我创建了一个线程来在我的应用程序中执行某些功能，并在执行它时我想更新用户可见的应用程序主窗体中的标签。
我试图通过我调用usinag seprate线程的函数返回字符串数据，但它不起作用。
如果有任何解决方案在使用线程执行活动时更新标签文本，请告诉我。
class e2ertaData : e2erta1 { public void rsData() { network networkDetails = new network(); csv csvFile = new csv(); ftpFile ftpData = new ftpFile(); //Host Geo Data string getIP = networkDetails.GetIP(); string[] hostData = getIP.Split('~'); GeoIP geoIPReq = new GeoIP(); GeoIpData geoIPReqData = new GeoIpData(); geoIPReqData = geoIPReq.GetMy(); if (geoIPReqData.KeyValue["Error"].ToString() == "NO") { //Reading server names from XML file XmlDocument thisXmlDoc = new XmlDocument(); thisXmlDoc.LoadXml(ftpData.getConfigFile("server.xml")); XmlNodeList xnList = thisXmlDoc.SelectNodes("/servers/server"); //updating label in e2erta1 this.l1.Text = "daaaaaaaaaaa"; this.l1.Visible = true; this.l1.Refresh(); foreach (XmlNode xn in xnList) { string rtNote = ""; string requestedServer = xn["sname"].InnerText; string rtGet = networkDetails.GetRT(requestedServer); if (rtGet.Contains("Exception")) { rtNote = rtGet; //MessageBox.Show(rtNote); } try { var row = new List<string> { rtGet, rtNote }; ftpData.addToCSVFile(row); } catch (Exception c) { MessageBox.Show(c.ToString()); } } } else { MessageBox.Show("Geo data : " + geoIPReqData.KeyValue["Error"].ToString()); } //return null; } }谢谢，
函数naveed
I have created a thread to perform certain functionality in my application and while performing it I want to update the label in the main form of the application which is visible to user.
I tried to return the string data through the function which I am calling usinag seprate thread but it does not work.
Please let me know if there is any solution to update the label text while performing an activity using thread.
class e2ertaData : e2erta1 { public void rsData() { network networkDetails = new network(); csv csvFile = new csv(); ftpFile ftpData = new ftpFile(); //Host Geo Data string getIP = networkDetails.GetIP(); string[] hostData = getIP.Split('~'); GeoIP geoIPReq = new GeoIP(); GeoIpData geoIPReqData = new GeoIpData(); geoIPReqData = geoIPReq.GetMy(); if (geoIPReqData.KeyValue["Error"].ToString() == "NO") { //Reading server names from XML file XmlDocument thisXmlDoc = new XmlDocument(); thisXmlDoc.LoadXml(ftpData.getConfigFile("server.xml")); XmlNodeList xnList = thisXmlDoc.SelectNodes("/servers/server"); //updating label in e2erta1 this.l1.Text = "daaaaaaaaaaa"; this.l1.Visible = true; this.l1.Refresh(); foreach (XmlNode xn in xnList) { string rtNote = ""; string requestedServer = xn["sname"].InnerText; string rtGet = networkDetails.GetRT(requestedServer); if (rtGet.Contains("Exception")) { rtNote = rtGet; //MessageBox.Show(rtNote); } try { var row = new List<string> { rtGet, rtNote }; ftpData.addToCSVFile(row); } catch (Exception c) { MessageBox.Show(c.ToString()); } } } else { MessageBox.Show("Geo data : " + geoIPReqData.KeyValue["Error"].ToString()); } //return null; } }Thanks,
Naveed
最满意答案
还要考虑使用BackgroundWorker组件。
将BackgroundWorker从ToolBox拖到表单中 将backgroundworker的属性WorkerReportsProgress设置为true 订阅backgroundworker的活动DoWork 订阅backgroundworker的活动ProgressChanged内部DoWork事件处理程序运行您在线程中执行的所有操作，并调用ReportProgress方法将进度传递到表单：
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) { // reading server names from XML file for (int i = 0; i < xnList.Count; i++) { XmlNode xn = xnList[i]; // process node // report percentage to UI thread int percentProgress = (i+1)*100/xnList.Count; backgroundWorker1.ReportProgress(percentProgress); } }在ReportProgress事件处理程序内部，只需为label赋值：
private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e) { label1.Text = e.ProgressPercentage.ToString(); }要启动后台处理，请调用backgroundWorker1.RunWorkerAsync();
更新：您的代码不起作用，因为控件只能从创建它们的线程（UI线程）更新。 因此，您应该使用Invoke在UI线程上执行更新功能。 您可以在此处找到示例和说明。
Also consider using BackgroundWorker component.
Drag BackgroundWorker from ToolBox to your form Set backgroundworker's property WorkerReportsProgress to true Subscribe to backgroundworker's event DoWork Subscribe to backgroundworker's event ProgressChangedInside DoWork event handler run all what you do in your thread, and call ReportProgress method to pass progress to your form:
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) { // reading server names from XML file for (int i = 0; i < xnList.Count; i++) { XmlNode xn = xnList[i]; // process node // report percentage to UI thread int percentProgress = (i+1)*100/xnList.Count; backgroundWorker1.ReportProgress(percentProgress); } }Inside ReportProgress event handler simply assign value to label:
private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e) { label1.Text = e.ProgressPercentage.ToString(); }To start background processing call backgroundWorker1.RunWorkerAsync();
UPDATE: Your code is not working, because controls could be updated only from thread which created them (UI thread). So you should use Invoke to execute update functionality on UI thread. Example and description you can find here.
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