Question

我从MySQL数据库获得结果，我想在两列网格中显示它们。我在MainWIndow.xaml文件中设置了网格，并添加了列定义。由于网格中的行数取决于数据库结果的数量，因此我在c＃代码中定义了网格行。出于某种原因，grid.SetRow和grid.SetColumn方法抛出以下错误：

'System.Windows.Controls.Grid.SetRow(System.Windows.UIElement, int)' cannot be accessed with an instance reference; qualify it with a type name instead.

我不知道如何解决这个问题，因为我不知道'用类型名称限定它'是什么意思。我该如何解决这个问题？

这是我的MainWindow.xaml.cs文件：

MySqlConnection conn = new MySqlConnection(ConnString());
            try
            {
                conn.Open();
                string query = "SELECT * FROM maps ORDER BY MapTitle";
                MySqlCommand cmd = new MySqlCommand(query, conn);

                MySqlDataReader reader = cmd.ExecuteReader();
                if (reader.HasRows)
                {
                    RowDefinition MapRow = new RowDefinition();
                    int CurrentRow = 0;
                    int CurrentColumn = 0;
                    while (reader.Read())
                    {
                        /* Generate the preview attachment image */
                        Attachment PreviewFile = new Attachment();
                        PreviewFile.Details(Convert.ToInt32(reader["PreviewID"]));
                        BitmapImage MapPreview = new BitmapImage(new Uri(ImgURL() + "/" + PreviewFile.FileName, UriKind.Relative));
                        MapPreview.DecodePixelWidth = 384;
                        MapPreview.DecodePixelHeight = 216;

                        /* Generate the map title header */
                        TextBlock MapHeader = new TextBlock();
                        MapHeader.Text = Convert.ToString(reader["MapTitle"]);
                        BrushConverter bc = new BrushConverter();  //convert hex
                        MapHeader.Background = (Brush)bc.ConvertFrom("#243C5E");
                        MapHeader.Foreground = (Brush)bc.ConvertFrom("#F2F3F5");

                        /*  If we're in the right column, set it to the left column for the next iteration */
                        if(CurrentColumn == 1){
                            CurrentColumn = 0;
                            CurrentRow++;
                        /* Otherwise, update which column we're in. */
                        } else {
                            CurrentColumn++;
                            MapRow = new RowDefinition();
                        }

                        MapGrid.RowDefinitions.Add(MapRow);
                        /* Add the map title header to the grid in the appropriate row and column. */
                        MapGrid.Children.Add(MapHeader);
                        MapGrid.SetRow(MapHeader, CurrentRow);
                        MapGrid.SetColumn(MapHeader, CurrentColumn);
                        /* Add the map preview image to the grid in the appropriate row and column. */
                        MapGrid.Children.Add(MapPreview);
                        MapGrid.SetRow(MapPreview, CurrentRow);
                        MapGrid.SetColumn(MapPreview, CurrentRow);
                    }
                }
            }
            catch 
            {
                MessageBoxResult result = MessageBox.Show("A database error occurred while gathering the results.");
            }
            finally
            {
                conn.Close();
                conn.Dispose();
            }

这是我的网格XAML：

<Grid Name="MapGrid" HorizontalAlignment="Center" Margin="0,25,0,0">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width=".4*"/>
                <ColumnDefinition Width=".4*"/>
            </Grid.ColumnDefinitions>
        </Grid>

谢谢你的时间！

Answer 1

@JSJ是绝对正确的。您应该使用GridView或ListView。网格用于布局而不是用于显示数据。我更喜欢ListView，您可以使用MVVM模式将您为DB获取的行绑定到列表视图。或者只需硬编码：yourListView.Items = itemsFromDb

如何根据我的数据库行以编程方式在C＃中填充WPF网格？

1 个答案: