c# - 带有对话框的长期任务

我有一个长期运行的过程，我想在主应用程序表单上显示一个表单，解释该表单可以在无处不在的圆圈进度条上运行很长时间。我什么都无法正常工作。表单显示不正确或没有为进度圈设置动画。如果我尝试使用如图所示的其他方法，则该任务无法完成！

private void lbMethods_SelectedIndexChanged(object sender, EventArgs e)
    {
        switch (lbMethods.SelectedIndex)
        {
            case (int)Methods.none:
                break;
            case (int)Methods.Susan:
                Log("Starting Susan Edge Detection");
                Progressing("Please wait for edge detection");
                Task t = new Task(() => ProcessSusan());
                while (!t.IsCompleted)
                {
                    Application.DoEvents();
                }
                Log("Detection Finished");
                Progressing("", false);
                break;
            default:
                break;
        }
    }

    private void ProcessSusan()
    {
        Susan s = new Susan(CurrentImage);
        List<IntPoint> corners = s.GetCorners();
    }

    private void Progressing(string message, bool Show = true)
    {

        if (Show)
        {
            lblStatus.Text = message;
            Progress.Style = ProgressBarStyle.Continuous;
        }
        else
        {
            lblStatus.Text = "...";
            Progress.Style = ProgressBarStyle.Blocks;
        }
    }

长期运行的表单代码如下所示：

public partial class FrmProcessing : Form
{
    public string description { get; set; }

    public FrmProcessing(string description)
    {
        InitializeComponent();
        lblDescription.Text = description;

    }

    // Let the calling method close this form.
    public void Close()
    {

        this.Close();
    }


}

最佳答案

Application.DoEvents()通常被滥用。除了通过UI重新输入代码的常见问题之外，您还正在执行busy-waiting loop。

您没有指定要在何处显示模态对话框。据我了解，代码可能如下所示：

private void lbMethods_SelectedIndexChanged(object sender, EventArgs e)
{
    switch (lbMethods.SelectedIndex)
    {
        case (int)Methods.none:
            break;
        case (int)Methods.Susan:
            Log("Starting Susan Edge Detection");
            Progressing("Please wait for edge detection");

            var dialog = new FrmProcessing();
            dialog.StartTaskFunc = () =>
                Task.Run(ProcessSusan);
            dialog.ShowDialog();

            Log("Detection Finished");
            Progressing("", false);
            break;
        default:
            break;
    }
}

public partial class FrmProcessing : Form
{
    public Func<Task> StartTaskFunc { get; set; }

    public string description { get; set; }

    public FrmProcessing(string description)
    {
        InitializeComponent();
        lblDescription.Text = description;

        // async event handler for "Form.Load"
        this.Load += async (s, e) =>
        {
            // start the task and await it
            await StartTaskFunc();
            // close the modal form when the task finished
            this.Close();
        };
    }
}

这只是一个基本的实现。您应该为ProcessSusan添加一些异常处理，取消和进度报告逻辑。这是有关如何执行此操作的很好的阅读：Enabling Progress and Cancellation in Async APIs。

我最近也回答了a similar question。看看是否可以使用相同的方法。

关于c# - 带有对话框的长期任务，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/21068965/