如何在C＃中使用withevents [英] How to use withevents in C#

问题描述

大家好，

我找到代码来自

hi everyone,
I find code from

Sigurd Johansen

谈谈

NET中串口的通讯2.0



进口系统

进口System.IO.Ports



公开Class Form1

Dim WithEvents Port As SerialPort = _

新SerialPort（COM1，9600，Parity.None，8，StopBits.One）

Private Sub btnSendText_Click（ByVal sender As System.Object，_

ByVal e As System.EventArgs）处理btnSendText.Click

Port.Open（）

Port.Write（txtSendText.Text&！％）

Port.Close（）

结束子

结束上课



我想用C＃asp.net写它。有人可以帮助我。

谢谢。



我的尝试：

talk about
Communication on a serial port in NET 2.0

Imports System
Imports System.IO.Ports

Public Class Form1
Dim WithEvents Port As SerialPort = _
New SerialPort("COM1", 9600, Parity.None, 8, StopBits.One)
Private Sub btnSendText_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles btnSendText.Click
Port.Open()
Port.Write(txtSendText.Text & "!%")
Port.Close()
End Sub
End Class

I want write it in C# asp.net. Someone can help me.
thanks.

What I have tried:

Imports System
Imports System.IO.Ports

Public Class Form1
Dim WithEvents Port As SerialPort = _
New SerialPort("COM1", 9600, Parity.None, 8, StopBits.One)
Private Sub btnSendText_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles btnSendText.Click
Port.Open()
Port.Write(txtSendText.Text & "!%")
Port.Close()
End Sub
End Class

推荐答案

你好tanliem653，



没有必要相当于<$ c在这种情况下，$ c> WithEvents 。 C＃的等价物是：

Hi tanliem653,

There is no need for the equivalent of WithEvents in this case. The C# equivalent is:

using System.Windows.Forms;
using System.IO.Ports;

public partial class Form1 : Form
{
    SerialPort Port = new SerialPort("COM1", 9600, Parity.None, 8, StopBits.One);

    private void btnSendText_Click(object sender, EventArgs e)
    {
        Port.Open();
        Port.Write(txtSendText.Text + "!%");
        Port.Close();
    }
}

实际上在这种情况下，VB.NET代码也不需要 WithEvents 。只有在需要添加自定义事件处理程序时才需要它。例如：

Actually in this case, the VB.NET code doesn't need WithEvents either. It is only needed if there is a need to add a custom event handler. E.g.:

Private Sub MyPortAction(sender As Object, e As EventArgs) Handles Port.Disposed
......
......
End Sub

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