Benim kod aşağıdaki gibidir

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)</param>
    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);
        }
    }

Al veri ızgara objUDMCountryStandards.Country = txtSearchCountry.Text.Trim() != string.Empty ? txtSearchCountry.Text : null; istisna atar "farklı bir iş sahibi çünkü iplik erişemiyor bu çağrılması." adım . yanlış olan nedir burada?

Bu insanlar başlarken ile ortak bir sorundur. Bir iş parçacığı ana iş parçacığı dışındaki UI öğeleri güncelleştirmek her zaman, her zaman kullanmak gerekir:

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

Ayrıca control.Dispatcher.CheckAccess() geçerli iş parçacığı kontrol sahibi olup olmadığını kontrol etmek için kullanabilirsiniz. Eğer kendi yaparsa, kodunuzu normal gibi görünüyor. Aksi takdirde, yukarıda desen kullanın.