Render image to the screen from MVC controller

Question

I have images in the database and I want to return the image for viewing from an action. Here\'s my action.

public FileContentResult Index(ItemImageRequest          


        

Answer 1

As requested, here is my solution.

Here is the ImageResult class, copied and modified from John

public class ImageResult : ActionResult
{
    public ImageResult()
    {
    }

    public byte[] ImageData
    {
        get;
        set;
    }

    public MemoryStream ImageStream
    {
        get;
        set;
    }

    public string MimeType
    {
        get;
        set;
    }

    public HttpCacheability Cacheability
    {
        get;
        set;
    }

    public string ETag
    {
        get;
        set;
    }

    public DateTime? Expires
    {
        get;
        set;
    }

    public override void ExecuteResult(ControllerContext context)
    {
        if (this.ImageData == null && ImageStream == null)
        {
            throw new ArgumentNullException("ImageData or ImageStream");
        }

        if (string.IsNullOrEmpty(this.MimeType))
        {
            throw new ArgumentNullException("MimeType");
        }

        context.HttpContext.Response.ContentType = this.MimeType;

        if (!string.IsNullOrEmpty(this.ETag))
        {
            context.HttpContext.Response.Cache.SetETag(this.ETag);
        }

        if (this.Expires.HasValue)
        {
            context.HttpContext.Response.Cache.SetCacheability(this.Cacheability);
            context.HttpContext.Response.Cache.SetExpires(this.Expires.Value);
        }

        if (ImageStream != null)
        {
            ImageData = ImageStream.ToArray();
        } 

        context.HttpContext.Response.OutputStream.Write(this.ImageData, 0, this.ImageData.Length);

    }
}

Here is my action, modified for clarity

public ActionResult Index(ItemImageRequest request)
{
    var result = queueService.GetItemImage(request);

    if (result.TotalResults == 0)
        return new EmptyResult();

    ItemImage image = result.FirstResult;

    //image.Image is type byte[]
    MemoryStream tiffStream = new MemoryStream(image.Image);

    MemoryStream pngStream = new MemoryStream();

    System.Drawing.Bitmap.FromStream(tiffStream).Save(pngStream, System.Drawing.Imaging.ImageFormat.Png);

    return new ImageResult()
    {
        ImageStream = pngStream,
        MimeType = "image/png",
        Cacheability = HttpCacheability.NoCache
    };
}

Thanks to John and Will for helping me out with this.