异步 C# 方法不返回字符串

Question

我创建了一个返回字符串值的函数，但我收到错误消息：

async 方法的返回类型必须为 void、Task 或 Task

这是代码：

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;
}

Answer 1

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;
}