Convert Base64 String to Bitmap or Image Xamarin or Android

Question

I'm trying to convert a Base64 string to an image and set ImageView using the same image. I know how to get it done in java, but I'm having a trouble in C#. Anyone have an idea of how to get it done in C#?

Some of the code I've tried;

public Image Base64ToImage(string base64String)
 {
    // Convert base 64 string to byte[]
    byte[] imageBytes = Convert.FromBase64String(base64String);
    // Convert byte[] to Image
    using (var ms = new MemoryStream(imageBytes, 0, imageBytes.Length))
    {
        Image image = Image.FromStream(ms, true);
        return image;
    }
 }

Yksh · Accepted Answer · 2016-05-02T05:49:09.830

Base64 to Bitmap :

public Bitmap Base64ToBitmap(String base64String)
{
    byte[] imageAsBytes = Base64.Decode(base64String, Base64Flags.Default);
    return BitmapFactory.DecodeByteArray(imageAsBytes, 0, imageAsBytes.Length);
}

Bitmap to Base64 :

public String BitmapToBase64(Bitmap bitmap)
{
    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
    bitmap.Compress(Bitmap.CompressFormat.Png, 100, byteArrayOutputStream);
    byte[] byteArray = byteArrayOutputStream.ToByteArray();
    return Base64.EncodeToString(byteArray, Base64Flags.Default);
}

score 4 · Answer 2 · answered May 02 '16 at 02:01

Image to Base64 String, online conversion - here

 public string ImageToBase64(Image image, 
  System.Drawing.Imaging.ImageFormat format)
{
  using (MemoryStream ms = new MemoryStream())
  {
    // Convert Image to byte[]
    image.Save(ms, format);
    byte[] imageBytes = ms.ToArray();

    // Convert byte[] to Base64 String
    string base64String = Convert.ToBase64String(imageBytes);
    return base64String;
  }
}

Base64 String to Image, online conversion - here

    public Image Base64ToImage(string base64String)
{
  // Convert Base64 String to byte[]
  byte[] imageBytes = Convert.FromBase64String(base64String);
  MemoryStream ms = new MemoryStream(imageBytes, 0, 
    imageBytes.Length);

  // Convert byte[] to Image
  ms.Write(imageBytes, 0, imageBytes.Length);
  Image image = Image.FromStream(ms, true);
  return image;
}

Hi, Vishwesh I've tried this code, i get the following error ; 'Image' does not contain a definition for 'FromStream' . Im using Visual Studio 2015 By the way. — Joewy Lombe, May 02 '16 at 02:08
`MemoryStream ms = new MemoryStream(imageBytes);` is enough. You don't need to `Write` to it. In this form, you must also set the position to 0 before passing to FromStream — Vishwesh Jainkuniya, May 02 '16 at 02:41

score 3 · Answer 3 · answered May 02 '16 at 02:53

I'm assuming that your encoded data is some bitmap format? If so, you should be able to do something like this:

public Bitmap Base64ToImage(string base64String)
 {
    // Convert base 64 string to byte[]
    byte[] imageBytes = Convert.FromBase64String(base64String);
    // Convert byte[] to Image
    using (var ms = new MemoryStream(imageBytes, 0, imageBytes.Length))
    {
        Bitmap image = BitmapFactory.FromStream(ms, true);
        return image;
    }
 }

Convert Base64 String to Bitmap or Image Xamarin or Android

3 Answers3

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