Water Marked 水印

from : Pro ASPnetMVCFramework

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.Mvc;

using System.Drawing;

using System.Drawing.Imaging;

using System.IO;



namespace TestMvcWebApp1.ActionResultEx

{

    public class WatermarkedImageResult : ActionResult

    {

        public WatermarkedImageResult() { }

        public string ImageFileName { get; private set; }

        public string WatermarkText { get; private set; }

        public WatermarkedImageResult(string imageFileName, string watermarkText)

        {

            ImageFileName = imageFileName;

            WatermarkText = watermarkText;

        }

        public override void ExecuteResult(ControllerContext context)

        {

            using (var image = Image.FromFile(ImageFileName))

            using (var graphics = Graphics.FromImage(image))

            using (var font = new Font("Arial", 10))

            using (var memoryStream = new MemoryStream())

            {

                // Render the watermark text in bottom-left corner

                var textSize = graphics.MeasureString(WatermarkText, font);

                graphics.DrawString(WatermarkText, font, Brushes.Black, 10,

                    image.Height - textSize.Height - 10);

                // Transmit the image in PNG format (note: must buffer it in

                // memory first due to GDI+ limitation)284 CHAPTER 9 n CONTROLLERS AND ACTIONS

                image.Save(memoryStream, ImageFormat.Png);

                var response = context.RequestContext.HttpContext.Response;

                response.ContentType = "image/png";

                response.BinaryWrite(memoryStream.GetBuffer());

            }

        }

    }

}

使用：

 public ActionResult ViewmarkedImage()

        {



            string ImageFileName = @"C:\Documents and Settings\Administrator\My Documents\My Pictures\oem.gif";

            string WatermarkText = "这是我的水印";

            WatermarkedImageResult result = new WatermarkedImageResult(ImageFileName, WatermarkText);

            return result;

        }