asp.net如何在图片上加水印文字具体实现(2)

/* This gets the size of the graphic so we can determine
             * the loop counts and placement of the watermarked text. */
            SizeF textSize = graphic.MeasureString(watermark, myFont);

//// Write the text across the image.
            //for (int y = 0; y < image.Height; y++)
            //{
            //    for (int x = 0; x < image.Width; x++)
            //    {
            //        PointF pointF = new PointF(x, y);
            //        graphic.DrawString(watermark, myFont, brush, pointF);
            //        x += Convert.ToInt32(textSize.Width);
            //    }
            //    y += Convert.ToInt32(textSize.Height);
            //}

            // Write the text at the right bottom of the image.
            for (int y = image.Height-25; y < image.Height; y++)
            {
                for (int x = image.Width-100; x < image.Width; x++)
                {
                    PointF pointF = new PointF(x, y);
                    graphic.DrawString(watermark, myFont, brush, pointF);
                    x += Convert.ToInt32(textSize.Width);
                }
                y += Convert.ToInt32(textSize.Height);
            }

using (MemoryStream memoryStream = new MemoryStream())
            {
                image.Save(memoryStream, GetImageFormat(context.Request.PhysicalPath));
                imageBytes = memoryStream.ToArray();
            }

}
        return imageBytes;
    }

#region IHttpHandler Members

public bool IsReusable
    {
        get { return false; }
    }

public void ProcessRequest(HttpContext context)
    {
        context.Response.Clear();
        context.Response.ContentType = GetContentType(context.Request.PhysicalPath);
        byte[] imageBytes = WatermarkImage(context);
        if (imageBytes != null)
        {
            context.Response.OutputStream.Write(imageBytes, 0, imageBytes.Length);
        }
        else
        {
            // No bytes = no image which equals NO FILE.   
            // Therefore send a 404 - not found response.
            context.Response.StatusCode = 404;
        }
        context.Response.End();
    }

#endregion
}

第二步，在web.config里添加如下代码：

复制代码 代码如下: