C#工具:WPF生成圖片驗證碼

1.使用ImageFormatConvertHelper

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;

namespace YongAn_WPF
{
    public class ImageFormatConvertHelper
    {
        [DllImport("gdi32.dll", SetLastError = true)]
        private static extern bool DeleteObject(IntPtr hObject);
        /// <summary>  /// 
        /// 從bitmap轉換成ImageSource  /// 
        /// </summary>  /// 
        /// <param name="icon"></param>
        /// <returns></returns>  
        public static ImageSource ChangeBitmapToImageSource(Bitmap bitmap)
        { //Bitmap bitmap = icon.ToBitmap();  
            IntPtr hBitmap = bitmap.GetHbitmap();
            ImageSource wpfBitmap = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(hBitmap, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
            if (!DeleteObject(hBitmap))
            { throw new System.ComponentModel.Win32Exception(); }
            return wpfBitmap;
        }
    }
}

2.使用VerifyCodeHelper

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace YongAn_WPF
{
    public class VerifyCodeHelper
    {
        public static Bitmap CreateVerifyCode(out string code)
        { //建立Bitmap對象，繪圖 
            Bitmap bitmap = new Bitmap(200, 60); Graphics graph = Graphics.FromImage(bitmap);
            graph.FillRectangle(new SolidBrush(Color.White), 0, 0, 200, 60);
            Font font = new Font(FontFamily.GenericSerif, 48, FontStyle.Bold, GraphicsUnit.Pixel);
            Random r = new Random(); string letters = "ABCDEFGHIJKLMNPQRSTUVWXYZ0123456789";
            StringBuilder sb = new StringBuilder();
            //添加隨機的五個字母
            for (int x = 0; x < 5; x++)
            {
                string letter = letters.Substring(r.Next(0, letters.Length - 1), 1);
                sb.Append(letter);
                graph.DrawString(letter, font, new SolidBrush(Color.Black), x * 38, r.Next(0, 15));
            }
            code = sb.ToString();
            //混淆背景
            Pen linePen = new Pen(new SolidBrush(Color.Black), 2);
            for (int x = 0; x < 6; x++) graph.DrawLine(linePen, new Point(r.Next(0, 199), r.Next(0, 59)), new Point(r.Next(0, 199), r.Next(0, 59)));
            return bitmap;
        }
    }
}

3.調用方式 返回Code(驗證碼內容)

        public string GetImage()
        {
            string code = "";
            Bitmap bitmap = VerifyCodeHelper.CreateVerifyCode(out code);
            ImageSource imageSource = ImageFormatConvertHelper.ChangeBitmapToImageSource(bitmap);
            img.Source = imageSource;
            return code;
        }