抽奖系统简单demo

之前有博友问过这个怎么做，恰巧一个同事也问。顺带做个demo
思路：
重写onpaint方法将数字（因为是画的，所以数字可以使用一些漂亮的图片）画到背景透明的控件上面。

具体看代码。

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
using System.IO;
using System.ComponentModel;
using System.Runtime.InteropServices;

namespace TicketsBonus
{
    public class TicketsBonusLabel : Control, IDisposable
    {
        public TicketsBonusLabel() {
            this.SetStyle(ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint | ControlStyles.DoubleBuffer | ControlStyles.ResizeRedraw, true);
            this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);
            this.UpdateStyles();
            srcMap = new Dictionary<int, Bitmap>();
            InitializeBackground();
        }

        private Dictionary<int, Bitmap> srcMap;

        [Browsable(false),DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        public Dictionary<int, Bitmap> SrcMap
        {
            get { return srcMap; }
            set { srcMap = value; }
        }

        void InitializeBackground() {
            string path = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "number");
            for (int i = 0; i < 10; i++)
            {
                string file = Path.Combine(path, i.ToString() + ".png");
                if (File.Exists(file)) {
                    Bitmap map = Bitmap.FromFile(file) as Bitmap;
                    if (map != null)
                    {
                        this.srcMap.Add(i, map);
                    }
                }
            }
        }

        private long _value = 13588886666;
        [DefaultValue(13588886666)]
        public long Value {
            get {
                return _value;
            }
            set {
                if (value < 0) {
                    throw new Exception();
                }
                _value = value;
            }
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            if (this.BackColor != Color.Transparent) {
                this.BackColor = Color.Transparent;
            }
            List<int> value = new List<int>();
            foreach (char c in this.Value.ToString().PadLeft(11,'0'))
            {
                int v = -1;
                int.TryParse(c.ToString(), out v);
                value.Add(v);
            }

            int x, y = 0;
            int i = 0;
            foreach (int item in value)
            {
                x = 64 * i;
                if (srcMap.ContainsKey(item))
                {
                    Bitmap map = srcMap[item];
                    e.Graphics.DrawImage(map, new Rectangle(x, 0, 64, 64));
                }
                else {
                    e.Graphics.DrawString(item.ToString(), this.Font, Brushes.Black, new Point(x, 0));
                }
                i++;
            }
        }

        public new void Dispose() {
            foreach (Bitmap m in srcMap.Values)
            {
                m.Dispose();
            }
            srcMap.Clear();
        }
    }
}

 

demo代码：

https://files.cnblogs.com/5yplan/TicketsBonus.rar

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