How do I send enum to library control and set I?

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I need to set an image size mode, so I create enum with three modes, I need to choose the size mode then send it to property and set it, how can I do it?

I know this code is wrong but this is the idea I need.

What I have tried:

// in windows application

C#

enum sizeMode
    {
        Stretch,Normal,Fit
    };
 private void stretchToolStripMenuItem_Click(object sender, EventArgs e)
        {
            sameehViewer.SizeMode = sizeMode.Stretch;
        }

// in library control

C#

enum _sizeMode;
  public enum SizeMode
  {
      set
      {
          _sizeMode = value;
          SetSizeMode();
      }
      get
      {
          return _sizeMode;
      }
  }

Posted 23-Nov-20 2:25am

sameeh shadid

Updated 23-Nov-20 3:19am

v3

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BillWoodruff · Answer 1 · 2020-11-23T03:19:00

I suggest you define the Enum as

public enum SizeMode
{
    Stretch,Normal,Fit
}

Assuming 'sameehViewer is an instance of a Class defined in your library:

1) If you define the Enum in the app: the Library/Class is going to need a reference to the app the Enum is defined in: that creates an undesirable dependency, and exposes the app to possible unwanted changes.

2) This is very confused code:

enum _sizeMode;
public enum SizeMode // compile error here
{
  set
  {
      _sizeMode = value;
      SetSizeMode(); // logic error here: how will the method know the setting ?
  }
  get
  {
      return _sizeMode;
  }
}

3) Consider defining the Enum in the library with access set to public: then, when your app has a valid reference to an instance of the library, it can select one of the Enum values to pass.

namespace ViewerLibrary
{
    public enum SizeMode
    {
        Stretch, Normal, Fit
    }

    public class Viewer
    {
        public SizeMode viewSizeMode { set; get; } = SizeMode.Normal;

        public void SetSizeMode(SizeMode szMode)
        {
            viewSizeMode = szMode;
        }
    }
}

Note the use of a Method to set the Property value: having setters or getters in a Property cause side-effects is a bad code practice..

4)After you add a reference to the Viewer dll to the app: in the app main form you can then create an instance of the Viewer, and do whatever:

using ViewerLibrary;

namespace TheApp
{
    private Viewer viewer = new Viewer();
    
    private void Form1_Load(object sender, EventArgs e)
    {
        viewer.SetSizeMode(SizeMode.Stretch);
    }
}