根据Winforms/C#中的文本和字体大小确定标签大小

using System.Drawing;
using System.Windows.Forms;

public class CustomLabel : Label
{
    public CustomLabel()
    {
        AutoSize = false;
    }

    protected override void OnTextChanged(EventArgs e)
    {
        base.OnTextChanged(e);
        SetLabelSize();
    }

    protected override void OnFontChanged(EventArgs e)
    {
        base.OnFontChanged(e);
        SetLabelSize();
    }

    private void SetLabelSize()
    {
        if (string.IsNullOrEmpty(Text))
        {
            return;
        }

        using (Graphics g = CreateGraphics())
        {
            SizeF textSize = g.MeasureString(Text, Font);
            Width = (int)textSize.Width;
            Height = (int)textSize.Height;
        }
    }
}