I want to save full path of listbox in C#

Question

First Of All I add Directory in Listbox, Like A Directory, B Directory. When User Click the item of ListBox ,Get the full path of Items in C#
Someone modify the code !
Thanks in Advance !

BindingSource listboxsource = null;
public Form1()
{
InitializeComponent();
listboxsource = new BindingSource(Properties.Settings.Default.listboxitems, "");
someListbox.DataSource = listboxsource;

}

//Add Folder in Listbox
private void button57_Click(object sender, EventArgs e)
{

FolderBrowserDialog dialog = new FolderBrowserDialog();

dialog.Description = "Please Select Folder";

if (dialog.ShowDialog() == DialogResult.OK)
{

string folderName = dialog.SelectedPath;

string s = Path.GetFileName(folderName);
listboxsource.Add(s);

Properties.Settings.Default.Save();
listboxsource = new BindingSource(Properties.Settings.Default.listboxitems, "");
someListbox.DataSource = listboxsource;
}
}

private void listBox5_SelectedIndexChanged(object sender, EventArgs e)
{
try
{
string fullname = Properties.Settings.Default.FullName;

Properties.Settings.Default.Save();
MessageBox.Show(fullname);
}
catch(Exception)
{ }
}

Answer 1

I would highly suggest storing information in a json file rather than under settings.

Full source

Using NewtonSoft NuGet package

public static class JsonHelpers  
{  
    public static string FileName = "Items.json";  
  
    /// <summary>  
    /// Create a mockup if file does not exists  
    /// </summary>  
    public static void InitializeData()  
    {  
        if (!File.Exists(FileName))  
        {  
            File.WriteAllText(JsonHelpers.FileName, JsonConvert.SerializeObject(MockOperations.List, Formatting.Indented));  
        }  
    }  
  
    /// <summary>  
    /// Read items  
    /// </summary>  
    /// <returns></returns>  
    public static List<FileItem> Read() =>   
        JsonConvert.DeserializeObject<List<FileItem>>(File.ReadAllText(JsonHelpers.FileName));  
  
    /// <summary>  
    /// Save items  
    /// </summary>  
    /// <param name="list"></param>  
    public static void Save(List<FileItem> list) =>   
        File.WriteAllText(FileName, JsonConvert.SerializeObject(list, Formatting.Indented));  
}  
  

Container class

public class FileItem : INotifyPropertyChanged  
{  
    private string _fullName;  
  
    public string FullName  
    {  
        get => _fullName;  
        set  
        {  
            _fullName = value;  
            OnPropertyChanged();  
        }  
    }  
  
    [JsonIgnore]  
    public string FileName => Path.GetFileName(FullName);  
    public override string ToString() => FileName;  
    public event PropertyChangedEventHandler PropertyChanged;  
    protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)  
    {  
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));  
    }  
}  

Form code

public partial class Form1 : Form  
{  
    public BindingSource _BindingSource = new BindingSource();  
    public Form1()  
    {  
        InitializeComponent();  
          
        JsonHelpers.InitializeData();  
          
        _BindingSource.DataSource = JsonHelpers.Read();  
          
        listBox1.DataSource = _BindingSource;  
          
        listBox1.MouseDoubleClick += ListBox1OnMouseDoubleClick;  
          
        Closing += OnClosing;  
    }  
  
    private void OnClosing(object sender, CancelEventArgs e)  
    {  
        JsonHelpers.Save((List<FileItem>)_BindingSource.DataSource);  
    }  
  
    private void ListBox1OnMouseDoubleClick(object sender, MouseEventArgs e)  
    {  
        if (_BindingSource.Current == null) return;  
          
        if (!label1.Visible)  
        {  
            label1.Visible = true;  
        }  
  
        label1.Text = ((FileItem) _BindingSource.Current).FullName;  
  
    }  
  
    private void AddNewButton_Click(object sender, EventArgs e)  
    {  
        _BindingSource.Add(new FileItem() {FullName = "D:\\Docs\\readme.md"});  
    }  
}  

Answer 2

It is rare to store information in this location, but maybe you have your reasons, so I will modify it based on the current code.

You did not show the code in Properties.Settings. Based on the current information, I guess it looks like this:

    internal sealed partial class Settings : global::System.Configuration.ApplicationSettingsBase  
    {  
  
        private static Settings defaultInstance = ((Settings)(global::System.Configuration.ApplicationSettingsBase.Synchronized(new Settings())));  
        public List<string> listboxitems = new List<string>();  
        public string FullName { get; set; }  
        public static Settings Default  
        {  
            get  
            {  
                return defaultInstance;  
            }  
        }  
    }  

The listboxitems has nothing to do with FullName. You add elements to listboxitems in the code, but FullName is always empty.

Since those items are directories, then we can use DirectoryInfo to store its information.

        public List<DirectoryInfo> listboxitems = new List<DirectoryInfo>();  

Code in Form:

        private void button1_Click(object sender, EventArgs e)  
        {  
            FolderBrowserDialog dialog = new FolderBrowserDialog();  
  
            dialog.Description = "Please Select Folder";  
  
            if (dialog.ShowDialog() == DialogResult.OK)  
            {  
           
                string folderName = dialog.SelectedPath;  
                DirectoryInfo directoryInfo = new DirectoryInfo(folderName);  
  
                Properties.Settings.Default.listboxitems.Add(directoryInfo);  
  
                Properties.Settings.Default.Save();  
                listboxsource = new BindingSource(Properties.Settings.Default.listboxitems.Select(d=>d.Name), "");  
                listBox1.DataSource = listboxsource;  
            }  
        }  
  
        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)  
        {  
            try  
            {  
                ListBox listBox = sender as ListBox;  
                string fullname = Properties.Settings.Default.listboxitems[listBox.SelectedIndex].FullName;  
  
                Properties.Settings.Default.Save();  
                MessageBox.Show(fullname);  
            }  
            catch (Exception ex)  
            {  
                //do something  
            }  
        }  

In the SelectedIndexChanged method, please don't use try-catch but do nothing in the catch. If there is an exception in the code in the try, the application will have no prompt, so please add some code in the catch to handle the exception.

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