Question

我想在选中复选框时动态添加堆栈面板，如果未选中复选框，则我想删除该堆栈面板。我试过以下代码。当我运行程序并检查复选框时，没有任何事情发生。

private void bCheckbox_Checked(object sender, RoutedEventArgs e)
    {
        var stackpanel = new StackPanel{ Orientation = Orientation.Vertical };
        stackpanel.SetValue(Grid.RowProperty, 2);
        stackpanel.SetValue(Grid.ColumnProperty, 1);

        var textblockstart = new TextBlock { Text = "loop start time", FontSize = 18, 
                                            Margin = new Thickness(20,20,0,0)};
        var textboxstart = new TextBox { Name = "StartTextBox", Height=27, Width=110, 
                                         Margin = new Thickness(20,10,0,0) };
        var textblockend = new TextBlock { Text = "loop end time", FontSize = 18, 
                                            Margin = new Thickness(20,20,0,0)};
        var textboxend = new TextBox { Name = "EndTextBox", Height=27, Width=110,
                                         Margin = new Thickness(20,10,0,0) };

        stackpanel.Children.Add(textblockstart);
        stackpanel.Children.Add(textboxstart);
        stackpanel.Children.Add(textblockend);
        stackpanel.Children.Add(textboxend);

    }

Answer 1

您可以执行的操作是在using System.Data; using System.Data.SqlClient; using System.Collections.Generic; using System.Configuration; [System.Web.Services.WebMethod] public static List<string> GetCities(string prefixText) { SqlConnection con = new SqlConnection (ConfigurationManager.ConnectionStrings["dbconnection"].ToString()); con.Open(); SqlCommand cmd = new SqlCommand("select * from City where CityName like @Name+'%'", con); cmd.Parameters.AddWithValue("@Name", prefixText); SqlDataAdapter da = new SqlDataAdapter(cmd); DataTable dt = new DataTable(); da.Fill(dt); List<string> CoityNames = new List<string>(); for (int i = 0; i < dt.Rows.Count; i++) { CityNames.Add(dt.Rows[i][1].ToString()); } return CityNames; }设置为StackPanel的情况下在xaml标记中创建Visibility，并在切换事件中切换Collapsed的可见性StackPanel

选中复选框后添加堆栈面板

1 个答案: