在 UserControl 按钮单击事件中从父 Window 调用公共 void 方法

Question

I have a label in my MainWindow navigation menu, and the content is binding to SQL command and that method is called public void HBD_Count()

I have various UserControls where on a Button_Click I would like to call public void HBD_Count() so that value in my label can be refreshed.

I tried called the public partial class from my MainWindow to my UserControl pages but it does not work.

Here is my code in my Main Window, which populates the label :

    public partial class MainWindow : Window
{

    public MainWindow()
    {
        InitializeComponent();
        Loaded += MyWindow_Loaded;
        HBD_Count();
    }


        public void HBD_Count()
    {
        try
        {
            SqlConnection connection = new SqlConnection("Data Source=WINDOWS-B1AT5HC\\SQLEXPRESS;Initial Catalog=CustomerRelations;Integrated Security=True;");

            string selectQuery = ("SELECT COUNT(*) AS HBDCount FROM hb_Disputes WHERE (ASSGNTO = 'E099255') AND (STATUS = 3)");
            connection.Open();
            SqlCommand command = new SqlCommand(selectQuery, connection);

            SqlDataReader sqlReader = command.ExecuteReader();

            while (sqlReader.Read())
            {
                HBD_Counts.Content = sqlReader["HBDCount"].ToString();
            }
            connection.Close();
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.ToString());
        }

    }

Here is my code in my UserControl page:

    public partial class Import_HighBill : UserControl
{
    public string ValueString { get; set; }
    public partial class MainWindow : Window { }

    public Import_HighBill()
    {
        InitializeComponent();
        AssignList();
    }
        private void butn_Assign_Click(object sender, RoutedEventArgs e)
    {
            SqlConnection con = new SqlConnection("Data Source=WINDOWS-B1AT5HC\\SQLEXPRESS;Initial Catalog=CustomerRelations;Integrated Security=True;");

            try
            {
                SqlCommand cmd = new SqlCommand("UPDATE [hb_Disputes] SET ASSGNTO=@ASSGNTO WHERE DSP_ID=@DSP_ID", con);
                cmd.Parameters.AddWithValue("@DSP_ID", txt_ID.Text);
                // cmd.Parameters.AddWithValue("@DATERSLVD", DBNull.Value);


                //  Analyst Name
                if (cmb_AnalystName.SelectedValue == null)
                {
                    cmd.Parameters.AddWithValue("@ASSGNTO", DBNull.Value);
                }
                else
                {
                    cmd.Parameters.AddWithValue("@ASSGNTO", cmb_AnalystName.SelectedValue);
                }

                con.Open();
                cmd.ExecuteNonQuery();
                con.Close();



            // Here is where I am trying to call the method
               HBD_Count();




                // Clear Search Fields
                cmb_AnalystName.SelectedIndex = -1;
                MessageBox.Show("Dispute Assinged!!!");
                AssignList();

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

    }

Answer 1

You can use the following code to accomplish this task:

Window parentWindow = Window.GetWindow(this);
((MainWindow)parentWindow).HBD_Count();

The MVVM concept allows simplifying the task if you need to call different various methods. In this case you will need to include the method call inside the Command and will be able to access it using a RelativeSource binding .