后台工作者在c＃中冻结UI [英] Background Worker freezes UI in c#

问题描述

HI ..



我正在使用后台工作程序，但它仍在Windows应用程序中冻结UI。

HI..

I'm using background-worker but still it freeze UI in windows Application.

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
    try
    {
        Action DoCrossThreadUIWork = ()
        {
            CreateDataGridView();   // Method Create dataGridView and Handling Some GridView Events (e.g dataGridView1_Paint)

            DayScheduleTable = clsSqlQueries.ExecuteQuery(clsSqlQueries.GetDaySchedule); // Read Table From DataBase
            FillDataGridView();   // Fill DataGridView
        };
        this.BeginInvoke(DoCrossThreadUIWork);
    }
    catch (Exception ex)
    {
        clsWriteLog.GetInstance().WriteErrorLog(clsPublicMethod.GetInstance().GetMethodName(), ex.Message);
    }
}



private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
    progressBar1.Value = e.ProgressPercentage;
}

并在Form_load中调用后台工作者事件： br />

And Call background worker in Form_load Event As:

if (!backgroundWorker1.IsBusy)
                  backgroundWorker1.RunWorkerAsync()

如果有任何想法请分享..

If have any idea please share..

推荐答案

从一开始，我认为它悬挂的原因是因为你的进步bar可能是另一个线程所拥有的。像其他人所说，你可能想在这里重新考虑你的设计。



调用另一个线程所做的GUI元素更新的一种方法是创建一个调用者委托。以下代码说明了标签的更新方法，该标签旨在显示当前时间。



另外，个人偏好的问题是匿名线程就像松散的经典。它们非常适合执行一些非常简单的一次性操作。但如果要不断更新UI元素，我建议不要在这种情况下使用它们。

Right from the start, I think the reason it's hanging is because your progress bar is likely OWNED by another thread. Like others have stated, you might want to reconsider your design here.

A way to invoke updates to a GUI element made by another thread is to make an invoker delegate. The following code illustrates an update method to a label which is designed to display the current time.

Also, a matter of personal preference is that anonymous threads are like loose canons. They're great for executing some very simple, one-time operation. But if it's to continuously update a UI element, I'd advise against their use in this case.

private delegate void StatusCallbackString(string someText);
.
.
.

private void updateUITime(string time)
{
    if (lblTime.InvokeRequired)
    {
        StatusCallbackString sCB = new StatusCallbackString(updateUITime);
        this.BeginInvoke(sCB, new object[] { time });
        return;
    }

    lblTime.Text = time;
}

同时，在某个地方的后台线程......

Meanwhile, in a background thread somewhere...

private void MyThreadedOperation()
{
    while(keepThreadAlive)
    {
        updateUITime(DateTime.Now.ToString());

        .
        .
        // Sleep nicely for 1 second...
        System.Threading.CurrentThread.Join(1000);
    }
}

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