如何使用的WinForms进度条？ [英] How to use WinForms progress bar?

问题描述

我要显示的计算，这是在执行外部库的进度。

I want to show progress of calculations, which are performing in external library.

例如，如果我有一些计算方法，我想在我的Form类使用它为100000值我可以这样写：

For example if I have some calculate method, and I want to use it for 100000 values in my Form class I can write:

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

    private void Caluculate(int i)
    {
        double pow = Math.Pow(i, i);
    }

    private void button1_Click(object sender, EventArgs e)
    {
        progressBar1.Maximum = 100000;
        progressBar1.Step = 1;

        for(int j = 0; j < 100000; j++)
        {
            Caluculate(j);
            progressBar1.PerformStep();
        }
    }
}

我应该执行每次计算后一步。但如果我执行外部方法的所有计算100000。当我应该执行步骤如果我不想让这种方法依赖进度条？我可以，例如，写

I should perform step after each calculation. But what if I perform all 100000 calculations in external method. When should I "perform step" if I don't want to make this method dependant on progress bar? I can, for example, write

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

    private void CaluculateAll(System.Windows.Forms.ProgressBar progressBar)
    {
        progressBar.Maximum = 100000;
        progressBar.Step = 1;

        for(int j = 0; j < 100000; j++)
        {
            double pow = Math.Pow(j, j); //Calculation
            progressBar.PerformStep();
        }
    }

    private void button1_Click(object sender, EventArgs e)
    {
        CaluculateAll(progressBar1);
    }
}

但我不想做这样的。

but I don't want to do like that.

推荐答案

我建议你看看<一个href=\"http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.aspx\">BackgroundWorker.如果你有一个循环，在大的WinForm的它会阻止你的应用程序看起来像它已吊死。

I would suggest you have a look at BackgroundWorker. If you have a loop that large in your WinForm it will block and your app will look like it has hanged.

看 BackgroundWorker.ReportProgress（）来看看如何报告进度回UI线程。

Look at BackgroundWorker.ReportProgress() to see how to report progress back to the UI thread.

例如：

private void Calculate(int i)
{
    double pow = Math.Pow(i, i);
}

private void button1_Click(object sender, EventArgs e)
{
    progressBar1.Maximum = 100;
    progressBar1.Step = 1;
    progressBar1.Value = 0;
    backgroundWorker.RunWorkerAsync();
}

private void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
{
    var backgroundWorker = sender as BackgroundWorker;
    for (int j = 0; j < 100000; j++)
    {
        Calculate(j);
        backgroundWorker.ReportProgress((j * 100) / 100000);
    }
}

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

private void backgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
    // TODO: do something with final calculation.
}

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