在 WPF 中为动态创建的矩形创建 _MouseLeftButtonDown

Question

我的应用程序显示了办公楼层的布局，其中座位被描绘为一个矩形，并且每个座位 ID 的边距、笔划、高度、宽度和对齐方式都保存在数据库中。根据分配状态，矩形的填充为红色或绿色。分配状态和占用详细信息保存在 SQL 数据库中。我需要为每个矩形设置单独的 MouseLeftButtonDown 方法。这将向我显示居住者的详细信息。

//Code Behind
public SeatUserControl()
        {
         string cubeId = "";
         string status = "";
         string name = "";
         string number = "";
         int height = 0;
         int width = 0;
         int leftMargin = 0;
         int topMargin = 0;
            InitializeComponent(); 
            SqlDataAdapter data = new SqlDataAdapter();
            DataTable dt = new DataTable();
            string SqlQuery = "select c.SeatId,c.Height,c.Width,c.Stroke,c.MarginTop,c.MarginLeft,e.Status,e.EmpName,e.EmpNumber from SeatDetails c Join MasterData e ON c.SeatId =e.SeatId";
            SqlConnection sqlconn = new SqlConnection(connectionstring);
            sqlconn.Open();
            data = new SqlDataAdapter(SqlQuery, sqlconn);
            data.Fill(dt);
            try
            {
                foreach (DataRow row in dt.Rows)
                {
                    leftMargin = int.Parse(row["MarginLeft"].ToString());
                    topMargin = int.Parse(row["MarginTop"].ToString());
                    height = int.Parse(row["Height"].ToString());
                    width = int.Parse(row["width"].ToString());
                    status = row["Status"].ToString();
                    cubeId = row["SeatId"].ToString();
                    name = row["EmpName"].ToString();
                    number = row["EmpNumber"].ToString();
                    PlaceRectangles();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            sqlconn.Close();
        }
        public string PlaceRectangles()
        {
            Rectangle rect = new Rectangle();
            rect.Height = height;
            rect.Width = width;
            SolidColorBrush StrokeBrush = new SolidColorBrush(Colors.Black);
            rect.Stroke = StrokeBrush;
            rect.VerticalAlignment = VerticalAlignment.Top;
            rect.HorizontalAlignment = HorizontalAlignment.Left;
            rect.Margin = new Thickness(leftMargin, topMargin, 0, 0);
            rect.RadiusX = 8;
            rect.RadiusY = 5;
           if (status.Equals("Allocated"))
            {
                SolidColorBrush myBrush = new SolidColorBrush(Colors.RoyalBlue);
                rect.Fill = myBrush;
            }
           else if (status.Equals("Available"))
            {
                SolidColorBrush myBrush = new SolidColorBrush(Colors.Red);
                rect.Fill = myBrush;
            }
           else 
            {
                SolidColorBrush myBrush = new SolidColorBrush(Colors.White);
                rect.Fill = myBrush;
            }
            seatCanvas.Children.Add(rect);
     }
}

//XAML
<UserControl x:Class="SpaceAllocator.SeatUserControl"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             d:DesignHeight="580" d:DesignWidth="800">
    <Grid Height="580" Width="800">
        <Canvas Name="seatCanvas" Height="580" Width="800" Margin="0,3,-2,78">       </Canvas>
    </Grid>
</UserControl>
enter code here

Answer 1

当你创建一个矩形时添加一个事件处理程序：

System.Windows.Shapes.Rectangle rect = new System.Windows.Shapes.Rectangle();
rect.MouseLeftButtonDown += rect_MouseLeftButtonDown;
// apply margins and what not

然后你在这里处理鼠标左键：

void rect_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
      var rect = sender as System.Windows.Shapes.Rectangle;
      // do whatever
}

Answer 2

如果您在应用程序启动时调用此代码，则会自动将事件处理程序添加到所有 Rectangle 类型的新对象：

EventManager.RegisterClassHandler(typeof(Rectangle), MouseLeftButtonDownEvent, 
    new MouseButtonEventHandler(OnMouseDown), false);

private void OnMouseDown(object sender, MouseButtonEventArgs e)
{
}