MqttRpcDeviceReadAsyncT 方法

public virtual Task<OperateResult<T>> ReadAsync<T>()
where T : class, new()

Public Overridable Function ReadAsync(Of T As {Class, New}) As Task(Of OperateResult(Of T))

public:
generic<typename T>
where T : ref class, gcnew()
virtual Task<OperateResult<T>^>^ ReadAsync()

abstract ReadAsync : unit -> Task<OperateResult<'T>>  when 'T : not struct, new()
override ReadAsync : unit -> Task<OperateResult<'T>>  when 'T : not struct, new()

// 假设你要读取几个数据的情况，我们把需要读取的数据定义成一个个的数量，本示例既适合单个读取，也适合批量读取，以下就是混搭的情况。
// 我们假设，我们要读取的PLC是西门子PLC，地址数据的假设如下
// 我们假设 设备是否启动是 M0.0
// 产量是 M10 开始的2个地址数据
// 温度信息是 DB1.0开始的4个地址数据
// 报警的IO信息是 M200 开始，5个字节，共计40个IO点信息
// 那么我们可以做如下的定义

public class DataExample
{
    /// <summary>
    /// 设备是否启动
    /// </summary>
    [HslDeviceAddress( "M0.0" )]
    public bool Enable { get; set; }

    /// <summary>
    /// 产量信息
    /// </summary>
    [HslDeviceAddress( "M10" )]
    public short Production { get; set; }

    /// <summary>
    /// 温度信息
    /// </summary>
    [HslDeviceAddress( "DB1.0" )]
    public float Temperature { get; set; }

    /// <summary>
    /// 连续的位报警信息
    /// </summary>
    [HslDeviceAddress( "M200", 5 )]
    public byte[] AlarmStatus { get; set; }
}

SiemensS7Net plc = new SiemensS7Net( SiemensPLCS.S1200, "192.168.0.100" );

// 此处需要注意的是，凡是带有 HslDeviceAddress 特性的属性都会被读取出来
OperateResult<DataExample> read = await plc.ReadAsync<DataExample>( );
if (read.IsSuccess)
{
    // success
    DataExample data = read.Content;
}
else
{
    // failed
    Console.WriteLine( "读取失败：" + read.Message );
}