asp.net mvc 從數據庫中讀取圖片的實現代碼

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類中創建一個Action.如下： 
 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存在的圖片 
方法一： 
 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: 
 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： 
 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存在的圖片并且我認為第三種方法可以修改為從數據庫中讀取圖片顯示。
 
 




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