asp.net mvc 從資料庫中讀取圖片的實現代碼

首先是建立一個類，繼承於ActionResult，記住要引用System.Web.Mvc命名空間，如下： 複製代碼 代碼如下: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);
}
}
}

然後在 Controller類中建立一個Action.如下： 複製代碼 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存在的圖片
方法一： 複製代碼 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: 複製代碼 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： 複製代碼 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存在的圖片並且我認為第三種方法可以修改為從資料庫中讀取圖片顯示。