0

我创建了一个表单，每当我调用一个耗时的例程时，它就会弹出并显示一个进度条。UpdateProgress我通过该方法提供了我日常工作的进度。

我正在使用后台工作人员来允许用户移动表单并在此表单更新时继续开展业务。但是，表单会一直锁定，直到例程完成，然后快速将进度条增加到 100% 并退出（应该如此）。imo，进度条应该与对该UpdateProgress方法的调用进度一起更新。

我在这里做错了什么？

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;

namespace myNameSpace
{
    public partial class ProgressIndicator : Form
    {
        int progressPercentage;

        public ProgressIndicator()
        {
            InitializeComponent();
        }

        void progressUpdater_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            // update the UI with appropriate fields
            progressBar.Value = e.ProgressPercentage;
            labelCommunicating.Text = "In progress: " + e.ProgressPercentage + "% complete";
        }

        void progressUpdater_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            this.Close();
        }

        void progressUpdater_DoWork(object sender, DoWorkEventArgs e)
        {
            BackgroundWorker worker = sender as BackgroundWorker;

            while (true)
            {
                if (progressPercentage >= 100)
                {
                    break;
                }

                worker.ReportProgress(progressPercentage);

                Thread.Sleep(100);
            }
        }

        public void UpdateProgress(int progressPercentage)
        {
            this.progressPercentage = progressPercentage;
        }

        private void ProgressIndicator_Load(object sender, EventArgs e)
        {
            BackgroundWorker progressUpdater = new BackgroundWorker();
            progressUpdater.WorkerReportsProgress = true;
            progressUpdater.WorkerSupportsCancellation = true;
            progressUpdater.DoWork += new DoWorkEventHandler(progressUpdater_DoWork);
            progressUpdater.RunWorkerCompleted += new RunWorkerCompletedEventHandler(progressUpdater_RunWorkerCompleted);
            progressUpdater.ProgressChanged += new ProgressChangedEventHandler(progressUpdater_ProgressChanged);

            progressUpdater.RunWorkerAsync();
        }
    }
}
4

2 回答 2

1

这听起来像是一个牵强的解决方案，我认为您的问题在于while loop. 但是，更好的方法可能是通过使用例如简单地更新您的ProgressBar而不阻塞 UIInvoke();

Invoke(new myUpdate(updateProgress), pval);//call invoke whenever you need to update the progress bar assuming pval is an integer with the value to update with. This could be in a thread for instance.

//declare this as a class level delegate
private delegate void myUpdate(int progress);

//method to update progress bar
private void updateProgress(int progress)
{
    progressBar.Value = progress;
}
于 2012-07-30T22:11:44.220 回答
0

您可以以这种方式创建流程，这样您就不需要将调用包装在 Invoke 方法周围。

//delegate method
private delegate void updateProgressDelegate(int progress);

//actual method
private void updateProgress(int progress)
{
    if(this.InvokeRequired)
    {
        this.Invoke(new updateProgressDelegate(updateProgress), progress);
    }
    else
    {
        progressBar.value = progress;
    }
}
于 2012-07-30T22:42:10.190 回答