在保存对话框中预选（C＃）

Question

Goal:
Save a notepad file in the computer. (C#)

Problem:
I don't know how to make a preselection as "TXT Files(*.txt)" in the "Save as type:" when save dialog display?

// Fullmetalboy

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace Labb2_application
{
    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
        }

        private void mnuFileOpen_Click(object sender, EventArgs e)
        {

            OpenFileDialog fDialog = new OpenFileDialog();
            fDialog.Title = "Öppna";
            fDialog.Filter = "Text files|*.txt";
            fDialog.InitialDirectory = @"C:\Windows";
            fDialog.ShowHelp = true;

            DialogResult result = fDialog.ShowDialog(); // Show the dialog and get result.

            if (result == DialogResult.OK)
            {
                string fileAdress = fDialog.FileName;

                try
                {
                    string textContent = File.ReadAllText(fileAdress);

                    rtxtDisplay.Text = textContent;
                }
                catch (IOException)
                {


                }



            } // If syntax

        }


        private void mnuFileSave_Click(object sender, EventArgs e)
        {
            saveAsFileDialog.ShowDialog();
        }






        private void mnuFileSaveAs_Click(object sender, EventArgs e)
        {

            saveAsFileDialog.Filter = "Text files|*.txt";
            saveAsFileDialog.ShowDialog();

        }


        private void mnuFileExit_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }


        private void saveAsFileDialog_FileOk(object sender, CancelEventArgs e)
        {
            string fileNameAddress = saveAsFileDialog.FileName;

            File.WriteAllText(fileNameAddress, rtxtDisplay.Text);
        }










    } // Partial Class
}

Answer 1

You can select the currently active filter by specifying a FilterIndex .

In addition, you can specify the default file extension to use when saving by changing the DefaultExt property.

Answer 2

Off the top of my head, the file saveas dialog box protocol can be bit more non-intuitive as expected.

I think you need to parenthesis into the filter.

Best, J

Answer 3

This will create a new filter for your SaveFileDialog:

        SaveFileDialog sfd = new SaveFileDialog();
        sfd.Filter = "Text files(*.txt)|*.txt"

The first part is the text shown to the user and the second one is the extension. If you want to add more, just do so by separating them by '|' character. The default behaviour is to select the first filter but if you want to change that, use "FilterIndex" property.