如何在backgroundworker内部更改ListView?跨线程错误
本文关键字:ListView 线程 错误 backgroundworker 内部 | 更新日期: 2023-09-27 17:49:18
可能重复:
避免跨线程操作错误的最简洁和正确的方法?
我在运行程序时出错。。。。{"跨线程操作无效:控件'listView1'是从创建它的线程以外的线程访问的。"}
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) {
TestObject argumentTest = e.Argument as TestObject;
string[] lines = argumentTest.ThreeValue.Split(new string[] { Environment.NewLine }, StringSplitOptions.None);
HtmlAgilityPack.HtmlDocument document = new HtmlAgilityPack.HtmlDocument();
foreach (string vr in lines)
{
string country = argumentTest.OneValue.Trim();
string url = vr + country + '/code/' + argumentTest.TwoValue.Trim();
string sourceCode = WorkerClass.getSourceCode(url);
document.LoadHtml(sourceCode);
var title = document.DocumentNode.SelectSingleNode("//title");
var desc = document.DocumentNode.SelectSingleNode("//div[@class='productDescription']");
//-- eksekusi title
string isititle = title.InnerText;
string isititle2 = isititle.Replace("droidflashgame: ", "");
string isititle3 = Regex.Replace(isititle2, "[^A-Za-z0-9 ]+", "");
string isititle4 = isititle3.Substring(0, Math.Min(isititle3.Length, 120));
//-- Adding to list view for next step...
ListViewItem abg = new ListViewItem(isititle3);
abg.SubItems.Add(isititle4);
listView1.Items.Add(abg); // ERROR in Here?
我知道在一些教程中说使用invoke?但我尝试了很多东西,但还是错了?
有手吗?
试试这个。这对我来说很好
ListViewItem abg = new ListViewItem(isititle3);
if (listView1.InvokeRequired)
listView1.Invoke(new MethodInvoker(delegate
{
listView1.Items.Add(abg);
}));
else
listView1.Items.Add(abg);
删除最后一行(listView1.Items.Add(abg(;//这里有错误?(从您的代码中删除,并将其替换为:
AddListViewItem(abg);
然后用这种方法给你的代码:
delegate void AddListViewItemDelegate(ListViewItem abg);
void AddListViewItem(ListViewItem abg)
{
if (this.InvokeRequired)
{
AddListViewItemDelegate del = new AddListViewItemDelegate(AddListViewItem);
this.Invoke(del, new object() { abg });
}
else
{
listView1.Items.Add(abg);
}
}
这就可以完成任务了,亲爱的!
当您使用后台工作者时,您可以简单地通过更改的进度传递项目:
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
//..........
var test = new ListViewItem("test");
backgroundWorker1.ReportProgress(0, test);
}
private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
listView1.Items.Add((ListViewItem)e.UserState);
}