从另一个窗口访问和更改 WPF 中的控件

Question

在 MainWindow.xaml 中，我有一个名为 tbName 的文本框。在它下面我有一个带有 OnClickEvent 的按钮。我想在另一个名为 EmployeeRank1 的窗口中设置名为 welcomeRank1Tb 的 TextBlock 的文本，并在 tbName 文本框中输入文本。如何从 MainWindow.xaml.cs 访问 welcomeRank1Tb 并将其值设置为 tbName 中输入的值？

private void EmployeeRank1Button_Click(object sender, RoutedEventArgs e)
    {
        // creat SqlConnection, SqlCommand and SqlDataReader instances
        SqlConnection con;
        SqlCommand cmd;
        SqlDataReader reader;

        // try-catch block that looks for match between input and database information for EmployeeRank1
        try
        {
            string connectionString = ConfigurationManager.ConnectionStrings["CompanyManagementSystemm.Properties.Settings.ZaimovDBConnectionString"].ConnectionString;

            // create a query and select just the record we need 
            string query = "select * from EmployeeRank1 where Name = @name AND Password = @pass";

            // A local sqlconnection in a using statement ensure proper disposal at the end of this code 
            con = new SqlConnection(connectionString);
            con.Open();

            // Let the database do the work to search for the password and name pair
            cmd = new SqlCommand(query, con);
            cmd.Parameters.Add("@Name", SqlDbType.NVarChar).Value = tbName.Text;
            cmd.Parameters.Add("@pass", SqlDbType.NVarChar).Value = pbPassword.Password;
            reader = cmd.ExecuteReader();

            // If the reader has rows then the user/pass exists in the db table
            if (reader.HasRows)
            {
                EmployeeRank1 employeeRank1 = new EmployeeRank1();
                employeeRank1.Show();
            }
            else
            {
                NamePassNotMatchFrame.Content = new NamePassNotMatch();
            }
        }
        // catch a potential exception
        catch (Exception exception)
        {
            MessageBox.Show(exception.ToString());
        }

我想更改if (reader.HasRows) 语句中welcomeRank1Tb 的值

Answer 1

您可以在创建窗口后立即设置：

employeeRank1.welcomeRank1Tb.Text = tbName.Text;