从另一个 class 访问后台工作者

Question

我在 Windows 表单应用程序中将逻辑从一个 class 分离到另一个。当全部合而为一 class 时，它工作正常，但我现在将逻辑移至它自己的 classes。从另一个 class.

获取 backgroundWorker 时遇到一些问题

我在class一个

public partial class ClassA : Form
    BackgroundWorker essentialBgWorker = new BackgroundWorker();

    public ClassA()
        {
            InitializeComponent();
            //essentialBgWorker
            essentialBgWorker.DoWork += new DoWorkEventHandler(essentialBgWorker_DoWork);
            essentialBgWorker.ProgressChanged += new ProgressChangedEventHandler(essentialBgWorker_ProgressChanged);
            essentialBgWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(essentialBgWorker_RunWorkerCompleted);
            essentialBgWorker.WorkerReportsProgress = true;
        }

这是一个带有按钮的表单，单击该按钮会将文件复制到另一个目录。

private void copyButton_Click(object sender, EventArgs e)
{
    clickedButton = ((Button)sender).Name.ToString();
    itemsChanged = ((Button)sender).Text.ToString();
    essentialBgWorker.RunWorkerAsync();
}

这将运行后台工作程序：

public void essentialBgWorker_DoWork(object sender, DoWorkEventArgs e)
{
    string buttonSender = clickedButton; //copyButton, deleteButton, etc.
    switch (buttonSender)
    {
        case "copyButton":
            //this is pseudocode - the important part being that this is where I would call the method from the other class
            ClassB.copyDocuments();
            break;
        case "deleteButton":
            //this is pseudocode - the important part being that this is where I would call the method from the other class
            ClassB.deleteDocuments();
            break;
        default:
            essentialBgWorker.CancelAsync();
            break;
    }
}

在我的另一个 class (ClassB) 中，对于此示例，我有单击按钮时调用的方法（应该处理逻辑）。

public void copyDocuments()
{
    ClassA classA = new ClassA();
    //
    //the logic that handles copying the files
    //gets the filecount!

    //Report to the background worker
    int totalFileCount = fileCount;
    int total = totalFileCount; //total things being transferred
    for (int i = 0; i <= total; i++) //report those numbers
    {
        System.Threading.Thread.Sleep(100);
        int percents = (i * 100) / total;
        classA.essentialBgWorker.ReportProgress(percents, i);

        //2 arguments:
        //1. procenteges (from 0 t0 100) - i do a calcumation 
        //2. some current value!
    }
    //Do the copying here
}

这一行我一直有问题：

classA.essentialBgWorker.ReportProgress(percents, i);

这条线在在 ClassA 时有效 - 但一旦将其引入 ClassB 就会出现错误：

ClassA.essentialBgWorker' is inaccessible due to it's protection level

只是寻求一些帮助，以正确的方式让它从另一个 class 开火。

Answer 1

您必须向 essentialBgWorker 添加 public 修饰符

public BackgroundWorker essentialBgWorker = new BackgroundWorker();

从另一个 class 访问后台工作者

Access background worker from a different class

c#

backgroundworker

visual-studio-2015