调整TextBox的大小，以便在调整控件大小时正确显示字体

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

public class Form1 : Form
{
    private TextBox textBox1;

    public Form1()
    {
        InitializeComponent();
    }

    private void InitializeComponent()
    {
        this.textBox1 = new TextBox();
        this.SuspendLayout();
        // 
        // textBox1
        // 
        this.textBox1.AutoSize = false;
        this.textBox1.Font = new Font("Arial", 12f, FontStyle.Regular, GraphicsUnit.Point, ((byte)(0)));
        this.textBox1.Location = new Point(50, 50);
        this.textBox1.Multiline = true;
        this.textBox1.Name = "textBox1";
        this.textBox1.Size = new Size(200, 100);
        this.textBox1.TabIndex = 0;
        this.textBox1.Text = "Sample Text";
        this.textBox1.Resize += new EventHandler(this.textBox1_Resize);
        // 
        // Form1
        // 
        this.AutoScaleDimensions = new SizeF(6f, 13f);
        this.AutoScaleMode = AutoScaleMode.Font;
        this.ClientSize = new Size(300, 200);
        this.Controls.Add(this.textBox1);
        this.Name = "Form1";
        this.Text = "TextBox Resize";
        this.ResumeLayout(false);
    }

    private void textBox1_Resize(object sender, EventArgs e)
    {
        TextBox textBox = (TextBox)sender;
        Graphics graphics = textBox.CreateGraphics();
        SizeF textSize = graphics.MeasureString(textBox.Text, textBox.Font);
        textBox.Width = (int)textSize.Width + 10; // 加上一些额外的空间
        textBox.Height = (int)textSize.Height + 10;
    }

    public static void Main()
    {
        Application.Run(new Form1());
    }
}