Timer未勾選

Question

今天，我已經試過的Visual Studio +的WinForms（我一直在使用Xamarin） 我不使用設計器，只需要創建空的項目和環節所需的庫。 因此，我的計時器不能正常工作，它只能以最小化的形式打勾。

App.cs

using System; 
using System.Windows.Forms; 

namespace Line 
{ 
    class App 
    { 
     [STAThread] 
     public static void Main() 
     { 
      Application.Run(new Window()); 
     } 
    } 
} 

Window.cs

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
using System.Windows.Forms; 
using System.Drawing; 
using System.ComponentModel; 

namespace Line 
{ 
    class Window : Form 
    { 
     Timer timer; 
     PictureBox pictureBox; 
     Bitmap bmp; 

     public struct Circle 
     { 
      public PointF position; 
      public SizeF size; 
     }; 

     List<Circle> circles; 

     public Window() 
     { 
      this.Text = "Line"; 
      this.Size = SizeFromClientSize(new Size(640, 480)); 
      pictureBox = new PictureBox(); 
      pictureBox.Dock = DockStyle.Fill; 
      pictureBox.BackColor = Color.White; 
      pictureBox.Paint += new PaintEventHandler(pictureBox_Paint); 
      this.Controls.Add(pictureBox); 
      this.Load += new EventHandler(Window_Load); 
      this.Resize += new EventHandler(Window_Resize); 
      circles = new List<Circle>(); 
      timer = new Timer(); 
      timer.Interval = 15; 
      timer.Enabled = true; 
      timer.Tick += new EventHandler(timer_Tick); 
     } 

     private void pictureBox_Paint(object sender, PaintEventArgs e) 
     { 
      Graphics g = Graphics.FromImage(bmp); 
      g.Clear(Color.Black); 
      foreach (Circle c in circles) 
      { 
       g.DrawEllipse(Pens.White, new RectangleF(c.position, c.size)); 
      } 
      pictureBox.Image = bmp; 
     } 

     private void timer_Tick(object sender, EventArgs e) 
     { 
      Circle c; 
      Console.WriteLine("Works"); 
      for (int i = 0; i < circles.Count; i++) 
      { 
       c = circles[i]; 
       c.size.Width = (c.size.Width > 200) ? 100 : c.size.Width + 1; 
       circles[i] = c; 
      } 
      pictureBox.Invalidate(); 
     } 

     private void Window_Load(object sender, EventArgs e) 
     { 
      bmp = new Bitmap(this.Width, this.Height); 
      circles.Add(new Circle()); 
      Circle c = circles[0]; 
      c.position = new PointF(100, 100); 
      c.size = new SizeF(100, 100); 
      circles[0] = c; 
     } 

     private void Window_Resize(object sender, EventArgs e) 
     { 
      bmp = new Bitmap(this.Width, this.Height); 
      pictureBox.Invalidate(); 
     } 
    } 
} 

相同的代碼在Xamarin工作得很好。

Answer 1

1）timer_Tick刪除行：pictureBox.Invalidate();
2）切口代碼pictureBox_Paint並在timer_Tick
3）糊底解決變量名稱衝突c