[英]C# Properly raise event from background thread and handle it in the UI thread
我一直在網上尋找這樣的例子:
https://msdn.microsoft.com/en-us/library/edzehd2t%28v=vs.110%29.aspx
和整個stackoverflow,但我無法讓它工作或找到答案。 或者答案不適用於我正在做的事情,或者答案中沒有足夠的信息讓我了解如何進行這項工作。
我試圖在這里編寫好的代碼並避免 Application.DoEvents()。 看一下代碼。
private void btnSendQ_Click(object sender, EventArgs e)
{
//launch a thread from a button click event
Thread ManualQueryThread = new Thread(StartManualQueryThread_Thread);
ManualQueryThread.Priority = ThreadPriority.Normal;
ManualQueryThread.IsBackground = true;
Platform.Log(LogLevel.Debug, "Starting Manual Query Thread.");
Stats.g_CurrentStatus = "Starting Manual Query Thread.";
ManualQueryThread.Start();
}
private void StartManualQueryThread_Thread()
{
try
{
//Here work is performed in the background thread populating objects with data.
}
catch (Exception e)
{
Platform.Log(LogLevel.Error, "Error in StartManualQueryThread(). The error is: " + e.ToString());
}
finally
{
//raise event here since the thread has completed
OnC_FindComplete(EventArgs.Empty);
}
}
public event EventHandler C_FindComplete;
protected virtual void OnC_FindComplete(EventArgs e)
{
//display the gathered information in a datagrid using DisplayC_FindResults(), and enable UI objects.
EventHandler handler = C_FindComplete;
DisplayC_FindResults();
btnSendQ.Enabled = true;
btnMove.Enabled = true;
}
問題是當創建發布版本時,數據網格會收到空引用異常並執行紅色 X 操作,因為它仍在由后台線程更新。 那么如何在后台線程中正確引發事件,並在 UI 線程中處理該事件以與 UI 交互呢?
嘗試使用BackgroundWorker 。 您將能夠在RunWorkerCompleted
事件中更新您的 UI。
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