C# 异步C方法不返回字符串

我创建了一个返回字符串值的函数，但得到的错误是：

异步方法的返回类型必须为void、Task或Task

代码如下：

private async string SerialRead()
{
    const uint maxReadLength = 1024;
    DataReader dataReader = new DataReader(SerialPort.InputStream);
    uint bytesToRead = await dataReader.LoadAsync(maxReadLength);
    string rxBuffer = dataReader.ReadString(bytesToRead);
    return rxBuffer;
}

试试这个

private async Task<string> SerialRead()
{
    const uint maxReadLength = 1024;
    DataReader dataReader = new DataReader(SerialPort.InputStream);
    uint bytesToRead = await dataReader.LoadAsync(maxReadLength);
    string rxBuffer = dataReader.ReadString(bytesToRead);
    return rxBuffer;
}  

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错误消息清晰、直接且正确。可能重复