在C#中读取文本文件
在C#中读取文本文件
提问于 2011-11-02 20:39:37
我使用以下程序将信息发送(输出)到文本文件，但现在我想从文本文件中读取(输入)信息。任何建议都将不胜感激。我已经注释掉了“我认为”我需要做的几件事；但我真的不确定如何继续。
using System.Windows.Forms;
using System.IO;
namespace Input_Output
{
public partial class Grades : Form
{
private StreamWriter output;
private StreamReader input;
public Grades()
{
InitializeComponent();
}
private void label4_Click(object sender, EventArgs e)
{
}
private void btnCreate_Click(object sender, EventArgs e)
{
btnEnter.Visible = true;
btnClose.Visible = true;
txtFirst.Visible = true;
txtLast.Visible = true;
lblFirst.Visible = true;
lblLast.Visible = true;
listBox1.Visible = true;
lblStatus.Visible = true;
lblGrade.Visible = true;
lblCourse.Visible = true;
cmbID.Visible = true;
lblID.Visible = true;
txtCourse.Visible = true;
txtGrade.Visible = true;
lblStatus.Visible = true;
DialogResult result;
string fileName;
using (SaveFileDialog chooser = new SaveFileDialog())
{
result = chooser.ShowDialog();
fileName = chooser.FileName;
}
output = new StreamWriter(fileName);
btnCreate.Enabled = false;
txtFirst.Visible = true;
txtLast.Visible = true;
lblFirst.Visible = true;
lblLast.Visible = true;
btnEnter.Visible = true;
btnClose.Visible = true;
}
private void btnClose_Click(object sender, EventArgs e)
{
//Close button pushes information from the listbox in to the text file
output.Close();
lblStatus.ForeColor = Color.Red;
lblStatus.Text = "Output File";
btnCreate.Enabled = true;
listBox1.Items.Clear();
cmbID.Text = "";
}
private void btnEnter_Click(object sender, EventArgs e)
{
// Enter button sends information to the list box, a Message Box prompts user to check for accuracy.
//Close button pushes information to the Text file.
string last = "";
string first = "";
string course = "";
string grade = "";
if (txtFirst.Text != "" && txtLast.Text != "" && txtCourse.Text != "")
{
last = txtFirst.Text;
first = txtLast.Text;
course = txtCourse.Text;
grade = txtGrade.Text;
output.WriteLine (last + "\t"+ "\t" + first + ":"+ "\t" + cmbID.SelectedItem + "_" + course + "_" + grade );
listBox1.Items.Add(txtLast.Text + "," + txtFirst.Text + ":" + cmbID.SelectedItem + "-" + txtCourse.Text + "-" + txtGrade.Text);
lblStatus.ForeColor = Color.Navy;
lblStatus.Text = "Entry Saved";
txtFirst.Text = "";
txtLast.Text = "";
txtCourse.Text = "";
txtGrade.Text = "";
txtFirst.Focus();
}
else
{
lblStatus.ForeColor = Color.Red;
lblStatus.Text = "Empty text box or boxes";
}
MessageBox.Show("Please verify that the information is correct before proceeding");
}
private void btnExit_Click(object sender, EventArgs e)
{
Application.Exit();
}
private void Grades_Load(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
DialogResult result;
string fileName;
using (OpenFileDialog chooser = new OpenFileDialog())
{
result = chooser.ShowDialog();
fileName = chooser.FileName;
}
//while loop?
//if variable is null, it's the end of the record
//variable= !null
//txt read int variable TxtFile.Text += Rec + "\r\n"; while rec !=null;
}
}
}回答 8
Stack Overflow用户
发布于 2011-11-02 20:51:47
要一次读取一行文本文件，您可以这样做：
using System.IO;
using (var reader = new StreamReader(fileName))
{
string line;
while ((line = reader.ReadLine()) != null)
{
// Do stuff with your line here, it will be called for each
// line of text in your file.
}
}还有其他方法。例如，如果文件不是太大，而您只想将所有内容读取到单个字符串，则可以使用File.ReadAllText()
myTextBox.Text = File.ReadAllText(fileName);Stack Overflow用户
发布于 2014-07-18 09:24:54
这只是一行代码：
string content = System.IO.File.ReadAllText(@"C:\textfile.txt");Stack Overflow用户
发布于 2011-11-02 20:46:54
试试这个：
if(result == DialogResult.OK && fileName != null)
{
try
{
var fileText=File.ReadAllText(fileName);
}
catch(Exception ex)
{
//Handle exception here
}
}它会将选定文件中的所有数据读取到fileText变量中。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/7980456
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