调用线程不能访问这个对象，因为它属于另一个线程

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);
    }
}

该步骤遵循judmcountrystandards。Country = txtSearchCountry.Text.Trim() !=字符串。空的吗?txtSearchCountry。文本:null;在获取网格数据时抛出异常

调用线程不能访问此对象，因为有不同的线程拥有它。

这里出了什么问题?

当前回答

当我添加级联组合框到我的WPF应用程序时，我一直得到错误，并通过使用这个API解决了这个错误:

    using System.Windows.Data;

    private readonly object _lock = new object();
    private CustomObservableCollection<string> _myUiBoundProperty;
    public CustomObservableCollection<string> MyUiBoundProperty
    {
        get { return _myUiBoundProperty; }
        set
        {
            if (value == _myUiBoundProperty) return;
            _myUiBoundProperty = value;
            NotifyPropertyChanged(nameof(MyUiBoundProperty));
        }
    }

    public MyViewModelCtor(INavigationService navigationService) 
    {
       // Other code...
       BindingOperations.EnableCollectionSynchronization(AvailableDefectSubCategories, _lock );

    }

详情请见https://msdn.microsoft.com/query/dev14.query?appId=Dev14IDEF1&l=EN-US&k=k(System.Windows.Data.BindingOperations.EnableCollectionSynchronization);k(TargetFrameworkMoniker-.NETFramework,Version%3Dv4.7);k(DevLang-csharp)&rd=true

2018-06-15 19:00:40

其他回答

这是人们刚开始时遇到的一个普遍问题。每当你从主线程以外的线程更新UI元素时，你需要使用:

this.Dispatcher.Invoke(() =>
{
    ...// your code here.
});

你也可以使用control. dispatcher . checkaccess()来检查当前线程是否拥有该控件。如果它确实拥有它，那么您的代码看起来就正常。否则，使用上述图案。

2012-03-16 06:22:58

这发生在我身上，因为我试图在另一个线程而不是UI线程中访问UI组件

像这样

private void button_Click(object sender, RoutedEventArgs e)
{
    new Thread(SyncProcces).Start();
}

private void SyncProcces()
{
    string val1 = null, val2 = null;
    //here is the problem 
    val1 = textBox1.Text;//access UI in another thread
    val2 = textBox2.Text;//access UI in another thread
    localStore = new LocalStore(val1);
    remoteStore = new RemoteStore(val2);
}

为了解决这个问题，将任何ui调用包装在Candide上面提到的答案中

private void SyncProcces()
{
    string val1 = null, val2 = null;
    this.Dispatcher.Invoke((Action)(() =>
    {//this refer to form in WPF application 
        val1 = textBox.Text;
        val2 = textBox_Copy.Text;
    }));
    localStore = new LocalStore(val1);
    remoteStore = new RemoteStore(val2 );
}

2016-06-27 07:59:41

另外，另一个解决方案是确保控件是在UI线程中创建的，而不是由后台工作线程创建的。

2017-02-23 08:27:08

出于某种原因，坎迪德的回答并不可信。尽管如此，它还是很有帮助的，因为它让我发现了这个，它非常有效:

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

2015-07-12 10:44:12

如果你遇到这个问题，并且UI控件是在WPF中使用BitmapSource或ImageSource时在单独的工作线程上创建的，在将BitmapSource或ImageSource作为参数传递给任何方法之前，首先调用Freeze()方法。使用Application.Current.Dispatcher.Invoke()在这样的实例中不起作用

2015-11-25 12:59:13

调用线程不能访问这个对象，因为它属于另一个线程

推荐文章

最新文章

标签