);
                validated = true;
            }
            else
                ea.Cancel = true;
        };
        worker.RunWorkerCompleted += (o, ea) =>
        {
            if (validated)
            {
                IntelliMonitorWindow intelliMonitor = new IntelliMonitorWindow(newUser, newUserSettings);
                intelliMonitor.Show();
                this.Close();
            }
            validationProfile.IsBusy = false;
            finishConfigButton.IsEnabled = true;
            backToLoginHyperlink.IsEnabled = true;
            errorLabel.Visibility = System.Windows.Visibility.Visible;
            errorLabel.Content = errorMessage;
        };
        worker.RunWorkerAsync();
    }
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