C＃将数据写入文本文件 [英] C# Write Data to a text File

问题描述

我在这里得到了家庭作业。我创建了一个带有4个文本框的表单，用于输入数据，账号，名字，姓氏，余额。我有四个按钮，创建文件，将数据保存到文件，清除和退出。基本上所有的程序都是创建一个文本文件，然后我输入我的数据到文本框中，然后我点击保存数据文件，将数据写入我创建的文本文件。 清除和退出已经完成了，而且我的程序在创建文本文件的过程中起作用，现在我只需要有人指示我如何正确写入我输入到文本文件中的数据。这里是我的代码，提前致谢

  using System; 
使用System.Collections.Generic; 
使用System.ComponentModel; 
使用System.Data; 
使用System.Drawing; 
使用System.Linq; 
使用System.Text; 
使用System.Threading.Tasks; 
使用System.Windows.Forms; 
使用System.IO; 
 
 namespace Chapter_17_Ex.Sample_1 
 {
 public partial class Form1：Form 
 {
 public Form1（）
 {
 InitializeComponent （）; 
 
 
 private void btnCreate_Click（object sender，EventArgs e）
 {
 SaveFileDialog file = new SaveFileDialog（）; 
 file.FileName =client.txt; 
 file.Filter =txt文件（* .txt）| * .txt |所有文件（*。*）| *。*; 
 file.ShowDialog（）; 
 
 StreamWriter filewrite = new StreamWriter（file.FileName）; 
 
 
 
 
 
 private void btnSave_Click（object sender，EventArgs e）
 {
 TextWriter file = new TextWriter 
 
} 
 
 private void btnClear_Click（object sender，EventArgs e）
 {
 txtAccount.Clear（）; 
 txtBalance.Clear（）; 
 txtFirstName.Clear（）; 
 txtLastName.Clear（）; 
 
 
 private void btnExit_Click（object sender，EventArgs e）
 {
 Application.Exit（）; 
 
 
 
  

解决方案

您正在创建StreamWriter实例的正确轨道上。你现在要做的是使用该类的 WriteLine（）方法。使用块封装StreamWriter实例在中也是一个好主意：

  private void btnCreate_Click（object sender，EventArgs e）
 {
 SaveFileDialog file = new SaveFileDialog（）; 
 file.FileName =client.txt; 
 file.Filter =txt文件（* .txt）| * .txt |所有文件（*。*）| *。*; 
 file.ShowDialog（）;使用（StreamWriter filewrite = new StreamWriter（file.FileName））
 
 filewrite.WriteLine（String.Format（First Name is {0}，txtFirstName.Text ））; 
 //根据需要再次使用Write（）或WriteLine（）。 
} 
} 
  




I got a homework assignment here. I've created a form with 4 text boxes for data entry, Account #, First Name, Last Name, Balance. I have four buttons, Create File, Save data to file, clear, and exit. Basically all the program does is create a text file, then I input my data into the text boxes, then I hit save data file which will write the data to the text file I have created. Clear and Exit are already done, and I have the program working as far as creating the text file, now I just need someone to point me in the right direction on how to actually write the data I entered into the text file. Here is my code, Thanks in advance

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

namespace Chapter_17_Ex.Sample_1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnCreate_Click(object sender, EventArgs e)
        {
            SaveFileDialog file = new SaveFileDialog();
            file.FileName = "client.txt";
            file.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
            file.ShowDialog();           

            StreamWriter filewrite = new StreamWriter(file.FileName);          



        }

        private void btnSave_Click(object sender, EventArgs e)
        {
            TextWriter file = new TextWriter

        }

        private void btnClear_Click(object sender, EventArgs e)
        {
            txtAccount.Clear();
            txtBalance.Clear();
            txtFirstName.Clear();
            txtLastName.Clear();
        }

        private void btnExit_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }
    }
}

解决方案

You're on the right track with creating that StreamWriter instance. What you want to do now is use the WriteLine() method of that class. It's also a good idea to wrap that StreamWriter instance in a using block:

    private void btnCreate_Click(object sender, EventArgs e)
            {
                SaveFileDialog file = new SaveFileDialog();
                file.FileName = "client.txt";
                file.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
                file.ShowDialog();           

                using(StreamWriter filewrite = new StreamWriter(file.FileName))
                {
                     filewrite.WriteLine( String.Format("First Name is {0}", txtFirstName.Text)  );
                     //use Write() or WriteLine() again as needed.
                }
            }

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