C#：如何从另一个类更改 form1 中标签的文本？

public partial class Form1 : Form
{
    public delegate void LabelTextChangedEventHandler(string newText);
    public event LabelTextChangedEventHandler LabelTextChanged;

    public Form1()
    {
        InitializeComponent();
    }

    private void ChangeLabelText(string newText)
    {
        label1.Text = newText;
        LabelTextChanged?.Invoke(newText);
    }
}

public class OtherClass
{
    private Form1 _form1;

    public OtherClass(Form1 form1)
    {
        _form1 = form1;
        _form1.LabelTextChanged += OnLabelTextChanged;
    }

    private void OnLabelTextChanged(string newText)
    {
        // 在这里处理标签文本更改，例如更新本地变量或调用其他方法
    }
}

private void button1_Click(object sender, EventArgs e)
{
    ChangeLabelText("新的文本");
}