首页 > 代码库 > [转]asp.net mvc 从数据库中读取图片
[转]asp.net mvc 从数据库中读取图片
本文转自:http://www.cnblogs.com/mayt/archive/2010/05/20/1740358.html
首先是创建一个类,继承于ActionResult,记住要引用System.Web.Mvc命名空间,如下:public class ImageResult : ActionResult { public ImageFormat ContentType { get; set; } public Image image { get; set; } public string SourceName { get; set; } public ImageResult(string _SourceName, ImageFormat _ContentType) { this.SourceName = _SourceName; this.ContentType = _ContentType; } public ImageResult(Image _ImageBytes, ImageFormat _ContentType) { this.ContentType = _ContentType; this.image = _ImageBytes; } public override void ExecuteResult(ControllerContext context) { context.HttpContext.Response.Clear(); context.HttpContext.Response.Cache.SetCacheability(HttpCacheability.NoCache); if (ContentType.Equals(ImageFormat.Bmp)) context.HttpContext.Response.ContentType = "image/bmp"; if (ContentType.Equals(ImageFormat.Gif)) context.HttpContext.Response.ContentType = "image/gif"; if (ContentType.Equals(ImageFormat.Icon)) context.HttpContext.Response.ContentType = "image/vnd.microsoft.icon"; if (ContentType.Equals(ImageFormat.Jpeg)) context.HttpContext.Response.ContentType = "image/jpeg"; if (ContentType.Equals(ImageFormat.Png)) context.HttpContext.Response.ContentType = "image/png"; if (ContentType.Equals(ImageFormat.Tiff)) context.HttpContext.Response.ContentType = "image/tiff"; if (ContentType.Equals(ImageFormat.Wmf)) context.HttpContext.Response.ContentType = "image/wmf"; if (image != null) { image.Save(context.HttpContext.Response.OutputStream, ContentType); } else { context.HttpContext.Response.TransmitFile(SourceName); } } }然后在 Controller类中创建一个Action.如下:public ActionResult GetPicture(int id) { ICategory server = new CategoryServer(); byte[] buffer = server.getCategoryPicture(id); if (buffer != null) { MemoryStream stream = new MemoryStream(buffer); System.Drawing.Image image = System.Drawing.Image.FromStream(stream); ImageResult result = new ImageResult(image, System.Drawing.Imaging.ImageFormat.Jpeg); return result; } return View(); } 这样就可以显示图片了。 下面几种方法可以显示已经存在的图片 方法一: using System.IO;public FileResult Image() { string path = Server.MapPath("/Content/Images/Decorative/"); string filename = Request.Url.Segments[Request.Url.Segments.Length - 1].ToString(); // Uss Path.Combine from System.IO instead of StringBuilder. string fullPath = Path.Combine(path, filename); return(new FileResult(fullPath, "image/jpeg"));}方法二:public ActionResult Image(string id){ var dir = Server.MapPath("/Images"); var path = Path.Combine(dir, id + ".jpg"); return base.File(path, "image/jpg");}方法三:[AcceptVerbs(HttpVerbs.Get)][OutputCache(CacheProfile = "CustomerImages")]public FileResult Show(int customerId, string imageName){ var path = string.Concat(ConfigData.ImagesDirectory, customerId, @"\", imageName); return new FileStreamResult(new FileStream(path, FileMode.Open), "image/jpeg");}这三种都可以显示已经存在的图片并且我认为第三种方法可以修改为从数据库中读取图片显示。
声明:以上内容来自用户投稿及互联网公开渠道收集整理发布,本网站不拥有所有权,未作人工编辑处理,也不承担相关法律责任,若内容有误或涉及侵权可进行投诉: 投诉/举报 工作人员会在5个工作日内联系你,一经查实,本站将立刻删除涉嫌侵权内容。