.net生成水印和缩略图

• 引用NuGet ：CodeCarvings.Piczard 

        /// <summary>
        /// 生成缩略图
        /// </summary>
        /// <param name="imageWidth">图片宽</param>
        /// <param name="imageHigh">图片高</param>
        /// <param name="sourePath">原图</param>
        /// <param name="savePath">保存路径</param>
        private static void CreateThumbnail(int imageWidth, int imageHigh, string sourePath, string savePath)
        {
            ImageProcessingJob ipj = new ImageProcessingJob();
            ipj.Filters.Add(new FixedResizeConstraint(imageWidth, imageHigh)); //
            ipj.SaveProcessedImageToFileSystem(sourePath, savePath, new JpegFormatEncoderParams());  
        }
        /// <summary>
        /// 生成水印
        /// </summary>
        /// <param name="imageWidth">生成后图片宽度</param>
        /// <param name="imageHigh">生成后图片高度</param>
        /// <param name="markimage">水印图</param>
        /// <param name="sourePath">原图*（需要添加水印的图片）</param>
        /// <param name="savePath">生成路径</param>
        private static void CreateThumbnail(int? imageWidth, int? imageHigh,string markimage, string sourePath, string savePath)
        {
            ImageWatermark mark = new ImageWatermark(markimage);
            mark.ContentAlignment = System.Drawing.ContentAlignment.BottomRight;
            mark.Alpha = 50;
            ImageProcessingJob job = new ImageProcessingJob();
            job.Filters.Add(mark);
            if (!imageWidth.HasValue && !imageHigh.HasValue)
            {
                job.Filters.Add(new FixedResizeConstraint(imageWidth.Value, imageHigh.Value));
            }    
            job.SaveProcessedImageToFileSystem(sourePath, savePath, new JpegFormatEncoderParams());

        }

效果：

生成验证码：

       /// <summary>
        /// 生成验证码
        /// </summary>
        /// <param name="verificationCode">验证码字符串</param>
        /// <param name="width">图片宽度</param>
        /// <param name="hight">图片高度</param>
        /// <param name="Fontsize">字体大小</param>
        /// <param name="degree">模糊度</param>
        /// <param name="SavePath">保存路径</param>
        public static void GetVerificationCode(string verificationCode,int width,int hight,int Fontsize,int degree,string SavePath)
        {
            using (MemoryStream ms = ImageFactory.GenerateImage(verificationCode, width, hight, Fontsize, degree))
            using (FileStream fs=File.OpenWrite(SavePath))
            {
                ms.CopyTo(fs);
            }
        }

来自B站：逆风微笑代码狗 

https://www.bilibili.com/video/BV1Wb411G7yk