Question

我确信我已经搜索了很多并尝试了很多方法来解决它。但是我做不到。

我有这样的用户控件：

public partial class Categories : UserControl
{
    public Categories()
    {
        InitializeComponent();
    }

    public void GetCats()
    {
        string sqlcmdString = "select * from categories";
        string connString = @"Data Source=DESKTOP-L6OBVA4\SQLEXPRESS;Initial Catalog=QLDB;Integrated Security=True";
        SqlConnection con = new SqlConnection(connString);
        SqlCommand cmd = new SqlCommand(sqlcmdString, con);
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        con.Open();
        DataTable dt = new DataTable();
        da.Fill(dt);
        dgv_categories.ItemsSource = dt.AsDataView();
    }
}

和主窗口：

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        var tabs = new ObservableCollection<TabItem>  {
            new TabItem() { Content = new Import(), Header = "Import from Excel files"},
            new TabItem() { Content = new Categories(), Header = "Categories" },
            new TabItem() { Content = new Products(), Header = "Products"}
        };

        tabControl.ItemsSource = tabs;
    }


    private void tabControl_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        if (e.OriginalSource == this.tabControl)
        {
            if (this.tabControl.SelectedIndex == 1)
            {
               // personally, i need to do something here to call GetCats() method to reload all all categories from database to datagridview

            }
        }
    }
}

如何从主窗口调用用户控件中的GetCats（）方法？或者换句话说，如何更新TabItem [1]，这意味着：类别的选项卡。获取新数据。感谢。

Answer 1

您可以转换当前所选Content的{{1}}属性：

TabItem

在tabcontrol WPF上更改选项卡时，从另一个窗口重新加载TabItem中的数据

1 个答案: