调用线程无法访问该对象，因为其他线程拥有它

本文翻译自：The calling thread cannot access this object because a different thread owns it

My code is as below 我的代码如下

public CountryStandards()
{
    InitializeComponent();
    try
    {
        FillPageControls();
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message, "Country Standards", MessageBoxButton.OK, MessageBoxImage.Error);
    }
}

/// <summary>
/// Fills the page controls.
/// </summary>
private void FillPageControls()
{
    popUpProgressBar.IsOpen = true;
    lblProgress.Content = "Loading. Please wait...";
    progress.IsIndeterminate = true;
    worker = new BackgroundWorker();
    worker.DoWork += new System.ComponentModel.DoWorkEventHandler(worker_DoWork);
    worker.ProgressChanged += new System.ComponentModel.ProgressChangedEventHandler(worker_ProgressChanged);
    worker.WorkerReportsProgress = true;
    worker.WorkerSupportsCancellation = true;
    worker.RunWorkerCompleted += new System.ComponentModel.RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);
    worker.RunWorkerAsync();                    
}

private void worker_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)
{
    GetGridData(null, 0); // filling grid
}

private void worker_ProgressChanged(object sender, System.ComponentModel.ProgressChangedEventArgs e)
{
    progress.Value = e.ProgressPercentage;
}

private void worker_RunWorkerCompleted(object sender, System.ComponentModel.RunWorkerCompletedEventArgs e)
{
    worker = null;
    popUpProgressBar.IsOpen = false;
    //filling Region dropdown
    Standards.UDMCountryStandards objUDMCountryStandards = new Standards.UDMCountryStandards();
    objUDMCountryStandards.Operation = "SELECT_REGION";
    DataSet dsRegionStandards = objStandardsBusinessLayer.GetCountryStandards(objUDMCountryStandards);
    if (!StandardsDefault.IsNullOrEmptyDataTable(dsRegionStandards, 0))
        StandardsDefault.FillComboBox(cmbRegion, dsRegionStandards.Tables[0], "Region", "RegionId");

    //filling Currency dropdown
    objUDMCountryStandards = new Standards.UDMCountryStandards();
    objUDMCountryStandards.Operation = "SELECT_CURRENCY";
    DataSet dsCurrencyStandards = objStandardsBusinessLayer.GetCountryStandards(objUDMCountryStandards);
    if (!StandardsDefault.IsNullOrEmptyDataTable(dsCurrencyStandards, 0))
        StandardsDefault.FillComboBox(cmbCurrency, dsCurrencyStandards.Tables[0], "CurrencyName", "CurrencyId");

    if (Users.UserRole != "Admin")
        btnSave.IsEnabled = false;

}

/// <summary>
/// Gets the grid data.
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="pageIndex">Index of the page.( used in case of paging)   </pamam>
private void GetGridData(object sender, int pageIndex)
{
    Standards.UDMCountryStandards objUDMCountryStandards = new Standards.UDMCountryStandards();
    objUDMCountryStandards.Operation = "SELECT";
    objUDMCountryStandards.Country = txtSearchCountry.Text.Trim() != string.Empty ? txtSearchCountry.Text : null;
    DataSet dsCountryStandards = objStandardsBusinessLayer.GetCountryStandards(objUDMCountryStandards);
    if (!StandardsDefault.IsNullOrEmptyDataTable(dsCountryStandards, 0) && (chkbxMarketsSearch.IsChecked == true || chkbxBudgetsSearch.IsChecked == true || chkbxProgramsSearch.IsChecked == true))
    {
        DataTable objDataTable = StandardsDefault.FilterDatatableForModules(dsCountryStandards.Tables[0], "Country", chkbxMarketsSearch, chkbxBudgetsSearch, chkbxProgramsSearch);
        dgCountryList.ItemsSource = objDataTable.DefaultView;
    }
    else
    {
        MessageBox.Show("No Records Found", "Country Standards", MessageBoxButton.OK, MessageBoxImage.Information);
        btnClear_Click(null, null);
    }
}

The step objUDMCountryStandards.Country = txtSearchCountry.Text.Trim() != string.Empty ? txtSearchCountry.Text : null; 步骤objUDMCountryStandards.Country = txtSearchCountry.Text.Trim() != string.Empty ? txtSearchCountry.Text : null; objUDMCountryStandards.Country = txtSearchCountry.Text.Trim() != string.Empty ? txtSearchCountry.Text : null; in get grid data throws exception 在获取网格数据时抛出异常

The calling thread cannot access this object because a different thread owns it. 调用线程无法访问该对象，因为其他线程拥有它。

What's wrong here? 怎么了

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#1楼

参考：https://stackoom.com/question/epvB/调用线程无法访问该对象-因为其他线程拥有它

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#2楼

您需要更新到用户界面，因此请使用

Dispatcher.BeginInvoke(new Action(() => {GetGridData(null, 0)})); 

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#3楼

Another good use for Dispatcher.Invoke is for immediately updating the UI in a function that performs other tasks: Dispatcher.Invoke另一个好用法是立即执行执行其他任务的功能中的UI：

// Force WPF to render UI changes immediately with this magic line of code...
Dispatcher.Invoke(new Action(() => { }), DispatcherPriority.ContextIdle);

I use this to update button text to " Processing... " and disable it while making WebClient requests. 我使用它来将按钮文本更新为“正在处理... ”，并在发出WebClient请求时将其禁用。

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#4楼

For some reason Candide's answer didn't build. 由于某种原因，Candide的答案没有建立。 It was helpful, though, as it led me to find this, which worked perfectly: 但是，这很有帮助，因为它使我找到了这个，它非常有效：

System.Windows.Threading.Dispatcher.CurrentDispatcher.Invoke((Action)(() =>
    {
       //your code here...
    }));

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#5楼

To add my 2 cents, the exception can occur even if you call your code through System.Windows.Threading.Dispatcher.CurrentDispatcher.Invoke() . 要加2美分，即使您通过System.Windows.Threading.Dispatcher.CurrentDispatcher.Invoke()调用代码，也会发生异常。
The point is that you have to call Invoke() of the Dispatcher of the control that you're trying to access , which in some cases may not be the same as System.Windows.Threading.Dispatcher.CurrentDispatcher . 关键是您必须Invoke() 要访问的控件的Dispatcher的Invoke() ，在某些情况下，它可能与System.Windows.Threading.Dispatcher.CurrentDispatcher 。 So instead you should use YourControl.Dispatcher.Invoke() to be safe. 因此，相反，您应该使用YourControl.Dispatcher.Invoke()是安全的。 I was banging my head for a couple of hours before I realized this. 在意识到这一点之前，我敲了几个小时。

Update 更新资料

For future readers, it looks like this has changed in the newer versions of .NET (4.0 and above). 对于未来的读者来说，.NET的新版本（4.0及更高版本）似乎已发生了变化。 Now you no longer have to worry about the correct dispatcher when updating UI-backing properties in your VM. 现在，在更新VM中的UI支持属性时，您不再需要担心正确的调度程序。 WPF engine will marshal cross-thread calls on the correct UI thread. WPF引擎将在正确的UI线程上封送跨线程调用。 See more details here . 在这里查看更多详细信息。 Thanks to @aaronburro for the info and link. 感谢@aaronburro提供的信息和链接。 You may also want to read our conversation below in comments. 您可能还想阅读下面的评论我们的对话。

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#6楼

If you encounter this problem and UI Controls were created on a separate worker thread when working with BitmapSource or ImageSource in WPF, call Freeze() method first before passing the BitmapSource or ImageSource as a parameter to any method. 如果您遇到此问题，并且在WPF中使用BitmapSource或ImageSource在单独的工作线程上创建了UI控件，请先调用Freeze()方法，然后再将BitmapSource或ImageSource作为参数传递给任何方法。 Using Application.Current.Dispatcher.Invoke() does not work in such instances 在这种情况下，无法使用Application.Current.Dispatcher.Invoke()