我有一个在C#中使用WinForms制作的程序，它使用的是另一个开发人员提供的API，它必须在主线程中运行（因为它使用的是WM#消息，但可能还有其他原因），所以我不能使用BackgroundWorker。我的程序使用该API至少运行15分钟。因此，当我运行它并单击表单时，它将冻结并崩溃，因为它没有响应。我可以做些什么使表单响应，并且在使用该API时不触发Windows警报“应用程序未响应”？
以下是我在循环中为给定文件夹中的所有文件名运行的代码：
fApi.ApiSetDates(DateTime.MinValue, DateTime.MinValue, invoiceIssueDate.Year, invoiceIssueDate.Month);
try
{
if (fApi.ImportFakturFromXML(fileName) != 0)
{
throw new Exception(fApi.GetLastError());
}
File.Delete(fileName);
}
catch (Exception x)
{
MessageBox.Show(x.ToString());
}
下面是一个小Windows窗体的非设计器生成的代码，当单击它的单独按钮时，它在一个循环中执行许多长时间运行的UI线程阻塞操作。这段代码比我最初在评论中建议的计时器更具可读性和可维护性，并且比d.Kastier在他的答案评论中建议的要简单一些。
namespace LongRunningLoop
{
public partial class Form1 : Form
{
private bool m_Closed = false;
public Form1()
{
InitializeComponent(); // set up button1
}
// async void event handler. Usually async void
// is a no-no, but here we really do want to fire and forget.
// We prevent nasty things from happening by disabling the UI
// before starting the main work and exiting if we detect
// that the form has been closed.
private async void button1_Click(object sender, EventArgs e)
{
// Disable the UI so there's no reentrancy during the Task.Delay()
button1.Enabled = false;
for (int i = 0; i < 60; i++)
{
if (m_Closed)
{
// Don't keep doing work if the user has closed the form
break;
}
Thread.Sleep(5000); // A long-running, blocking call (sleep thread for 5 seconds)
await Task.Delay(100); // Yield to allow other events to be processed
}
// Re-enable the UI
button1.Enabled = true;
}
private void Form1_FormClosed(object sender, FormClosedEventArgs e)
{
// Set a flag to signal the loop to exit
m_Closed = true;
}
}
}
我要展示我通常做的事。
您将需要对UI控件的引用，然后在Thread或WG中运行您的代码。
private static void RunOnUiThread(Control c, Action action)
{
c.Invoke(new MethodInvoker(action));
}
private void ExecuteMyFunction()
{
Task.Run(() =>
{
// run code in background...
// run code in Main Thread (UI)
// anyControl is a `Control` or a `Form`
RunOnUiThread(anyControl, () => { /* code to run on mainthread */ });
// run more code in background...
}
}
