Base64Util.cs 304 Bytes

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using System;

namespace NCC.Core.Pay.Security
{
    public static class Base64Util
    {
        public static bool IsBase64String(string str)
        {
            Span<byte> buffer = stackalloc byte[str.Length];
            return Convert.TryFromBase64String(str, buffer, out _);
        }
    }
}