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Author: gewarren

snippets/csharp/System.Drawing/Bitmap/.ctor/Program.cs

@@ -5,8 +5,8 @@ internal static class Program
     [STAThread]
     private static void Main()
     {
-        BitmapConstructorForm1.Run();
-        BitmapConstructorForm11.Run();
+        //BitmapConstructorForm1.Run();
+        //BitmapConstructorForm11.Run();
         BitmapConstructorForm12.Run();
     }
 }

snippets/csharp/System.Drawing/Bitmap/.ctor/form1.cs

@@ -2,26 +2,24 @@
 using System.Drawing;
 using System.Windows.Forms;
 
-public class BitmapConstructorForm1 :
-    System.Windows.Forms.Form
+public class BitmapConstructorForm1 : Form
 
 {
-    #region " Windows Form Designer generated code "
-
     public BitmapConstructorForm1() : base()
     {
-
-        //This call is required by the Windows Form Designer.
+        // This call is required by the Windows Form Designer.
         InitializeComponent();
         Button1.Click += new EventHandler(Button1_Click);
         Button2.Click += new EventHandler(Button2_Click);
-        InitializeBitmap();
+
+        string filePath = "path//to//your//image.bmp";
+        InitializeBitmap(filePath);
         InitializeStreamBitmap();
 
-        //Add any initialization after the InitializeComponent() call
+        // Add any initialization after the InitializeComponent() call.
     }
 
-    //Form overrides dispose to clean up the component list.
+    // Form overrides Dispose to clean up the component list.
     protected override void Dispose(bool disposing)
     {
         if (disposing)
@@ -31,50 +29,50 @@ protected override void Dispose(bool disposing)
         base.Dispose(disposing);
     }
 
-    //Required by the Windows Form Designer
+    // Required by the Windows Form Designer.
     private System.ComponentModel.IContainer components = null;
 
-    //NOTE: The following procedure is required by the Windows Form Designer
-    //It can be modified using the Windows Form Designer.  
-    //Do not modify it using the code editor.
-    internal System.Windows.Forms.Button Button1;
-    internal System.Windows.Forms.PictureBox PictureBox1;
-    internal System.Windows.Forms.Button Button2;
+    // NOTE: The following procedure is required by the Windows Form Designer.
+    // It can be modified using the Windows Form Designer.  
+    // Do not modify it using the code editor.
+    internal Button Button1;
+    internal PictureBox PictureBox1;
+    internal Button Button2;
 
     [System.Diagnostics.DebuggerStepThrough]
     private void InitializeComponent()
     {
-        Button1 = new System.Windows.Forms.Button();
-        PictureBox1 = new System.Windows.Forms.PictureBox();
-        Button2 = new System.Windows.Forms.Button();
+        Button1 = new Button();
+        PictureBox1 = new PictureBox();
+        Button2 = new Button();
         SuspendLayout();
         // 
         // Button1
         // 
-        Button1.Location = new System.Drawing.Point(24, 192);
+        Button1.Location = new Point(24, 192);
         Button1.Name = "Button1";
-        Button1.Size = new System.Drawing.Size(96, 23);
+        Button1.Size = new Size(96, 23);
         Button1.TabIndex = 2;
         Button1.Text = "Rotate and Flip";
         // 
         // PictureBox1
         // 
-        PictureBox1.Location = new System.Drawing.Point(48, 40);
+        PictureBox1.Location = new Point(48, 40);
         PictureBox1.Name = "PictureBox1";
-        PictureBox1.Size = new System.Drawing.Size(168, 72);
+        PictureBox1.Size = new Size(168, 72);
         PictureBox1.TabIndex = 3;
         PictureBox1.TabStop = false;
         // 
         // Button2
         // 
-        Button2.Location = new System.Drawing.Point(152, 192);
+        Button2.Location = new Point(152, 192);
         Button2.Name = "Button2";
         Button2.TabIndex = 4;
         Button2.Text = "Button2";
         // 
         // Form1
         // 
-        ClientSize = new System.Drawing.Size(292, 266);
+        ClientSize = new Size(292, 266);
         Controls.Add(Button2);
         Controls.Add(PictureBox1);
         Controls.Add(Button1);
@@ -83,8 +81,6 @@ private void InitializeComponent()
         ResumeLayout(false);
     }
 
-    #endregion
-
     // <snippet3Intro>
     // The following code example demonstrates constructing how to construct 
     // a new Bitmap from a file.
@@ -113,24 +109,22 @@ private void InitializeComponent()
     //<snippet4>
     Bitmap bitmap1;
 
-    private void InitializeBitmap()
+    private void InitializeBitmap(string filePath)
     {
         try
         {
-            bitmap1 = (Bitmap)Bitmap.FromFile(@"C:\Documents and Settings\" +
-                @"All Users\Documents\My Music\music.bmp");
+            bitmap1 = (Bitmap)Bitmap.FromFile(filePath);
             PictureBox1.SizeMode = PictureBoxSizeMode.AutoSize;
             PictureBox1.Image = bitmap1;
         }
         catch (System.IO.FileNotFoundException)
         {
-            MessageBox.Show("There was an error." +
-                "Check the path to the bitmap.");
+            MessageBox.Show("There was an error. Check the path to the bitmap.");
         }
     }
     //</snippet4>
 
-    private void Button1_Click(object sender, System.EventArgs e)
+    private void Button1_Click(object sender, EventArgs e)
     {
 
         if (bitmap1 != null)
@@ -150,9 +144,8 @@ private void Button1_Click(object sender, System.EventArgs e)
     // a form that contains a button named Button2. Paste the code into the
     // form and associate this method with the button's Click event.
     //<snippet1>
-    private void Button2_Click(object sender, System.EventArgs e)
+    private void Button2_Click(object sender, EventArgs e)
     {
-
         Bitmap bitmap1 = Bitmap.FromHicon(SystemIcons.Hand.Handle);
         Graphics formGraphics = CreateGraphics();
         GraphicsUnit units = GraphicsUnit.Point;
@@ -176,38 +169,42 @@ private void InitializeStreamBitmap()
     {
         try
         {
-            System.Net.WebRequest request =
-                System.Net.WebRequest.Create(
-                "http://www.microsoft.com//h/en-us/r/ms_masthead_ltr.gif");
-            System.Net.WebResponse response = request.GetResponse();
-            System.IO.Stream responseStream =
-                response.GetResponseStream();
-            Bitmap bitmap2 = new Bitmap(responseStream);
+            using System.Net.Http.HttpClient client = new();
+            using System.Net.Http.HttpResponseMessage response =
+                client.GetAsync("http://www.microsoft.com//h/en-us/r/ms_masthead_ltr.gif")
+                .GetAwaiter()
+                .GetResult();
+            response.EnsureSuccessStatusCode();
+            using System.IO.Stream responseStream =
+                response.Content.ReadAsStreamAsync()
+                .GetAwaiter()
+                .GetResult();
+            Bitmap bitmap2 = new(responseStream);
             PictureBox1.Image = bitmap2;
         }
-        catch (System.Net.WebException)
+        catch (System.Net.Http.HttpRequestException)
         {
-            MessageBox.Show("There was an error opening the image file."
-               + "Check the URL");
+            MessageBox.Show("There was an error opening the image file. Check the URL");
         }
     }
     //</snippet2>
+
     // The following code example demonstrates how to use the Image.PixelFormat,
     // Image.Height, Image.Width, and BitmapData.Scan0 properties; the Bitmap.LockBits 
     // and Bitmap.UnlockBits methods; and the ImageLockMode enumeration. 
     // This example is designed to be used with Windows
     // Forms. To run this example, paste it into a form and handle the form's Paint event by
     // calling the LockUnlockBitsExample method, passing e as PaintEventArgs. 
     // This example assumes the existence of an 24bpp image file named fakePhoto.jpg at c:\.
+
     //<snippet5>
-    private void LockUnlockBitsExample(PaintEventArgs e)
+    private static void LockUnlockBitsExample(PaintEventArgs e)
     {
-
         // Create a new bitmap.
-        Bitmap bmp = new Bitmap("c:\\fakePhoto.jpg");
+        Bitmap bmp = new("c:\\fakePhoto.jpg");
 
         // Lock the bitmap's bits.
-        Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);
+        Rectangle rect = new(0, 0, bmp.Width, bmp.Height);
         System.Drawing.Imaging.BitmapData bmpData =
             bmp.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite,
             bmp.PixelFormat);
@@ -224,7 +221,9 @@ private void LockUnlockBitsExample(PaintEventArgs e)
 
         // Set every third value to 255. A 24bpp bitmap will look red.
         for (int counter = 2; counter < rgbValues.Length; counter += 3)
+        {
             rgbValues[counter] = 255;
+        }
 
         // Copy the RGB values back to the bitmap
         System.Runtime.InteropServices.Marshal.Copy(rgbValues, 0, ptr, bytes);

snippets/csharp/System.Drawing/Bitmap/.ctor/form11.cs

@@ -2,22 +2,19 @@
 using System.Drawing;
 using System.Windows.Forms;
 
-public class BitmapConstructorForm11 :
-    System.Windows.Forms.Form
+public class BitmapConstructorForm11 : Form
 
 {
-    #region " Windows Form Designer generated code "
-
     public BitmapConstructorForm11() : base()
     {
 
-        //This call is required by the Windows Form Designer.
+        // This call is required by the Windows Form Designer.
         InitializeComponent();
 
-        //Add any initialization after the InitializeComponent() call
+        // Add any initialization after the InitializeComponent() call.
     }
 
-    //Form overrides dispose to clean up the component list.
+    // Form overrides Dispose to clean up the component list.
     protected override void Dispose(bool disposing)
     {
         if (disposing)
@@ -27,38 +24,45 @@ protected override void Dispose(bool disposing)
         base.Dispose(disposing);
     }
 
-    //Required by the Windows Form Designer
+    // Required by the Windows Form Designer.
     private System.ComponentModel.IContainer components = null;
 
-    //NOTE: The following procedure is required by the Windows Form Designer
-    //It can be modified using the Windows Form Designer.  
-    //Do not modify it using the code editor.
+    // NOTE: The following procedure is required by the Windows Form Designer.
+    // It can be modified using the Windows Form Designer.  
+    // Do not modify it using the code editor.
     [System.Diagnostics.DebuggerStepThrough]
     private void InitializeComponent()
     {
         // 
         // Form1
         // 
-        ClientSize = new System.Drawing.Size(292, 266);
+        ClientSize = new Size(292, 266);
         Name = "Form1";
         Text = "Form1";
-        Paint += new System.Windows.Forms.PaintEventHandler(Form1_Paint);
+        Paint += new PaintEventHandler(Form1_Paint);
     }
 
-    #endregion
-
     //<snippet1>
-    private void ConstructFromResourceSaveAsGif(PaintEventArgs e)
+    private static void ConstructFromResourceSaveAsGif(PaintEventArgs e)
     {
-
         // Construct a bitmap from the button image resource.
-        Bitmap bmp1 = new Bitmap(typeof(Button), "Button.bmp");
+        string resourceName = "Button.bmp";
+        Bitmap bmp1;
+        try
+        {
+            bmp1 = new(typeof(Button), resourceName);
+        }
+        catch (ArgumentException ex)
+        {
+            MessageBox.Show($"The resource '{resourceName}' was not found. {ex.Message}");
+            return;
+        }
 
         // Save the image as a GIF.
         bmp1.Save("c:\\button.gif", System.Drawing.Imaging.ImageFormat.Gif);
 
         // Construct a new image from the GIF file.
-        Bitmap bmp2 = new Bitmap("c:\\button.gif");
+        Bitmap bmp2 = new("c:\\button.gif");
 
         // Draw the two images.
         e.Graphics.DrawImage(bmp1, new Point(10, 10));