Stringbuilder append save file, list<string>

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I want to use to an app where you click on a button (Car) it then takes you to a new window where all the models are listed 1. Honda 2.Toyota 3. Fiat 4.Ferrari. Then you should input on the Textbox the number of the car model you want to save. So if you choose 1. when it saves threw Stringbuilder, the text should come out simply Honda.

{
       StringBuilder _car  = new StringBuilder();

   public MainWindow()
   {
       InitializeComponent();

       Car();
   }
    private void Car()
   {
       _car.Append("Honda");
       _car.Append("Toyota");
       _car.Append("Fiat");
       _car.Append("Ferrari");
       }
    private void button1_Click(object sender, RoutedEventArgs e)
     {
       using (SaveFileDialog dlg = new SaveFileDialog())
       {
           if (dlg.ShowDialog() == System.Windows.Forms.DialogResult.OK)
           {
               string fileName = dlg.FileName;
               SaveToFile(fileName);
             }
         }

      }
private void SaveToFile(string fileName)
      {

       System.IO.TextWriter w = new System.IO.StreamWriter(fileName);
       w.Write(_car.ToString());
       w.Flush();
       w.Close();
        }
    }
 }

What I have tried:

This is as far as I got, problem is I dont know how to use the List and how just save the word, now if i input a number it saves all the models.

Posted 23-Nov-17 14:34pm

Member 13538296

Updated 23-Nov-17 15:45pm

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Graeme_Grant · Answer 1 · 2017-11-23T15:45:00

System.Windows.Forms = WinForm, not WPF. Are you sure that this is WPF?

If it is WPF app, then have a read of this to answer your question: WPF Tutorial - The SaveFileDialog[^]

If it is a WinForm app, then have a read of this to answer your question: How to: Save Files Using the SaveFileDialog Component | Microsoft Docs[^]

With regards to the List and StringBuilder[^], Your ouput string has no seperators in the name, so parsing the data back in will be troublesome. It will look like:

HondaToyotaFiatFerrari

You need to have a delimiter to separate them out:

C#

var cars = new string[] { "Honda", "Toyota", "Fiat", "Ferrari" };

var outString1 = String.Join(", ", cars);

// or

var outString2 = String.Join(Environment.NewLine, cars);