How do you display a string array in a text box

问题:

Hi I am new to C# and I having problems with my first windows form application.

I have data coming in from serial port and have worked out a way of processing and storing the data into 3 different string arrays. What I cant work out is how to display the data in the arrays into their own individual text boxes, I would only want to display the data in the array pointed to by the current index position.

I have 3 text boxes in my windows forms design already they are named: textBoxmag, textBoxlat and textBoxlon I would like to display the variables string[] mag, string[] lat and string[] lon in their corresponding text boxes.

Please help me guys I properly stuck with this even though it may seem simple to you more experienced C# programmers. Below is my code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {

        string RxString;// where the raw serial data is stored
        string[] mag = new string[1000];//where magnetic data is stored 
        string[] lat = new string[1000];//where latidude data is stored
        string[] lon = new string[1000];///where longitude data is stored 
        string ends = "\r\n";//end of data sentence identifier
        string starts = "G";//start of data sentence identifier

        int i; //index lat data 
        int j;//index lon data
        int k;//index mag data


        public Form1()
        {
            InitializeComponent();
        }

        private void buttonStart_Click(object sender, EventArgs e)
        {
            serialPort1.PortName = "COM5";//define sierial port in which PIC is connected to
            serialPort1.BaudRate = 4800;//set baud rate to match PIC

            serialPort1.Open();
            if (serialPort1.IsOpen)//if the port is open you can press the start button
            {
                buttonStart.Enabled = false;//start button disbaled
                buttonStop.Enabled = true;//stop button enabled
                textBox1.ReadOnly = false;//allow writing in text box
            }
        }

        private void buttondtop_Click(object sender, EventArgs e)
        {
            if (serialPort1.IsOpen)
            {
                serialPort1.Close();
                buttonStart.Enabled = true;
                buttonStop.Enabled = false;
                textBox1.ReadOnly = true;
            }
        }



        private void DisplayText(object sender, EventArgs e)
        {
            textBox1.AppendText(RxString);//add watever is in raw data string to what is already in text box

        }


        private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)//activates when port is open and data in buffer
        {
            RxString = serialPort1.ReadExisting();//read raw data from serial port into string
            this.Invoke(new EventHandler(DisplayText));//invoke allows it to call function diplay text

            if (RxString.StartsWith(starts))//if the string starts with "G"
            {
                if ((RxString.Length > 36))//if there is aleast one string sentence
                {
                    if (RxString.EndsWith(ends))// if the string ends with "\r\n" process the string
                        serialPort1.Close();//close serial port 
                    lat[i] = RxString.Split(',')[0].Substring(4);// extract latitude store in string array
                    i++;//increment index of latitude data array
                    lon[j] = RxString.Split(',')[2];// extract longitude store in string array
                    j++;//increment index of longitude data array
                    mag[k] = RxString.Split(',')[3].Substring(7).Trim();// extract magnetic data store in string array
                    k++;//increment index of magnteric data array
                    RxString = null;//Reset raw data string
                    serialPort1.Open();//open serial port ready for new string sentence
                }
            }
            else RxString = null;// if the raw data string sentence does not start with "G" reset the array
           }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (serialPort1.IsOpen) serialPort1.Close();
        }

        private void labellat_Click(object sender, EventArgs e)
        {

        }

        private void label3_Click(object sender, EventArgs e)
        {

        }
    }
}

回答1:

You will need to convert your string[]s into strings. You can do this easily with the string.Join() method:

string separator = ", ";
string[] mag = new string[] { "hello", "world" };

textBoxmag.Text = string.Join(separator, mag);
// textBoxmag.Text == "hello, world";

回答2:

This will show the string arrays as commas separated values:

string strLat = String.Join(", ", lat);
string strLon = String.Join(", ", lon);

textBoxlat.Text = strLat;
textBoxlon.Text = strLon;

回答3:

I don't know if it's the best way, but here is a method on how it can be achieved.