C#工具:WPF生成图片验证码

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>  ///
        /// 从bitmap转换成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对象，绘图
            Bitmap bitmap = new Bitmap(, ); Graphics graph = Graphics.FromImage(bitmap);
            graph.FillRectangle(new SolidBrush(Color.White), , , , );
            Font font = new Font(FontFamily.GenericSerif, , FontStyle.Bold, GraphicsUnit.Pixel);
            Random r = new Random(); string letters = "ABCDEFGHIJKLMNPQRSTUVWXYZ0123456789";
            StringBuilder sb = new StringBuilder();
            //添加随机的五个字母
            for (int x = ; x < ; x++)
            {
                string letter = letters.Substring(r.Next(, letters.Length - ), );
                sb.Append(letter);
                graph.DrawString(letter, font, new SolidBrush(Color.Black), x * , r.Next(, ));
            }
            code = sb.ToString();
            //混淆背景
            Pen linePen = new Pen(new SolidBrush(Color.Black), );
            for (int x = ; x < ; x++) graph.DrawLine(linePen, new Point(r.Next(, ), r.Next(, )), new Point(r.Next(, ), r.Next(, )));
            return bitmap;
        }
    }
}

3.调用方式 返回Code(验证码内容)

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