[C#]列舉(enum)的使用

Code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        enum Shape : int
        {
            Circle=0,
            Line=1,
            Arc=2
        }

        private void Draw(int vType)
        {
            Graphics g;
            Pen p = new Pen(Color.Red);
            g = this.CreateGraphics();
            g.Clear(Color.White);

            switch (vType)
            {
                case    0:
                    g.DrawEllipse(p, 90, 30, 90, 90);
                    break;
                case    1:
                    g.DrawLine(p, 90, 50, 180, 100);
                    break;
                case    2:
                    g.DrawArc(p, 90, 30, 90, 90, 0, 250);
                    break;

                default:
                    MessageBox.Show("沒這個喔");
                    break;
            }
        }

        private void Draw(Shape vType)
        {
            Graphics g;
            Pen p = new Pen(Color.Red);
            g = this.CreateGraphics();
            g.Clear(Color.White);

            switch (vType)
            {
                case Shape.Circle:
                    g.DrawEllipse(p, 60, 30, 90, 90);
                    break;
                case Shape.Line:
                    g.DrawLine(p, 60, 50, 180, 100);
                    break;
                case Shape.Arc:
                    g.DrawArc(p, 60, 30, 90, 90, 0, 250);
                    break;

                default:
                    MessageBox.Show("沒這個喔");
                    break;
            }
        }

        private void BTN_Circle_Click(object sender, EventArgs e)
        {
            //Draw(0);
            Draw(Shape.Circle);
        }

        private void BTN_LINE_Click(object sender, EventArgs e)
        {
            //Draw(1);
            Draw(Shape.Line);
        }

        private void BTN_Arc_Click(object sender, EventArgs e)
        {
            //Draw(2);
            Draw(Shape.Arc);
        }
    }
}