Question 134097 in Visual Studio Code Question posted in
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Visual Studio Code – SizeChangedEventArgs could not be found are you missing a using directive

i am not able to figure this error out:
"SizeChangedEventArgs could not be found are you missing a using directive…"

Here my setup and code:

  • using visual studio 2019

  • Csharp

  • Build .Net Framework 4.8

  • using System.Windows

     private void Form1_SizeChanged(object sender, SizeChangedEventArgs e)
  {
      // Retrieve the old size from the event arguments
      var newSize = ((Form)sender).Size;
      var oldWidth = e.PreviousSize.Width;
      var oldHeight = e.PreviousSize.Height;
      var oldSize = new Size(oldWidth, oldHeight);

      // Do something with the old size
      Console.WriteLine("Old size: {0}", oldSize);
  }
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2

Answers


  1. Chosen as BEST ANSWER
    0

    Thanks to your responses, it seems i have to go educate myself about forms...So i am using winforms but not WPF.. from what i gathered from initial reading.

    below is just for the record on how i solved my immediate problem.

    -Calling the form:

    assignForm myassignForm = new assignForm(List1_lst, List2_lst);

    • Form Class:

        public partial class assignForm : Form
  {
   private Size client_old_sz = new System.Drawing.Size(800, 900);
   double ratioWidth = 1.0;
   double ratioHeight = 1.0;

    • Form Resize handler declaration:

        private void InitializeComponent(List<string> list1, List<string> list2)
    {
   this.Load += new EventHandler(Form1_Load); 
   this.Resize += new EventHandler(Form1_Resize);

    • Resize Event handlers definition:

      private void Form1_Load(object sender, EventArgs e)
  {
      client_old_sz = this.Size; // store the initial size of the form
  }

  private void Form1_Resize(object sender, EventArgs e)
  {
      // calculate the ratio of the new size to the old size
       this.ratioWidth = (double)this.Size.Width / client_old_sz.Width;
       this.ratioHeight = (double)this.Size.Height / client_old_sz.Height;

      // store the new size as the old size for the next resize event
      client_old_sz = this.Size;
  }

  2. 0

    For WinForms, the SizeChanged event gets written like this on my system:

    private void Form1_SizeChanged(object sender, EventArgs e)
{

}
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