C# Base64 String to JPEG Image

Question

I am trying to convert a Base64String to an image which needs to be saved locally.

At the moment, my code is able to save the image but when I open the saved image, it says "Invalid Image".

Code:

try
{
    using (var imageFile = new StreamWriter(filePath))
    {
        imageFile.Write(resizeImage.Content);
        imageFile.Close();
    }
}

The Content is a string object which contains the Base64 String.

Answer 1

First, convert the base 64 string to an Image, then use the Image.Save method.

To convert from base 64 string to Image:

 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;
    }
 }

To convert from Image to base 64 string:

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 base 64 string
    string base64String = Convert.ToBase64String(imageBytes);
    return base64String;
  }
}

Finally, you can easily to call Image.Save(filePath); to save the image.