SizeChangedEventArgs找不到，你错过了一个using指令

Question

我无法找出这个错误:找不到SizeChangedEventArgs是否缺少using指令…">

下面是我的设置和代码:

• using visual studio 2019

• Csharp

• Build .Net Framework 4.8

• 使用系统。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);
  }
  

Answer 1

对于WinForms,SizeChanged事件在我的系统上是这样写的:

private void Form1_SizeChanged(object sender, EventArgs e)
{
}

Answer 2

多亏了你的回复，看来我得自学一下表单了…所以我使用的是winforms，而不是WPF。从我最初的阅读中收集到的。

下面的只是记录一下我是如何解决我当前的问题的。

-调用表单:

assignForm myassignForm = new assignForm(List1_lst, List2_lst);

• 形式类:

  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声明:

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

• 调整事件处理程序定义:

  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;
  }