C# MVC 5 display dynamic binary image as base64

Question

OK. I have a basic MVC5 web app. I store images as binary in SQL DB. All good so far.

I can upload different image types: png, jpg, gif ...

My question when I read the image (binary from db) and show it, how can I dynamically format the data:image/gif;base64,XXXXXXXXXXXXXXXXXXXXXXXXX ?

More exactly, how can I get the it's type, image/gif or image/png or image/jpg ... from that binary image?

Backs · Accepted Answer · 2015-11-07 10:42:27Z

1

Using ImageCodecInfo:

byte[] bytes; //get from DB
...
using (var ms = new System.IO.MemoryStream(bytes)) 
{
    using(var img = Image.FromStream(ms)) 
    {
        var type = GetMimeType(img);
    }
}

public static string GetMimeType(Bitmap image)
{
    var type = ImageCodecInfo.GetImageDecoders().FirstOrDefault(codec => codec.FormatID == image.RawFormat.Guid);

    return type != null ? type.MimeType : "image/unknown";
}

answered Nov 7, 2015 at 10:42

Backs

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