Question

I have Datagrid and Text Box in my Form. Datagrid is showing me existing items in my stock. I use Text Box to search and set focus to that row which is matching with my Text Box. Now it is working fine when VirtualizingStackPanel.IsVirtualizing=”false” but it is very slow and getting a lot RAM resource.
Here is my code for this.

public IEnumerable<Microsoft.Windows.Controls.DataGridRow> GetDataGridRows(Microsoft.Windows.Controls.DataGrid grid)
        {
            var itemsSource = grid.ItemsSource as IEnumerable;
            if (null == itemsSource) yield return null;
            foreach (var item in itemsSource)
            {
                var row = grid.ItemContainerGenerator.ContainerFromItem(item) as Microsoft.Windows.Controls.DataGridRow;
                if (null != row) yield return row;
            }
        }


        private void SearchBoxDataGrid_TextChanged(object sender, TextChangedEventArgs e)
        {
            var row = GetDataGridRows(AssortDataGrid);
            /// go through each row in the datagrid
            foreach (Microsoft.Windows.Controls.DataGridRow r in row)
            {
                DataRowView rv = (DataRowView)r.Item;
                // Get the state of what's in column 1 of the current row (in my case a string)
                string t = rv.Row["Ассортимент"].ToString().ToLower();
                if (t.StartsWith(SearchBoxDataGrid.Text.ToLower()))
                {
                    AssortDataGrid.SelectedIndex = r.GetIndex();
                    AssortDataGrid.ScrollIntoView(AssortDataGrid.SelectedItem);
                    break;
                }

            }
        }

What I want is to make it VirtualizingStackPanel.IsVirtualizing=”true” but in this case my method is not working. I know why it is not working, my code will work only for showing part of Datagrid.
What do you recommend? How to fix this issue? Any idea will be appreciated. If you give any working code it will be fantastic. I hope I could explain my problem.

Answer 1

I did a little coding and make it work. If anyone needs it in future please, use it.
Firstly I am creating List of Products

List<string> ProductList;

Then on Load Method I list all my products to my Product List.

    SqlCommand commProc2 = new SqlCommand("SELECT dbo.fGetProductNameFromId(ProductID) as ProductName from Assortment order by ProductName desc", MainWindow.conn);
    string str2;
    SqlDataReader dr2 = commProc2.ExecuteReader();
    ProductList = new List<string>();
    try
    {
        if (dr2.HasRows)
        {
            while (dr2.Read())
            {
                str2 = (string)dr2["ProductName"];
                ProductList.Insert(0, str2.ToLower ());
            }
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show("An error occured while trying to fetch data\n" + ex.Message);
    }

    dr2.Close();
    dr2.Dispose(); 

After that I did some changes in SearchBoxDataGrid_TextChanged

    private void SearchBoxDataGrid_TextChanged(object sender, TextChangedEventArgs e)
    {

        int pos = 0;
        string typedString = SearchBoxDataGrid.Text.ToLower();
        foreach (string item in ProductList)
        {
            if (!string.IsNullOrEmpty(SearchBoxDataGrid.Text))
            {
                if (item.StartsWith(typedString))
                {
                    pos = ProductList.IndexOf(item);
                    AssortDataGrid.SelectedIndex = pos;
                    AssortDataGrid.ScrollIntoView(AssortDataGrid.SelectedItem);
                    break;
                }
            }
        }

    }

Now it works when VirtualizingStackPanel.IsVirtualizing=”true”.
That is all.