将列表项写入文本文件C＃

Question

I am trying to get a List to save into a text file and am running into a problem. It will save into the text file but not all the information as needed but only the information that actually shows in the ListBox . Suggestions?

namespace Employee_Form
{
public partial class frmMain : Form
{
    FileStream output;
    StreamReader fileReader;
    //StreamWriter fileWriter;
    List<Employee> employeeList = new List<Employee>();


    public frmMain()
    {
        InitializeComponent();
    }

    private void frmMain_Load(object sender, EventArgs e)
    {

    }

    private void openToolStripMenuItem_Click(object sender, EventArgs e)
    {
        OpenFile();
    }

    private void saveAsToolStripMenuItem_Click(object sender, EventArgs e)
    {
        SaveAs();
    }

    private void addNewToolStripMenuItem_Click(object sender, EventArgs e)
    {
        PropertiesOpen();
    }

    private void PropertiesOpen()
    {

        //creates an instance of the Properties Form
        frmProperties myform = new frmProperties();
        DialogResult result = myform.ShowDialog();
    }


    //Opens a file chosen by a user and places information into the listbox
    private void OpenFile()
    {

        OpenFileDialog fileChooser = new OpenFileDialog();

        fileChooser.Title = "Pick a file";
        fileChooser.Filter = "Text Files (*.txt) | *.txt";

        DialogResult result = fileChooser.ShowDialog();

        //
        if (result == DialogResult.Cancel)
        {
            //do nothing
            return;
        }

        string strFileName = fileChooser.FileName;

        try
        {
            //open the file for read access
            output = new FileStream(strFileName, FileMode.Open, FileAccess.Read);

            fileReader = new StreamReader(output);

            //variables to hold read record
            string strInputLine;
            string[] fields;

            //loop to get records and break into fields
            while (fileReader.EndOfStream != true)
            {
                //read record
                strInputLine = fileReader.ReadLine();

                //split the records when read
                fields = strInputLine.Split(',');

                //add records to the list box 
                employeeList.Add(new Employee(fields[1], fields[0], fields[2], 
                                     Convert.ToDouble(fields[3])));

            }
            lstRecords.DataSource = employeeList;
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
        finally
        {
            //closes fileReader and output to save Resources
            fileReader.Close();
            output.Close();
        }
    }

    public void SaveAs()
    {
        //create a file dialog
        SaveFileDialog fileChooser = new SaveFileDialog();
        fileChooser.Title = "Choose A Save Location";
        fileChooser.Filter = "Text Files (*txt)|*.txt";

        //open the dialog and get a result
        DialogResult result = fileChooser.ShowDialog();

        //checks if user clicks cancel
        if (result == DialogResult.Cancel)
        {
            return;
        }

        //get the file name from the dialog
        string strFileName = fileChooser.FileName;
        try
        {
            //open the new file for write access
            StreamWriter SaveFile = new StreamWriter(strFileName);

            foreach (var item in employeeList)
            {
                SaveFile.WriteLine(item.ToString());
            }
            SaveFile.Close();
        }

        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }

        finally
        {
            //close resources
            //fileWriter.Close();
            output.Close();
        }
    }
}

Sorry, I am new to this. There are two forms and the second one is for editing/adding new employees. only need to show the first and last name in the ListBox. Here is my Employee class also:

public class Employee
{
    public string FirstName
    {
        get;
        set;
    }

    public string LastName
    {
        get;
        set;
    }

    public string EmpType
    {
        get;
        set;
    }

    public double Salary
    {
        get;
        set;
    }

    public Employee(string firstName, string lastName, string empType, double salary)
    {
        FirstName = firstName;
        LastName = lastName;
        EmpType = empType;
        Salary = salary;
    }

    public override string ToString()
    {
        return string.Format("{0}, {1}", LastName, FirstName);
    }
}

Answer 1

When you call SaveFile.WriteLine(item.ToString()); , you're writing the result of the ToString() method of Employee :

return string.Format("{0}, {1}", LastName, FirstName);

This is the same method called by the ListBox to display the object in the list. So the behavior you're seeing is exactly what one would expect.

If you want to see something different, try something like this:

SaveFile.WriteLine(string.Format("{0}, {1}, {2}, {3}", item.LastName, item.FirstName, item.EmpType, item.Salary));

Use whatever properties and formatting you want in your file.