错误 System.EntryPointNotFoundException: Mono_Posix_Stdlib_free C# Mono

我正在尝试在 Raspberry Pi 上使用 i2c 总线。找到要使用的包装器。错误 System.EntryPointNotFoundException: Mono_Posix_Stdlib_free C# Mono。通过链接i2c 包装器的包装器

  using Mono.Unix.Native;
  using Mono.Unix;

  [DllImport("libc.so.6", EntryPoint = "ioctl", SetLastError = true)]
    extern private static int ioctl(int fd, int request, byte x);

  byte[] bytes;
        using (var i2cBus = new I2CBus(bus))
        {
            var i2cDevice = new I2CDevice(i2cBus, 0x22);

            log.Debug($"{i2cDevice.ToString()} Device");

            System.Console.WriteLine($"{i2cDevice.Address} address");
            log.Debug($"{i2cDevice.Address} address");
            System.Console.WriteLine($"{i2cDevice.ReadByte(0x00)} Data");
            log.Debug($"{i2cDevice.ReadByte(0x00)} Data");

        }

只要调用 ReadByte（或库中的任何其他方法），就会发生此错误。这是从库中读取字节的方法

 public unsafe byte ReadBytes(byte devAddr, byte regAddr, byte length, byte[] data, int offset=0, ushort timeout = 0)
    {
        if (length > 127)
            throw new IOException(_device + ": length > 127");

        //TODO: break this up so that we can await on all 3  native calls
        ChangeDevice(devAddr);

        //fixed(byte* p = &regAddr)
        {
            int ret = (int)Syscall.write(_fd, &regAddr, 1);
            if (ret != 1)
            {
                CheckAndThrowUnixIOException();
            }
        }

        int count;
        fixed (byte* p = &data[offset])
        {
            count = (int)Syscall.read(_fd, p, (ulong)length);
            if (count < 0)
            {
                CheckAndThrowUnixIOException();
            }
            else if (count != length)
            {
                throw new IOException(_device + ": read short: length = " + length + " > " + count);
            }
        }

        return (byte)count;
    }

我试图复制在构建期间创建的库（Mono.Posix.dll）并将其替换到 /usr/lib/mono/4.0-api 文件夹中/它没有帮助。接下来看哪里？