StringFormat 为何没起作用

StringFormat 为什么没起作用

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;

namespace WindowsFormsApplication8
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
    }

    public enum States
    {
        Normal,
        Pushed,
        Poped
    }

    public class CustomButton : Button
    {
        protected override void OnPaint(PaintEventArgs pevent)
        {

            Graphics g = pevent.Graphics;

            int X = this.Width;
            int Y = this.Height;
            Point[] points = {  
                                new Point(0, 0), 
                                new Point(X, 0), 
                                new Point(X, Y), 
                                new Point(0, Y), 
                                new Point(0, 0)};

            GraphicsPath path = new GraphicsPath();
            path.AddLines(points);
            this.Region = new Region(path);

            SolidBrush sBrush = new SolidBrush(SystemColors.Control);
            g.FillPath(sBrush, path);

            g.DrawLine(new Pen(Color.Black), 0, 0, this.Width-1, 0);
            g.DrawLine(new Pen(Color.Black), this.Width-1, 0, this.Width-1, this.Height-1);
            g.DrawLine(new Pen(Color.Black), this.Width-1, this.Height-1, 0, this.Height-1);
            g.DrawLine(new Pen(Color.Black), 0, this.Height-1, 0, 0);
            


            if (this.Text != "")
            {

                StringFormat stringFormat = new StringFormat();
                switch (this.TextAlign)
                {
                    case ContentAlignment.MiddleCenter:
                        stringFormat.LineAlignment = StringAlignment.Center;
                        stringFormat.Alignment = StringAlignment.Center;
                        break;
                    case ContentAlignment.MiddleRight:
                        stringFormat.LineAlignment = StringAlignment.Far;
                        stringFormat.Alignment = StringAlignment.Center;
                        break;
                    default: break;
                }

                SolidBrush drawBrush = new SolidBrush(Color.Black);

                Size s = TextRenderer.MeasureText(this.Text, this.Font);
                RectangleF rectf = new Rectangle(Point.Empty, s);

                g.DrawString(this.Text, this.Font, drawBrush, rectf, stringFormat);
            }
        }
    }
}

为什么Button的Text文字，设置TextAlign = MiddleRight 一点作用都没呢，StringFormat 为什么没起作用
------解决思路----------------------
// 可以去掉以下两行。你计算出一个紧贴的外框，如何有空间让内容在外框内上下左右对齐？
// Size s = TextRenderer.MeasureText(this.Text, this.Font);
// RectangleF rectf = new Rectangle(Point.Empty, s);
 
g.DrawString(this.Text, this.Font, drawBrush, this.ClientRectangle, stringFormat);
------解决思路----------------------
你上下两个分支都是
stringFormat.Alignment = StringAlignment.Center;
当然都一样。