Question

public partial class JobDataDuplicatorForm : Form
{
    public JobDataDuplicatorForm(IJobDataDuplicatorEngine engine)
    {
        _engine.CopyStartedEvent += GetEventHandler(OnCopyStarted);
        _engine.CopyEndedEvent += GetEventHandler(OnCopyEnded);
        ...
    }

    private static EventHandler GetEventHandler(Action action)
    {
        return (sender, args) => action();
    }

    private void OnCopyStarted()
    {
        copyStatus.Text = "Copy progress: ";
        generateButton.Enabled = false; // Cross-thread operation not valid
    }
}

我有以下例外：

Additional information: Cross-thread operation not valid: Control 
'generateButton' accessed from a thread other than the thread it was created on.

我是否可以通过更改GetEventHandler()来修复异常，而不是将每个按钮包装在不同的位置，例如

Invoke((MethodInvoker)delegate { generateButton.Enabled = false; });？

我该怎么做？

Answer 1

根据您的评论，您说您从后台主题调用JobDataDuplicatorForm(IJobDataDuplicatorEngine engine)。

您的类是Form，任何Windows控件（包括Form）都必须首先在UI线程上创建，或者Invoke和InvokeRequired之类的内容。无论调用什么代码，JobDataDuplicatorForm的构造函数都必须从UI线程进行调用。

如何创建线程安全的GetEventHandler（）？

1 个答案: