Image resizing

Details
Written by: Stanko Milosev
Category: C#
Hits: 3688
Recently I had to automatically resize images, but I ran into problem that some images were rotated. Problem was the EXIF data on some of the images was altering the orientation of the images. As explained here. So here is my method for image resizing: 
    public void ResizeImage(string originalFilename, string saveTo,
                     int canvasWidth, int canvasHeight)
    {
      try
      {
        Image image = Image.FromFile(originalFilename);

        Image thumbnail = new Bitmap(canvasWidth, canvasHeight);
        Graphics graphic = Graphics.FromImage(thumbnail);

        graphic.InterpolationMode = InterpolationMode.HighQualityBicubic;
        graphic.SmoothingMode = SmoothingMode.HighQuality;
        graphic.PixelOffsetMode = PixelOffsetMode.HighQuality;
        graphic.CompositingQuality = CompositingQuality.HighQuality;

        int originalWidth = image.Width;
        int originalHeight = image.Height;

        double ratioX = canvasWidth / (double)originalWidth;
        double ratioY = canvasHeight / (double)originalHeight;

        double ratio = ratioX < ratioY ? ratioX : ratioY;

        int newHeight = Convert.ToInt32(originalHeight * ratio);
        int newWidth = Convert.ToInt32(originalWidth * ratio);

        int posX = Convert.ToInt32((canvasWidth - (originalWidth * ratio)) / 2);
        int posY = Convert.ToInt32((canvasHeight - (originalHeight * ratio)) / 2);

        graphic.Clear(Color.White); // white padding

        graphic.DrawImage(image, posX, posY, newWidth, newHeight);

        ImageCodecInfo[] info = ImageCodecInfo.GetImageEncoders();
        EncoderParameters encoderParameters;
        encoderParameters = new EncoderParameters(1);
        encoderParameters.Param[0] = new EncoderParameter(Encoder.Quality,
                         100L);

        int OrientationKey = 0x0112;
        const int NotSpecified = 0;
        const int NormalOrientation = 1;
        const int MirrorHorizontal = 2;
        const int UpsideDown = 3;
        const int MirrorVertical = 4;
        const int MirrorHorizontalAndRotateRight = 5;
        const int RotateLeft = 6;
        const int MirorHorizontalAndRotateLeft = 7;
        const int RotateRight = 8;

        if (image.PropertyIdList.Contains(OrientationKey))
        {
          if (image.PropertyIdList.Contains(OrientationKey))
          {
            var orientation = (int)image.GetPropertyItem(OrientationKey).Value[0];
            switch (orientation)
            {
              case NotSpecified: // Assume it is good.
              case NormalOrientation:
                // No rotation required.
                break;
              case MirrorHorizontal:
                thumbnail.RotateFlip(RotateFlipType.RotateNoneFlipX);
                break;
              case UpsideDown:
                thumbnail.RotateFlip(RotateFlipType.Rotate180FlipNone);
                break;
              case MirrorVertical:
                thumbnail.RotateFlip(RotateFlipType.Rotate180FlipX);
                break;
              case MirrorHorizontalAndRotateRight:
                thumbnail.RotateFlip(RotateFlipType.Rotate90FlipX);
                break;
              case RotateLeft:
                thumbnail.RotateFlip(RotateFlipType.Rotate90FlipNone);
                break;
              case MirorHorizontalAndRotateLeft:
                thumbnail.RotateFlip(RotateFlipType.Rotate270FlipX);
                break;
              case RotateRight:
                thumbnail.RotateFlip(RotateFlipType.Rotate270FlipNone);
                break;
              default:
                throw new NotImplementedException("An orientation of " + orientation + " isn't implemented.");
            }
          }
        }

        //thumbnail.RotateFlip(RotateFlipType.Rotate90FlipNone);
        thumbnail.Save(saveTo, info[1], encoderParameters);
        Debug.WriteLine($"Thumbnail from file: {originalFilename} created in {saveTo}");
      }
      catch (Exception e)
      {
        Debug.WriteLine($"Error creating thumbnail: {e.Message}");
      }
    }
POI: 
int OrientationKey = 0x0112;
const int NotSpecified = 0;
const int NormalOrientation = 1;
const int MirrorHorizontal = 2;
const int UpsideDown = 3;
const int MirrorVertical = 4;
const int MirrorHorizontalAndRotateRight = 5;
const int RotateLeft = 6;
const int MirorHorizontalAndRotateLeft = 7;
const int RotateRight = 8;

if (image.PropertyIdList.Contains(OrientationKey))
{
  if (image.PropertyIdList.Contains(OrientationKey))
  {
	var orientation = (int)image.GetPropertyItem(OrientationKey).Value[0];
	switch (orientation)
	{
	  case NotSpecified: // Assume it is good.
	  case NormalOrientation:
		// No rotation required.
		break;
	  case MirrorHorizontal:
		thumbnail.RotateFlip(RotateFlipType.RotateNoneFlipX);
		break;
	  case UpsideDown:
		thumbnail.RotateFlip(RotateFlipType.Rotate180FlipNone);
		break;
	  case MirrorVertical:
		thumbnail.RotateFlip(RotateFlipType.Rotate180FlipX);
		break;
	  case MirrorHorizontalAndRotateRight:
		thumbnail.RotateFlip(RotateFlipType.Rotate90FlipX);
		break;
	  case RotateLeft:
		thumbnail.RotateFlip(RotateFlipType.Rotate90FlipNone);
		break;
	  case MirorHorizontalAndRotateLeft:
		thumbnail.RotateFlip(RotateFlipType.Rotate270FlipX);
		break;
	  case RotateRight:
		thumbnail.RotateFlip(RotateFlipType.Rotate270FlipNone);
		break;
	  default:
		throw new NotImplementedException("An orientation of " + orientation + " isn't implemented.");
	}
  }
}
With this code I was checking if image has to be rotated. Example application (at this moment still under development), you can see on my GitHub.

---

UPDATE 2024-04-06 Note that Image and are I disposable, so correct way would be: 

    public void ResizeImage(string originalFilename, string saveTo,
                     int canvasWidth, int canvasHeight)
    {
      try
      {
        using (Image image = Image.FromFile(originalFilename))
        using (Image thumbnail = new Bitmap(canvasWidth, canvasHeight))
        using (Graphics graphic = Graphics.FromImage(thumbnail))
        {
...
Otherwise image file will stay locked.

Infragistics UltraGrid with hierarchical data

Details
Written by: Stanko Milosev
Category: C#
Hits: 1518
using System;
using System.Collections.Generic;
using System.Windows.Forms;

namespace UltraGridHierarchical
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            List<MyChild> stankosKids = new List<MyChild>();
            stankosKids.Add(new MyChild {Name = "Velimir", Gender = "Male"});
            stankosKids.Add(new MyChild {Name = "Hilda", Gender = "Female"});

            List<MyChild> arnoldsKids = new List<MyChild>();
            arnoldsKids.Add(new MyChild {Name = "Thomas", Gender = "Male"});
            arnoldsKids.Add(new MyChild {Name = "Sabrina", Gender = "Female"});

            List<MyChild> chucksKids = new List<MyChild>();
            chucksKids.Add(new MyChild {Name = "Bruce", Gender = "Male"});
            chucksKids.Add(new MyChild {Name = "Lee", Gender = "Female"});

            List<MyParent> list = new List<MyParent>();
            list.Add(new MyParent {ID = 1, FirstName = "Stanko", LastName = "Milosev", Address = "Herseler strasse 8", MyKids = stankosKids});
            list.Add(new MyParent {ID = 2, FirstName = "Arnold", LastName = "Schwarzeneger", Address = "Whitehouse 1", MyKids = arnoldsKids});
            list.Add(new MyParent {ID = 3, FirstName = "Chuck", LastName = "Norris", Address = "Las Vegas", MyKids = chucksKids});

            ultraGrid1.SetDataBinding(list, null);
        }

        public class MyParent
        {
            public int ID { get; set; }
            public string FirstName { get; set; }
            public string LastName { get; set; }
            public string Address { get; set; }

            public List<MyChild> MyKids { get; set; }
        }

        public class MyChild
        {
            public string Name { get; set; }
            public string Gender { get; set; }
        }
    }
}
Source code.

Custom section in App.Config

Details
Written by: Stanko Milosev
Category: C#
Hits: 6276
One example of custom section in configuration file.

App.Config: 

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  
  <configSections>     
    <section name="links" type="System.Configuration.NameValueSectionHandler">
    </section>
  </configSections> 
  
  <links>
      <add key="link1" value="http://www.milosev.com/csharp/" />
      <add key="link2" value="http://milosev.com/asp-net-mvc-3" />
  </links>
  
  <appSettings>
      <add key="homePage" value="http://milosev.com/" />
  </appSettings>    
  
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" />
    </startup>
</configuration>
.NET code: 
using System;
using System.Collections.Specialized;
using System.Configuration;

namespace CustomConfig
{
    class Program
    {
        static void Main(string[] args)
        {
            NameValueCollection links = ConfigurationManager.GetSection("links") as NameValueCollection;
            string homePage = ConfigurationManager.AppSettings.Get("homePage");

            Console.WriteLine("Home page: " + homePage);

            foreach (string link in links)
            {
                Console.WriteLine("Link: " + links.Get(link));
            }

            Console.WriteLine("Press any key...");
            Console.ReadKey();
        }
    }
}
In reference list you will need to add System.Configuration.

POI: 

  <configSections>     
    <section name="links" type="System.Configuration.NameValueSectionHandler">
    </section>
  </configSections>

Here is more about configSection.

Also notice line:

Console.WriteLine("Link: " + links.Get(link));

Interpolated Strings vs Composite Formatting

Details
Written by: Stanko Milosev
Category: C#
Hits: 6418

One my example of interpolated string (taken from here):

string name = "stanko";
DateTime hours = DateTime.Now;
Console.WriteLine($"Name = {name}, hours = {hours:hh}");
Console.ReadKey();

Composite string:

string name = "stanko";
Console.WriteLine("Name = {0}, hours = {1:hh}", name, DateTime.Now);
Console.ReadKey();

According to Microsoft:

Interpolated string are easier to understand than a composite format string. 

  1. IEnumerable - new instance
  2. IComparer
  3. Regular expressions
  4. RabbitMQ

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