[英]BackgrounderWorker stopping in try-catch block
//static int var1, var2, var3;
//static List<string> list;
public static void MyMethod(Object obj, int times)
{
List = doc1.Descendants("Order")
.Select(d => d.Value)
.ToList();
for (int i = 0; i < List.Count; i++)
{
try
{
var item = (from m in doc1.Elements("list").Elements("Order")
where m.Value == List[i]
select m);
item.Remove();
doc1.Save(path1);
var1 = doc1.Root.Descendants("Order").Count();
//DoSomethingHeavy with List[i]
doc2.Element("list2").Add(new XElement("Order", List[i]));
doc2.Save(path2);
var2= doc2.Root.Descendants("Order").Count();
}
catch (Exception)
{
doc3.Element("list3").Add(new XElement("Order", List[i]));
doc3.Save(path3);
var3 = doc3.Root.Descendants("Order").Count();
}
}
}
這是公共靜態類中的MyMethod。 我想使其在BackgroundWorker下的表單中運行,以便能夠暫停和繼續執行。
我正在使用此類:
public class BackgroundLoading
{
public BackgroundWorker Bw;
public delegate void RunFunction();
public RunFunction thisFunction;
public BackgroundLoading(RunFunction newFunction)
{
thisFunction = newFunction;
Bw = new BackgroundWorker();
Bw.DoWork += new DoWorkEventHandler(Bw_DoWork);
Bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(Bw_RunWorkerCompleted);
}
public void Start()
{
Bw.RunWorkerAsync();
}
void Bw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
if (e.Error != null)
{
//an error occured
MessageBox.Show("an error occured: " + e.Error.Message);
}
if (e.Cancelled)
{
//an error occured
MessageBox.Show("Job cancelled");
}
else
{
MessageBox.Show("Job completed");
}
}
void Bw_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
MessageBox.Show(" *");
}
void Bw_DoWork(object sender, DoWorkEventArgs e)
{
if (thisFunction != null)
thisFunction();
}
}
//class to implement
然后,在myForm中:
private void button1_Click(object sender, EventArgs e)
{
BackgroundLoading bl = new BackgroundLoading(MyMethod());
bl.Start();
}
我真的是BackgroundWorker的新手,可能我沒有以正確的方式使用它。 單擊StopExecution按鈕時,並未保存我的所有文檔(doc1,doc2,doc3)。 因此,如何避免停止在try-catch塊中?
在您的DoWork()方法中,進行檢查以查看是否有取消中的取消 ,如果有,請完成您的處理。
void Bw_DoWork(object sender, DoWorkEventArgs e) { //in your loop test every time Cancel flag for (int i = 0; i < MyMethodGetItemcount(); i++) { MyMethod(i);//item by item if(yourbackgroundworker.CancellationPending) { e.Cancel = true; return; } }
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