C＃串口寫字節

Question

在C＃在.NET 4.0中寫入串行端口的單字節導致

InvalidOperationException異常是未處理的用戶代碼

每次一個字節被髮送到串行端口。

如何向串口寫入單個字節？

//Serial Init 
    //Full fledged constuctor 
    public NetCommManager(String portName, TransmissionType trans, String baud, String parity, String stopBits, String dataBits) 
    { 
     nc_baudRate = baud; 
     nc_parity = parity; 
     nc_stopBits = stopBits; 
     nc_dataBits = dataBits; 
     nc_portName = portName; 
     nc_transType = trans; 

     //now add an event handler 
     comPort.DataReceived += new SerialDataReceivedEventHandler(netComm_DataReceived); 
    } 

配置：

 _commManger = new NetCommManager(commPortNumber,       
     NetCommManager.TransmissionType.Text, "19200", "None", "One", "8"); 

的字節寫入：

_commManager.WriteByte(Convert.ToByte(0x7B)); 

而且WriteByte功能是：

public void WriteByte(byte data) 
     { 
      //change data to array 
      //byte[] dataArray = new byte[1]; 
      var dataArray = new byte[] {data}; 
      //dataArray[0] = data; 
      comPort.Write(dataArray, 0, 1); // <-- Exception is thrown here 
     } 

的NetCommManager類是非常基礎this example

Answer 1

你忘了Open()的comPort：你缺少一個相稱創建對象的代碼的部分http://msdn.microsoft.com/en-us/library/ms143551.aspx