fix missing files

Author: zwcloud

Demo/Windows/DrawPngInMemory/Form1.cs

@@ -0,0 +1,39 @@
+using System.Windows.Forms;
+using Cairo;
+using Color = Cairo.Color;
+using Graphics = System.Drawing.Graphics;
+
+namespace DrawPngInMemory
+{
+    public partial class Form1 : Form
+    {
+        public Graphics Graphics1 { get; private set; }
+        public Context Context1 { get; set; }
+        public Win32Surface Surface1 { get; private set; }
+        byte[] pngData = System.IO.File.ReadAllBytes("1.png");
+
+        public Form1()
+        {
+            InitializeComponent();
+        }
+
+        protected override void OnPaint(PaintEventArgs e)
+        {
+            base.OnPaint(e);
+
+            Graphics1 = e.Graphics;
+            Surface1 = new Win32Surface(Graphics1.GetHdc());
+            Context1 = new Context(Surface1);
+
+            using (ImageSurface pngImageSurface = new ImageSurface(pngData))
+            {
+                Context1.SetSource(pngImageSurface);
+                Context1.Paint();
+            }
+
+            Graphics1.Dispose();
+            Context1.Dispose();
+            Surface1.Dispose();
+        }
+    }
+}

Demo/Windows/DrawPngInMemory/Program.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace DrawPngInMemory
+{
+    static class Program
+    {
+        /// <summary>
+        /// The main entry point for the application.
+        /// </summary>
+        [STAThread]
+        static void Main()
+        {
+            Application.EnableVisualStyles();
+            Application.SetCompatibleTextRenderingDefault(false);
+            Application.Run(new Form1());
+        }
+    }
+}

Demo/Windows/WinFormDemo/Form1.Designer.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace WinFormDemo
+{
+    static class Program
+    {
+        /// <summary>
+        /// The main entry point for the application.
+        /// </summary>
+        [STAThread]
+        static void Main()
+        {
+            Application.EnableVisualStyles();
+            Application.SetCompatibleTextRenderingDefault(false);
+            Application.Run(new Form1());
+        }
+    }
+}