C#进度栏和计时器控件 [英] C# Progressbar and Timer control

问题描述

嗨
我正在编写一个需要显示进度条的应用程序，下面是代码示例.问题:百分比变量没有更新，它的值始终为零，为什么有什么主意?

Hi
I''m writing an application where i need to show a progressbar, below is a sample of the code. Problem: the percentage variable does not get updated, it''s value is always zero, any ideas why?

private void trTick_Tick(object sender, EventArgs e)
        {
            pbProg.Minimum = 0;
            pbProg.Maximum = 100;
            pbProg.Value = 1;
            if (pbProg.Value == pbProg.Maximum)
            {
                //trTick.Stop();
                trTick.Enabled = false;
                pbProg.Value = 0;
                pbProg.Enabled = false;
            }
            pbProg.Step = 1;
            pbProg.PerformStep();
            pbProg.Value++;
            int percentage = (pbProg.Value / pbProg.Maximum) * 100;
            lblProg.Text = "Current progress: " + percentage.ToString() + "%";

        }
private void btnStart_Click(object sender, EventArgs e)
      {
          trTick.Enabled = true;

      }

推荐答案

int percentage = (pbProg.Value / pbProg.Maximum) * 100;

您将在此处获得整数除法，因此第一部分最终为0.试试:

You''re getting integer division here, so the first part ends up as 0. Try:

int percentage = (pbProg.Value * 100) / pbProg.Maximum;

您必须调用pbProg.Update().

计时器不一定是必需的.您可以通过不同的方式来执行此操作.您可以使用for循环来增加进度条的值.

The timer is not necessarily required. You can do this in different ways. You can use a for loop to increase the value of the progress bar.

#region Using directives
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Windows.Forms;
namespace Progress_Bar_Example
{
    partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            
            //Set the Max. value the progress bar can hold to 100.

            progressBar1.Maximum = 100;
        
        }
        private void button1_Click(object sender, EventArgs e)
        {
            int value;
            for (value = 0; value != 1000; value++)
            {
                progressBar1.Value = progressBar1.Value + 1;
            }
  

        }
    }
}

这可能不是完美的方法，但仍然可以正常工作.可能还有许多其他解决方案.让我知道这是否有帮助

-
AJ

This may not be the perfect way of doing it but still it works fine. There may be many other solutions. Let me know if this was helpful

--
AJ

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