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using SkiaSharp;
using SkiaSharp.Views.Desktop;
using System;
using System.Threading.Tasks;
using System.Windows;
 
namespace WpfApp2 {
 
    public partial class MainWindow : Window {
 
 
 
        public  MainWindow() {
            InitializeComponent();
 
 
 
 
        }
 
		private int x;
		private int y;
 
        private void OnPaintSample(object sender, SKPaintSurfaceEventArgs e )
		{
			Render( e.Surface.Canvas );
		}
 
 		public void Render(SKCanvas canvas)		{
 
			if(y == 1)			{
				canvas.Clear();
				y = 0;
			}
 
			SKPaint thickLinePaint = new SKPaint
			{
				Style = SKPaintStyle.Stroke,
				Color = SKColors.Orange,
				StrokeWidth = 5
			};
 
 
			canvas.DrawLine(x, 0, x, 500, thickLinePaint);
			canvas.DrawLine(0, x, x, 0, thickLinePaint);
		}
 
        private  async void Window_Loaded(object sender, RoutedEventArgs e) {
 
 
            while ( true ){
				for ( int i = 0; i <= 600; ++i ){
					x = i;
					this.skElement.InvalidateVisual();
					await Task.Delay(TimeSpan.FromSeconds(0.001));
					y = 1;
 
				}
			}
 
 
		}
    }
}
 

prog.c:1:1: error: unknown type name ‘using’
 using SkiaSharp;
 ^~~~~
prog.c:2:1: error: unknown type name ‘using’
 using SkiaSharp.Views.Desktop;
 ^~~~~
prog.c:2:16: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘.’ token
 using SkiaSharp.Views.Desktop;
                ^
prog.c:3:1: error: unknown type name ‘using’
 using System;
 ^~~~~
prog.c:4:1: error: unknown type name ‘using’
 using System.Threading.Tasks;
 ^~~~~
prog.c:4:13: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘.’ token
 using System.Threading.Tasks;
             ^
prog.c:5:1: error: unknown type name ‘using’
 using System.Windows;
 ^~~~~
prog.c:5:13: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘.’ token
 using System.Windows;
             ^
prog.c:7:1: error: unknown type name ‘namespace’
 namespace WpfApp2 {
 ^~~~~~~~~
prog.c:7:19: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘{’ token
 namespace WpfApp2 {
                   ^

Standard output is empty