当我用其他方法更改控件时，为什么不更新控件？

Question

public partial class Person : Window
{
    private static TabControl tabControl;
    public Person()
    {
              InitializeComponent();
              tabControl = new TabControl();
              grid.Children.Add(tabControl);
    }

    public void someMethod(String name){
        TabItem newTab = new TabItem();
        newTab.Header = name;
        tabControl.Items.Add(newTab);
    }
}

public class Update{
    public void createGUI(String name){
        Person newPerson = new Person();
        newPerson.someMethod(name);
    }
}

The method someMethod is called in another class at some point after creating the class. It is called after InitializeComponent and everything in the constructor. However, the tab control still has no tabs even after someMethod finished.

Edit: To clarify, the Update method is only called once through the lifetime of the application. I only want one instance of Person.

Answer 1

public void createGUI(String name){
    Person newPerson = new Person();
    newPerson.someMethod(name);
}

There, you are creating a new Person object which is completely unrelated to the one that is being displayed to you. That new object is actually never displayed anywhere, so whatever you change about it, won't be visible to you.

Instead, you need to change the Person object that is actually around and displayed.

Alternatively, you could also show the new object by using newPerson.Show() but that will open a new window and not change the existing one.

Answer 2

原因很简单，您每次更新都创建一个新的Person类实例，因此一个实例中的更改不能反映在另一个实例中。