关于进度条更新 [英] Regarding progressbar update

问题描述

我正在使用类似的代码：

  private   void  backgroundWorker1_ProgressChanged（ object  sender，ProgressChangedEventArgs e）
 {
 progressBar1.Value = e.ProgressPercentage; 
} 
 
  private   void  backgroundWorker1_RunWorkerCompleted（ object  sender，RunWorkerCompletedEventArgs e）
 {
 MessageBox.Show（ 完整）; 
} 
 
 
 私有  void  backgroundWorker1_DoWork（< span class =code-keyword> object  sender，DoWorkEventArgs e）
 {
 
  int  [] arr =  new   int  [ 21 ]; 
  for （ int  i =  1 ; i <  =  20 ; i ++）
 {
 arr [我] =我; 
 Thread.Sleep（ 100 ）; 
  int  m =（i / arr.Length）* 100; 
 backgroundWorker1.ReportProgress（i * m）; 
} 
} 

进度条未更新。但是，如果我将m替换为5，则可以看到进度。请帮助..在原始程序中我必须使用上述方法。谢谢。 ：）

解决方案

嗯...记住你的整数数学吗？

（整数，介于1和1之间20个包含）/（整数，值21）== 0 

所以...

  int  m =（i / arr.Length）* 100; 
 

总是给 m 零。

试试这个：

< pre lang =c＃> int m =（i * 100 ）/ arr.Length;

整数除法导致它;

  int  m =（i / arr.Length）* 100; 
 

i 除以 arr .lenght 将始终为零。



将其更改为

 < span class =code-keyword> int  m =（ int ）（（i /（ double )arr.Length)*100）; 
 

然后将进度设置为;

 backgroundWorker1.ReportProgress（m）; 

希望这会有所帮助，

Fredrik

I'm using a similar code:

private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            progressBar1.Value = e.ProgressPercentage;
        }

        private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            MessageBox.Show("Complete");
        }


        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {

            int[] arr = new int[21];
            for (int i = 1; i <= 20; i++)
            {
                arr[i] = i;
                Thread.Sleep(100);
                int m = (i/arr.Length)*100;
                backgroundWorker1.ReportProgress(i*m);
            }
        }

The progress bar isn't updating. But if I replace m by 5 the progress is seen. Please help.. In the original program I have to use the above approach. Thanks. :)

解决方案

Um...remember your integer math?

(integer, between 1 and 20 inclusive) / (integer, value 21) == 0

So...

int m = (i/arr.Length)*100;

Always gives m of zero.
Try this:

int m = (i * 100) / arr.Length;

Integer division is causing it;

int m = (i/arr.Length)*100;

i divided by arr.lenght will always be zero.

Change it to

int m = (int)((i/(double)arr.Length)*100);

And then set the progress to;

backgroundWorker1.ReportProgress(m);

Hope this helps,
Fredrik

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