SerialPort.DataReceived 事件 (System.IO.Ports)

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public:
 event System::IO::Ports::SerialDataReceivedEventHandler ^ DataReceived;

public event System.IO.Ports.SerialDataReceivedEventHandler DataReceived;

member this.DataReceived : System.IO.Ports.SerialDataReceivedEventHandler

Public Custom Event DataReceived As SerialDataReceivedEventHandler

Public Event DataReceived As SerialDataReceivedEventHandler

本範例會將新增 SerialDataReceivedEventHandler 至 DataReceived ，以讀取 COM1 埠上接收的所有可用資料。請注意，若要測試此程式碼，必須將硬體連結至將傳送資料的 COM1。


   #using <System.dll>
using namespace System;
using namespace System::IO::Ports;
ref class PortDataReceived
public:
    static void Main()
        SerialPort^ mySerialPort = gcnew SerialPort("COM1");
        mySerialPort->BaudRate = 9600;
        mySerialPort->Parity = Parity::None;
        mySerialPort->StopBits = StopBits::One;
        mySerialPort->DataBits = 8;
        mySerialPort->Handshake = Handshake::None;
        mySerialPort->RtsEnable = true;
        mySerialPort->DataReceived += gcnew SerialDataReceivedEventHandler(DataReceivedHandler);
        mySerialPort->Open();
        Console::WriteLine("Press any key to continue...");
        Console::WriteLine();
        Console::ReadKey();
        mySerialPort->Close();
private:
    static void DataReceivedHandler(
                        Object^ sender,
                        SerialDataReceivedEventArgs^ e)
        SerialPort^ sp = (SerialPort^)sender;
        String^ indata = sp->ReadExisting();
        Console::WriteLine("Data Received:");
        Console::Write(indata);
int main()
    PortDataReceived::Main();
   
    using System;
using System.IO.Ports;
class PortDataReceived
    public static void Main()
        SerialPort mySerialPort = new SerialPort("COM1");
        mySerialPort.BaudRate = 9600;
        mySerialPort.Parity = Parity.None;
        mySerialPort.StopBits = StopBits.One;
        mySerialPort.DataBits = 8;
        mySerialPort.Handshake = Handshake.None;
        mySerialPort.RtsEnable = true;
        mySerialPort.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);
        mySerialPort.Open();
        Console.WriteLine("Press any key to continue...");
        Console.WriteLine();
        Console.ReadKey();
        mySerialPort.Close();
    private static void DataReceivedHandler(
                        object sender,
                        SerialDataReceivedEventArgs e)
        SerialPort sp = (SerialPort)sender;
        string indata = sp.ReadExisting();
        Console.WriteLine("Data Received:");
        Console.Write(indata);
    
     Imports System.IO.Ports
Class PortDataReceived
    Public Shared Sub Main()
        Dim mySerialPort As New SerialPort("COM1")
        mySerialPort.BaudRate = 9600
        mySerialPort.Parity = Parity.None
        mySerialPort.StopBits = StopBits.One
        mySerialPort.DataBits = 8
        mySerialPort.Handshake = Handshake.None
        mySerialPort.RtsEnable = True
        AddHandler mySerialPort.DataReceived, AddressOf DataReceivedHandler
        mySerialPort.Open()
        Console.WriteLine("Press any key to continue...")
        Console.WriteLine()
        Console.ReadKey()
        mySerialPort.Close()
    End Sub
    Private Shared Sub DataReceivedHandler(
                        sender As Object,
                        e As SerialDataReceivedEventArgs)
        Dim sp As SerialPort = CType(sender, SerialPort)
        Dim indata As String = sp.ReadExisting()
        Console.WriteLine("Data Received:")
        Console.Write(indata)
    End Sub
End Class
     
      資料事件可能是由 列舉中的任何
      
       SerialData
      
      專案所造成。 因為作業系統會判斷是否要引發此事件，所以可能不會報告所有同位錯誤。
     
     
      
       DataReceived
      
      如果收到 Eof 字元，不論內部輸入緩衝區中的位元組數目和 屬性的值
      
       ReceivedBytesThreshold
      
      為何，也會引發 事件。
     
     
      
       PinChanged
      
      、
      
       DataReceived
      
      和
      
       ErrorReceived
      
      事件可能會依序呼叫，而且基礎資料流程報告錯誤時和執行事件處理常式時，可能會稍有延遲。 一次只能執行一個事件處理常式。
     
     
      
       DataReceived
      
      事件不保證會針對收到的每個位元組引發。
      
       BytesToRead
      
      使用 屬性來判斷緩衝區中要讀取的資料量。
     
     
      
       DataReceived
      
      從
      
       SerialPort
      
      物件接收資料時，會在次要執行緒上引發事件。 因為這個事件是在次要執行緒上引發，而不是主執行緒，所以嘗試修改主執行緒中的某些元素，例如 UI 元素可能會引發執行緒例外狀況。 如果需要修改主要
      
       Form
      
      或
      
       Control
      
      中的專案，請使用 將變更要求張貼回
      
       Invoke
      
      ，這會在適當的執行緒上執行工作。
     
     
      如需處理事件的詳細資訊，請參閱
      
       處理和引發事件
      
      。