CODEWITHSUNDEEP
c#winforms
RobotRock
RobotRock

Reputation: 4459

SaveFileDialog removes extension from set filename

I have the app below. I modified it slightly for easier testing for readers here. I notice that when I set the Filename with an extension, e.g. test.txt, the txt extension is removed by the dialog. However I want users to be able to specify an extension, and more importantly I want to be able to set the extension. One way to hack it in I figure is to modify the filter based on the extension I have. Is this the only way?

I am using VS 2010 Express.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Globalization;
using System.IO;
using System.Windows;
namespace SpeedDating
{
    partial class Program
    {
         [STAThread]
        static void Main(string[] args)
        {
            Form form = new Form();
            form.WindowState = FormWindowState.Minimized;
            form.ShowInTaskbar = false;
            form.TopMost = true;
            form.Show();

            string filename = "test.txt";
            string ext = filename.Substring(filename.LastIndexOf('.'));
            SaveFileDialog dialog = new SaveFileDialog();
            dialog.Title = "SpeedDating App";
            dialog.RestoreDirectory = true;
            dialog.CheckFileExists = false;
            dialog.CheckPathExists = false;
            dialog.SupportMultiDottedExtensions = true;
            dialog.AddExtension = false;
            dialog.Filter = "All files (*.*)|*.*";
            dialog.FileName = DateTime.Now.ToString("yyyyMMdd") + ext;

            DialogResult result = dialog.ShowDialog();
            if (result == DialogResult.OK && dialog.FileName != "")
            {
                try
                {
                    FileStream outfs = File.Create(dialog.FileName);
                    FileStream infs = File.Open(filename, FileMode.Open);
                    infs.CopyTo(outfs);
                    infs.Close();
                    outfs.Close();

                    MessageBox.Show(form, "Copied file.");
                }
                catch (NotSupportedException ex)
                {
                    MessageBox.Show(form, "Probably removed the original file.");
                }
            }
            else if (result != DialogResult.Cancel)
            {
                MessageBox.Show(form, "No path found to write to.");
            }

            form.Close();
        }
    }
}

Upvotes: 2

Views: 3865

Answers (1)

Idle_Mind
Idle_Mind

Reputation: 39122

and more importantly I want to be able to set the extension

You can set the .DefaultExt(), .AddExtension(), .Filter(), and .FilterIndex() properties:

        string filename = "test.xyz";

        SaveFileDialog dialog = new SaveFileDialog();
        dialog.Title = "SpeedDating App";
        dialog.RestoreDirectory = true;
        dialog.CheckFileExists = false;
        dialog.CheckPathExists = false;
        dialog.SupportMultiDottedExtensions = true;
        dialog.Filter = "All files (*.*)|*.*";

        dialog.DefaultExt = System.IO.Path.GetExtension(filename);
        if (dialog.DefaultExt.Length > 0)
        {
            dialog.AddExtension = true;
            dialog.Filter = dialog.DefaultExt + " files (*." + dialog.DefaultExt + ")|*." + dialog.DefaultExt + "|" + dialog.Filter;
            dialog.FilterIndex = 0;
        }

        dialog.FileName = DateTime.Now.ToString("yyyyMMdd");

        DialogResult result = dialog.ShowDialog();
        if (result == DialogResult.OK && dialog.FileName != "")
        {
            Console.WriteLine(dialog.FileName);
        }

*Note that if the option to display "File Extensions" is turned OFF in File Explorer, then the dialog will also hide the extension...BUT the above setup will add the set extension to the .FileName() value returned by the dialog.

Upvotes: 4

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