C# 给图片加图片或文字水印

图片加水印是我们做网站的经常使用的功能，下面的代码可以给图片加上图片水印或者文字水印，不过只是简单的实现，不能像专业软件水印效果那么好，代码如下：

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/// <summary> /// 对一个指定的图片加上图片水印效果。 /// </summary> /// <param name="imageFile">图片文件地址</param> /// <param name="waterImage">水印图片（Image对象）</param> public static void CreateImageWaterMark(string imageFile, System.Drawing.Image waterImage) {     if (string.IsNullOrEmpty(imageFile) || !File.Exists(imageFile) || waterImage == null)     {         return;     }     System.Drawing.Image originalImage = System.Drawing.Image.FromFile(imageFile);     if (originalImage.Width - 10 < waterImage.Width || originalImage.Height - 10 < waterImage.Height)     {         return;     }     Graphics graphics = Graphics.FromImage(originalImage);     int x = originalImage.Width - waterImage.Width - 10;     int y = originalImage.Height - waterImage.Height - 10;     int width = waterImage.Width;     int height = waterImage.Height;     graphics.DrawImage(waterImage, new Rectangle(x, y, width, height), 0, 0, width, height, GraphicsUnit.Pixel);     graphics.Dispose();     MemoryStream stream = new MemoryStream();     originalImage.Save(stream, ImageFormat.Jpeg);     originalImage.Dispose();     System.Drawing.Image imageWithWater = System.Drawing.Image.FromStream(stream);     imageWithWater.Save(imageFile);     imageWithWater.Dispose(); } /// <summary> /// 对一个指定的图片加上文字水印效果。 /// </summary> /// <param name="imageFile">图片文件地址</param> /// <param name="waterText">水印文字内容</param> public static void CreateTextWaterMark(string imageFile, string waterText) {     if (string.IsNullOrEmpty(imageFile) || string.IsNullOrEmpty(waterText) || !File.Exists(imageFile))     {         return;     }     System.Drawing.Image originalImage = System.Drawing.Image.FromFile(imageFile);     Graphics graphics = Graphics.FromImage(originalImage);     graphics.SmoothingMode = SmoothingMode.HighQuality;     graphics.TextRenderingHint = TextRenderingHint.ClearTypeGridFit;     graphics.CompositingQuality = CompositingQuality.HighQuality;     graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;     SolidBrush brush = new SolidBrush(Color.FromArgb(153, 255, 255, 255));     Font waterTextFont = new Font("Arial", 16, FontStyle.Regular);     SizeF waterTextSize = graphics.MeasureString(waterText, waterTextFont);     float x = (float)originalImage.Width - waterTextSize.Width - 10F;     float y = (float)originalImage.Height - waterTextSize.Height - 10F;     graphics.DrawString(waterText, waterTextFont, brush, x, y);     graphics.Dispose();     brush.Dispose();     MemoryStream stream = new MemoryStream();     originalImage.Save(stream, ImageFormat.Jpeg);     originalImage.Dispose();     System.Drawing.Image imageWithWater = System.Drawing.Image.FromStream(stream);     imageWithWater.Save(imageFile);     imageWithWater.Dispose(); }