stringbuilder中的refrence类型

问题描述

在类中我想从串口读取数据。

有一个字符串值（PortData），当我点击按钮时，我想存储从端口接收的所有数据收到所有数据后，我希望PortData值显示在文本框中。

In a class I want to read data from serial port.
There is a string value(PortData) in which I want to store all data received from port when I click on a button and at the end when all data is received,I want the PortData value to be shown in a textbox.

public class pro
{
   StringBuilder PortData = new StringBuilder();


 private void btnOpenPort_Click(object sender, EventArgs e)
 {
                mySerialPort.DataReceived += new                 SerialDataReceivedEventHandler(DataReceivedHandler);
                try
                {
                    mySerialPort.Open();
                    txbShowFile.Text = PortData.ToString();
                }
 }
 private static void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e)
        {
            SerialPort sp = (SerialPort)sender;
            PortData.Append(sp.ReadExisting());
        }
}

问题是收到数据后portdata显示变量的第一个值。它意味着空值。

the problem is after receiving data portdata shows the first value of variable. it means null value.

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