VberAdmin_V4/SourceCode/Zero/VberYue.Zero/Tools/ImageFormatHelper.cs

using SixLabors.ImageSharp;

namespace VberZero.Tools;

public class ImageFormatHelper
{
    public static string GetRawImageFormat(byte[] fileBytes)
    {
        using var image = Image.Load(fileBytes, out var format);
        return format.FileExtensions.First();
    }
}