从BackgroundWorker处理表单

Question

我有一个MainWindow(form1)和一个名为Module的类

在Module中,有一种方法可以创建一个新的Backgroundworker并在MainWindow中更改标签.我尝试在MainWindow代码中创建一个公共或内部方法,并在Module类中调用它,但它似乎不起作用.

任何人都可以帮我解决这个问题,这只是阻止我继续发展的事情.

对不起,如果我没有说清楚,如果你需要清理的东西让我知道.

Module.cs

public class Module
{
    protected System.Diagnostics.PerformanceCounter cpuCounter;
    BackgroundWorker cpuUThread;
    private delegate void UIDelegate();
    MainWindow mn;

    public void runCPUUsage()
    {

        cpuUThread = new BackgroundWorker();
        cpuUThread.DoWork += new DoWorkEventHandler(cpuUThread_DoWork);
        cpuUThread.WorkerSupportsCancellation = true;
        cpuUThread.RunWorkerAsync();
        mn = new MainWindow();
    }

    void cpuUThread_DoWork(object sender, DoWorkEventArgs e)
    {
        cpuCounter = new System.Diagnostics.PerformanceCounter();
        cpuCounter.CategoryName = "Processor";
        cpuCounter.CounterName = "% Processor Time";
        cpuCounter.InstanceName = "_Total";

        try
        {
            mn.changeCPUULabel(getCurrentCpuUsage().ToString());
        }
        catch (Exception ex)
        {

        }
    }

    public double getCurrentCpuUsage()
    {
        return Math.Round(cpuCounter.NextValue(), 0);
    }

    public void disposeCpuUsage()
    {
        cpuUThread.CancelAsync();
        cpuUThread.Dispose();
    }
}

MainWindow - 包含标签(labelCPUU)

internal void changeCPUULabel(string val)
    {
        Dispatcher.Invoke(new UIDelegate(delegate
            {
                this.labelCPUU.Content = val;
            }));
    }
public double getCurrentCpuUsage()
    {
       return mod.getCurrentCpuUsage();
    }
void activateCPUU(){ mod.runCPUUsage(); }

Answer 1

您是否尝试从与GUI线程不同的线程更改标签？你不能这样做.但是,您可以调用Invoke任何控件,并在GUI线程到达时执行它(当然,如果GUI线程处于空闲状态,则立即执行):

// Instead of:
myMainForm.MyLabel.Text = "New Text";

// Write:
myMainForm.Invoke(new Action(() => { myMainForm.MyLabel.Text = "New Text"; }));

Answer 2

如果必须使用后台工作程序更新UI,请使用该ReportProgress方法.这将触发您应该处理的事件.在那里实现您的UI更新逻辑.