如何在for循环中显示连续变化的值 [英] How do I display continuous changing values inside a for loop

问题描述

我遇到以下问题：

在下面的代码中，我想在文本框中连续显示外部循环编号（带下划线）。但它不是连续显示，它只在循环结束时显示计数。





for（int i = 0; i < noOfSim; i ++）

{

textBox1.Text =（i + 1）.ToString（）;



for（int j = 0; j< lstSimulData.Count; j ++）

{

int pRand = Possion_Rand（lstSimulData [ j] .Lambda）;

double lRand = LogNorm_Rand（lstSimulData [j] .Mu，lstSimulData [j] .Sigma，pRand）;

arrLossamts [j，i] = lRand;

}

}



我将非常感谢任何帮助/指针。

I am facing the following problem :
In the following code,i want to continuously display the outer loop number in a text box (underlined). But it is not displaying continuously, it displays the count only at the end of loop.


for (int i = 0; i < noOfSim; i++)
{
textBox1.Text = (i + 1).ToString();

for (int j = 0; j < lstSimulData.Count; j++)
{
int pRand = Possion_Rand(lstSimulData[j].Lambda);
double lRand = LogNorm_Rand(lstSimulData[j].Mu,lstSimulData[j].Sigma,pRand);
arrLossamts[j, i] = lRand;
}
}

I will be highly grateful for any help/pointers.

推荐答案

这是因为实际运行循环的线程和更新UI的线程是唯一的线程。



你必须在一个单独的线程上运行循环，并设置一个委托，以便能够从它更新UI线程。



最好的方法是使用一个BackgroundWor KER。这样：

That is because the thread actually running the loop and the thread updating the UI are the same only thread.

You have to run the loop on a separate thread, and setup a delegate to be able to update the UI thread from it.

Best way would be to use a BackgroundWorker. This way:

public partial class Form1 : Form
{
   public Form1() {
      InitializeComponent();
      BackgroundWorker bw = new BackgroundWorker();
      bw.DoWork += Run;
      bw.RunWorkerAsync();
   }

   void Run(object sender, DoWorkEventArgs e) {
      for (int i = 0; i < noOfSim; i++) {
         Update(i + 1);
         for (int j = 0; j < lstSimulData.Count; j++) {
            // ...
         }
      }
   }

   public delegate void IntConsumerControl(Control control, int value);

   public void SetText(Control control, int value) {
      if (control.InvokeRequired) {
         control.Invoke(new IntConsumerControl(SetText), new object[] { control, value });
      } else {
         control.Text = value.ToString();
      }
   }

   void Update(int value) {
      SetText(textBox1, value);
   }
}

还有其他方法，但这个方法有效。

希望这会有所帮助。

There are other ways, but this one works.
Hope this helps.

这是正确的，现代计算机对于这样一个平凡的循环来说太快了。您可以使用计时器来控制速度，如下所示：

That is correct, the modern computer is too fast for such a mundane loop. You can use a timer to control the pace, like this:

using System;
using System.Windows.Forms;

namespace WindowsFormsApplicationCS
{
    public partial class Form17 : Form
    {
        Timer timer = new Timer();
        int i;

        public Form17()
        {
            InitializeComponent();
            i = 0;
            timer.Tick += new EventHandler(timerTick); // register a timer event
            timer.Interval = 500;              // Timer will tick every half a second
            timer.Enabled = true;              // Enable the timer
            timer.Start();                     // Start
        }

        private void timerTick(object sender, EventArgs e)
        {
            if (i < 10)
            {
                i++;
                textBox1.Text = i.ToString();
            }
            else
            {
                timer.Stop();
            }
        }
    }
}

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