c#进度条滞后问题。

楚楚3107 2017-08-30 02:26:16

问题描述：
点击开始时：label中的数据已开始走到10%左右，进度条才从0开始走。
等到label处理完毕时，进度条还没有到头，这样很明显显得很假。一个快，一个慢。以下是代码，求大神帮忙看下：
/// <summary>
/// 后台线程
/// </summary>
private BackgroundWorker bkWorker = new BackgroundWorker();

/// <summary>
/// 步进值
/// </summary>
private int percentValue = 0;

public Form1()
{
InitializeComponent();

bkWorker.WorkerReportsProgress = true;
bkWorker.WorkerSupportsCancellation = true;
bkWorker.DoWork += new DoWorkEventHandler(DoWork);
bkWorker.ProgressChanged += new ProgressChangedEventHandler(ProgessChanged);
bkWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(CompleteWork);
}

public void DoWork(object sender, DoWorkEventArgs e)
{
// 事件处理，指定处理函数
e.Result = ProcessProgress(bkWorker, e);
}

public void ProgessChanged(object sender, ProgressChangedEventArgs e)
{
// bkWorker.ReportProgress 会调用到这里，此处可以进行自定义报告方式
this.progressBar1.Value = e.ProgressPercentage;//进度条的值/步进
int percent = (int)(e.ProgressPercentage / percentValue);
this.label1.Text = "处理进度:" + Convert.ToString(percent) + "%";
}

public void CompleteWork(object sender, RunWorkerCompletedEventArgs e)
{
this.label1.Text = "处理完毕!";
}

private int ProcessProgress(object sender, DoWorkEventArgs e)
{
for (int i = 0; i <= 100; i++)
{
if (bkWorker.CancellationPending)
{
e.Cancel = true;
return -1;
}
else
{
// 状态报告
bkWorker.ReportProgress(i);
// 等待，用于UI刷新界面，很重要
System.Threading.Thread.Sleep(100);

}
}

return -1;
}

private void button1_Click(object sender, EventArgs e)
{
percentValue = 1;
this.progressBar1.Maximum = 100;
// 执行后台操作
bkWorker.RunWorkerAsync();
}
}

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无情时尚 2017-09-04

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不知道这样行不行

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

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private int num = 0;
        private void button1_Click(object sender, EventArgs e)
        {
            //只执行这一个方法更新界面
            ThreadUpdate(num+=10);
        }

        private void ThreadUpdate(int num)
        {
            //新开一个后台线程，并开始执行
            new Thread(delegate ()
            {
                UpdateBar(progressBar1, num);
                UpdateLab(label1, num);
            })
            { IsBackground = true }.Start();
        }

        private void UpdateBar(ProgressBar bar, int num)
        {
            new Action(() =>
            {
                //更新界面进度条的数值
                bar.Invoke(new Action(() =>
                {
                    if (num >= bar.Minimum && num <= bar.Maximum)
                        bar.Value = num;
                }));
            }).Invoke();
        }

        private void UpdateLab(Label lab, int str)
        {
            new Action(() =>
            {
                //更新界面Lab的数值
                lab.Invoke(new Action(() =>
                {
                    lab.Text = "处理进度： " + str + " %";
                }));
            }).Invoke();
        }
    }
}

楚楚3107 2017-09-01