报告从不同的类C＃进度的BackgroundWorker [英] report progress backgroundworker from different class c#

问题描述

在我的.NET的C＃项目我已经使用了BackgroundWorker的来调用不同的类中的方法。以下是我的主要形式的源 - code

In my .net c# project i have used a "backgroundworker" to call a method in a different class. following is the source-code of my main form

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        testClass t1 = new testClass();
        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            t1.changevalue(1000);
        }

        private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            label1.Text += Convert.ToString(e.ProgressPercentage);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            backgroundWorker1.RunWorkerAsync();
        }
    }

和有在我的项目命名为testClass.cs一个单独的类文件中的以下code。我想报告的进展从这个类BackgroundWorker的，这样我就能够显示来自lable1在主要进度。

and have the following code in a separate class file named "testClass.cs" in my project. I want to report the progress to the backgroundworker from this class, so that i will be able to display the progress in the main from lable1.

class testClass
    {
        private int val;
        public int changevalue(int i)
        {
            for (int j = 0; j < 1000; j++)
            {
                val += i + j;
                //from here i need to preport the backgroundworker progress
                //eg; backgroundworker1.reportProgress(j);
            }
            return val;
        }
    } 

但我不能从TestClass的访问的BackgroundWorker。所以有人可以请告诉如何克服这个问题？

but I am not allowed to access backgroundworker from the "testClass". so can someone please tell how to overcome this problem?

p.s-我已经找到<一个href=\"http://stackoverflow.com/questions/3289920/c-sharp-how-to-report-progress-from-within-a-class-to-a-backgroundworker\">this解决方案，但我不明白。

p.s- I have found this solution, but i don't understand it.

推荐答案

您可以只通过它作为一个变量

You could just pass it in as a variable

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
    t1.changevalue(1000, sender as BackgroundWorker);
}


class testClass
{
    private int val;
    public int changevalue(int i, BackgroundWorker bw)
    {
        for (int j = 0; j < 1000; j++)
        {
            val += i + j;
            bw.ReportProgress(i);
            //from here i need to preport the backgroundworker progress
            //eg; backgroundworker1.reportProgress(j);
        }
        return val;
    }
} 

但是我认为最好的办法是一个事件在的TestClass 的你的表格可分配给

But I think the best option would be an event in the testClass that your Form can assign to.

public partial class Form1 : Form
{
    private BackgroundWorker backgroundWorker1;
    private testClass t1 = new testClass();

    public Form1()
    {
        InitializeComponent();

        // subscribe to your event
        t1.OnProgressUpdate += t1_OnProgressUpdate;
    }

    private void t1_OnProgressUpdate(int value)
    {
        // Its another thread so invoke back to UI thread
        base.Invoke((Action)delegate
        {
            label1.Text += Convert.ToString(value);
        });
    }

    private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
    {
        t1.changevalue(1000);
    }

    private void button1_Click_1(object sender, EventArgs e)
    {
        backgroundWorker1.RunWorkerAsync();
    }

}

class testClass
{
    public delegate void ProgressUpdate(int value);
    public event ProgressUpdate OnProgressUpdate;

    private int val;
    public int changevalue(int i)
    {
        for (int j = 0; j < 1000; j++)
        {
            val += i + j;

            // Fire the event
            if (OnProgressUpdate != null)
            {
                OnProgressUpdate(i);
            }
        }
        return val;
    }
} 

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