取字节[]图片，调整大小和显示在Asp.Net的mvc

Question

这是我的模型类

public class News: Public 
{ 
    [Key] 
    public int NewsID { get; set; } 

    [Required] 
    [StringLength(100, MinimumLength = 2)] 
    public string Title { get; set; } 

    [DataType(DataType.Date)] 
    [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)] 

    public DateTime NewsDate { get; set; } 

    [Required] 

    [DataType(DataType.MultilineText)] 
    [StringLength(1000, MinimumLength = 2)] 
    public string NewsTXT { get; set; } 

    public byte[] NewsPic { get; set; } 
} 

我用它在create控制器，用于Byte[]保存图片到数据库

using (var binaryReader = new BinaryReader(Request.Files[0].InputStream)) 
{ 
    news.NewsPic = binaryReader.ReadBytes(Request.Files[0].ContentLength); 
} 

我想让我的控制器中的图像的拇指，并显示在视图中，不希望任何地方保存拇指。

我想要做这样的事，但像从数据库

鉴于获取

缩略图控制器

public ActionResult Thumbnail(int width, int height){ 
var imageFile = Path.Combine(Server.MapPath("~/app_data"), "test.png"); 
using (var srcImage = Image.FromFile(imageFile)) 
using (var newImage = new Bitmap(width, height)) 
using (var graphics = Graphics.FromImage(newImage)) 
using (var stream = new MemoryStream()) 
{ 
    graphics.SmoothingMode = SmoothingMode.AntiAlias; 
    graphics.InterpolationMode = InterpolationMode.HighQualityBicubic; 
    graphics.PixelOffsetMode = PixelOffsetMode.HighQuality; 
    graphics.DrawImage(srcImage, new Rectangle(0, 0, width, height)); 
    newImage.Save(stream, ImageFormat.Png); 
    return File(stream.ToArray(), "image/png"); 
} 

}

<img src="@Url.Action("Thumbnail", "SomeController", new { width = 100, height = 50 })" alt="thumb" /> 

我这个代码的版本是，在拇指控制器中是：

public ActionResult Thumbnail(int width, int height,int id) 
    { 
     // TODO: the filename could be passed as argument of course 
     var photo = db.News.Find(id).NewsPic; 
     string imageBase64 = Convert.ToBase64String(photo); 
     var imageSrc = string.Format("data:image/jpg;base64,{0}", imageBase64); 

     using (var srcImage = Image.FromFile(imageSrc)) 
     using (var newImage = new Bitmap(width, height)) 
     using (var graphics = Graphics.FromImage(newImage)) 
     using (var stream = new MemoryStream()) 
     { 
      graphics.SmoothingMode = SmoothingMode.AntiAlias; 
      graphics.InterpolationMode = InterpolationMode.HighQualityBicubic; 
      graphics.PixelOffsetMode = PixelOffsetMode.HighQuality; 
      graphics.DrawImage(srcImage, new Rectangle(0, 0, width, height)); 
      newImage.Save(stream, ImageFormat.Png); 
      return File(stream.ToArray(), "image/png"); 
     } 
    } 

我的版本，鉴于：

 <img src="@Url.Action("Thumbnail", "News", new { width = 100, height = 50,id=Model.NewsID })" alt="thumb" /> 

但dosent工作

Answer 1

public ActionResult Thumbnail(int width, int height, int id){ 
     // TODO: the filename could be passed as argument of course 
     var photo = db.News.Find(id).NewsPic; 
     var base64 = Convert.ToBase64String(photo); 
     // Convert Base64 String to byte[] 
     byte[] imageBytes = Convert.FromBase64String(base64); 
     MemoryStream ms = new MemoryStream(imageBytes, 0, imageBytes.Length); 
     // Convert byte[] to Image 
     ms.Write(imageBytes, 0, imageBytes.Length); 
     Image image = Image.FromStream(ms, true); 

     using (var newImage = new Bitmap(width, height)) 
     using (var graphics = Graphics.FromImage(newImage)) 
     using (var stream = new MemoryStream()) 
     { 
      graphics.SmoothingMode = SmoothingMode.AntiAlias; 
      graphics.InterpolationMode = InterpolationMode.HighQualityBicubic; 
      graphics.PixelOffsetMode = PixelOffsetMode.HighQuality; 
      graphics.DrawImage(image, new Rectangle(0, 0, width, height)); 
      newImage.Save(stream, ImageFormat.Png); 
      return File(stream.ToArray(), "image/png"); 
     } 

    }