C# - Error CS4033 - The 'await' operator can only be used within an async method

Question

Visual Studio Community 2022 failed to build the following code with C# - Error CS4033 - The 'await' operator can only be used within an async method.
Do you have any suggestion to fix this issue?

// in BluetoothDevicePairing\src\Bluetooth\Service\NusService.cs
using Windows.Devices.Bluetooth;
using Windows.Devices.Bluetooth.GenericAttributeProfile;
using Windows.Devices.Enumeration;
using Windows.Storage.Streams;

namespace BluetoothDevicePairing.Bluetooth.Service;

public static class Nus {
    private static readonly Guid NordicUartServiceUuid          = Guid.Parse("6e400001-b5a3-f393-e0a9-e50e24dcca9e");
    private static readonly Guid NordicUartTxCharacteristicUuid = Guid.Parse("6e400002-b5a3-f393-e0a9-e50e24dcca9e");
    private static readonly Guid NordicUartRxCharacteristicUuid = Guid.Parse("6e400003-b5a3-f393-e0a9-e50e24dcca9e");
 
    public static async Task<bool> SendMessage(string deviceId, string message) {
       ...
    }
}

// in BluetoothDevicePairing\src\Bluetooth\Devices\DevicePairer.cs
using System;
using System.Threading.Tasks;
using BluetoothDevicePairing.Bluetooth.Service;

namespace BluetoothDevicePairing.Bluetooth.Devices;

internal static class DevicePairer
{
    public static void PairDevice(Device device, string pinCode)
    {
       ....
        bool result = await Nus.SendMessage(device.GetId(), "test");
    }
}

Answer 1

Hi, @brother uyl

The 'await' operator can only be used within an async method
As the compiler error indicates, you need to make the method async

public static async Task PairDevice(Device device, string pinCode)

Best regards,

Minxin Yu

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