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asp.net mvc 從數(shù)據(jù)庫中讀取圖片的實現(xiàn)代碼

更新時間：2010年05月21日 02:23:57 作者：

今天搞了一天的MVC，在顯示圖片的時候老是出現(xiàn)問題，從網(wǎng)上搜索了好久，才找到解決方法。

首先是創(chuàng)建一個類，繼承于ActionResult，記住要引用System.Web.Mvc命名空間，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類中創(chuàng)建一個Action.如下：

復(fù)制代碼代碼如下:

 
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(); 
} 

這樣就可以顯示圖片了。
下面幾種方法可以顯示已經(jīng)存在的圖片
方法一：

復(fù)制代碼代碼如下:

 
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:

復(fù)制代碼代碼如下:

 
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：

復(fù)制代碼代碼如下:

 
[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"); 
} 

這三種都可以顯示已經(jīng)存在的圖片并且我認(rèn)為第三種方法可以修改為從數(shù)據(jù)庫中讀取圖片顯示。

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