public class TxtWaterMark

    {

        public enum WaterPositionMode

        {

            LeftTop,//左上

            LeftBottom,//左下

            RightTop,//右上

            RightBottom,//右下

            Center,//中间

            Other//其他,若选此项AddWaterText方法内自己把xValue和yValue穿进去

        }

        /// <summary>

        /// 给图片加文字水印

        /// </summary>

        /// <param name="oldpath">图片地址</param>

        /// <param name="savepath">加上文字水印以后图片保存地址</param>

        /// <param name="watertext">水印文字</param>

        /// <param name="position">水印位置</param>

        /// <param name="fontName">水印文字字体</param>

        /// <param name="fontSize">水印文字大小</param>

        /// <param name="color">水印文字颜色</param>

        /// <param name="alpha">水印文字透明度</param>

        /// <param name="isBold">水印文字是否加粗</param>

        /// <param name="xValue">水印位置position Other选项下设置</param>

        /// <param name="yValue">水印位置position Other选项下设置</param>

        public static void AddWaterText(string oldpath, string savepath, string watertext, WaterPositionMode position, string fontName, int fontSize, string fontColor, int alpha, bool isBold, float xValue = , float yValue = )

        {

            Image image = Image.FromFile(oldpath);

            Bitmap bitmap = new Bitmap(image.Width, image.Height);

            Graphics graphics = Graphics.FromImage(bitmap);

            graphics.Clear(Color.White);

            graphics.DrawImage(image, new Rectangle(, , image.Width, image.Height), , , image.Width, image.Height, GraphicsUnit.Pixel);

            Font font = new Font(fontName, fontSize, FontStyle.Bold);

            if (!isBold)

            {

                font = new Font(fontName, fontSize);

            }

            SizeF ziSizeF = new SizeF();

            ziSizeF = graphics.MeasureString(watertext, font);

            float x = 0f;

            float y = 0f;

            switch (position)

            {

                case WaterPositionMode.LeftTop:

                    x = ziSizeF.Width / 2f;

                    y = 0f;

                    break;

                case WaterPositionMode.LeftBottom:

                    x = ziSizeF.Width / 2f;

                    y = image.Height - ziSizeF.Height;

                    break;

                case WaterPositionMode.RightTop:

                    x = image.Width * 1f - ziSizeF.Width / 2f;

                    y = 0f;

                    break;

                case WaterPositionMode.RightBottom:

                    x = image.Width - ziSizeF.Width;

                    y = image.Height - ziSizeF.Height;

                    break;

                case WaterPositionMode.Center:

                    x = image.Width / ;

                    y = image.Height /  - ziSizeF.Height / ;

                    break;

                case WaterPositionMode.Other:

                    x = xValue + ziSizeF.Width / 2f;

                    y = yValue;

                    break;

            }

            try

            {

                StringFormat stringFormat = new StringFormat { Alignment = StringAlignment.Center };

                SolidBrush solidBrush = new SolidBrush(Color.FromArgb(alpha <  ?  : alpha, , , ));

                graphics.DrawString(watertext, font, solidBrush, x + 1f, y + 1f, stringFormat);

                SolidBrush brush = new SolidBrush(Color.FromArgb(alpha <  ?  : alpha, ColorTranslator.FromHtml(fontColor)));

                graphics.DrawString(watertext, font, brush, x, y, stringFormat);

                solidBrush.Dispose();

                brush.Dispose();

                bitmap.Save(savepath, ImageFormat.Png);

            }

            catch (Exception e)

            {

            }

            finally

            {

                bitmap.Dispose();

                image.Dispose();

            }

        }

    }