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C# File Handling with Dialogs

Posted by Deepak Dwij Articles | C# Language November 14, 2011
File data needs to be processed in nearly every non-trivial program, and the classes in the base class library that you can use have lots of details, we evaluate file handling.Dialog boxes are used to gather input from users. You can create your own dialog boxes or use the built-in dialog boxes
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Introduction

File data needs to be processed in nearly every non-trivial program, and the classes in the base class library that you can use have lots of details. With these benchmarks and examples focused on file IO in the C# language, we evaluate file handling.

Dialog boxes are used to gather input from users. You can create your own dialog boxes or use the built-in dialog boxes.

Dialogs

  • OpenFileDialog
  • SaveFileDialog
  • FolderBrowserDialog
  • FontDialog
  • ColorDialog

Design

In the design form section ,drag 'n drop dialogs, a richtextbox and five button control as show below:

1.gif

Program

using System;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;
using System.IO;
namespace filehanding
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
              StreamReader sr = new StreamReader(openFileDialog1.FileName);
              richTextBox1.Text=sr.ReadToEnd();
              sr.Close();
            }
       }       
        private void button3_Click(object sender, EventArgs e)
        {
            FontDialog font = new FontDialog();
            if (font.ShowDialog() != DialogResult.Cancel)
            {
               richTextBox1.Font = font.Font;           
            }
        }
        private void button4_Click(object sender, EventArgs e)
        {
            if (colorDialog1.ShowDialog() != DialogResult.Cancel)
            {
                richTextBox1.ForeColor = colorDialog1.Color;
            }
        }
        private void button2_Click_1(object sender, EventArgs e)
        {
            //saveFileDialog1.Filter = "txt files (*.txt)|*.txt";
            saveFileDialog1.Filter = "txt files (*.doc)|*.doc";
           if (saveFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK && saveFileDialog1.FileName.Length > 0)
            {
                 richTextBox1.SaveFile(saveFileDialog1.FileName,RichTextBoxStreamType.PlainText);
            }
        }
        private void button5_Click(object sender, EventArgs e)
        {
            if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
            {
                richTextBox1.Text = folderBrowserDialog1.SelectedPath;
            }
 
        }
    }
}

Output: To Run hit F5.

Open file Button


2.gif

Result

3.gif

Save file Button

4.gif 

Browse folder Button

browse-1.gif

Result


r-browse.gif

Font Change Button

5.gif

Result


6.gif

Change Color Button

Untitled-7.gif

Result


8.gif

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