C#: Create a file and write an array of strings

Last update on December 20 2024 12:40:32 (UTC/GMT +8 hours)

Write a program in C# Sharp to create a file and write an array of strings to the file.

Sample Solution:-

C# Sharp Code:

using System; // Importing the System namespace for basic functionalities
using System.IO; // Importing the System.IO namespace for file operations

class WriteTextFile // Declaring a class named WriteTextFile
{
    static void Main() // Declaring the Main method
    {
        string fileName = @"mytest.txt"; // Initializing a string variable with the file name
        string[] ArrLines; // Declaring a string array variable to store lines of text
        int n, i; // Declaring variables for counting lines and iterating

        Console.Write("\n\n Create a file and write an array of strings  :\n"); // Displaying a message in the console
        Console.Write("---------------------------------------------------\n");

        if (File.Exists(fileName)) // Checking if the file already exists and deleting it if true
        {
            File.Delete(fileName); // Deleting the file if it exists
        }

        Console.Write(" Input number of lines to write in the file  :"); // Prompting the user to input the number of lines to write
        n = Convert.ToInt32(Console.ReadLine()); // Reading the number of lines provided by the user
        ArrLines = new string[n]; // Initializing the string array with the provided number of lines
        Console.Write(" Input {0} strings below :\n", n); // Prompting the user to input the lines of text

        // Loop to input lines of text based on the user-defined count
        for (i = 0; i < n; i++)
        {
            Console.Write(" Input line {0} : ", i + 1); // Prompting for each line
            ArrLines[i] = Console.ReadLine(); // Reading and storing each line of text in the array
        }

        // Writing all lines from the array to the file
        System.IO.File.WriteAllLines(fileName, ArrLines);

        // Reading and displaying the content of the file
        using (StreamReader sr = File.OpenText(fileName)) // Opening a StreamReader to read the content of the file
        {
            string s = "";
            Console.Write("\n The content of the file is  :\n"); // Displaying a message
            Console.Write("----------------------------------\n");

            // Reading and displaying each line of the file
            while ((s = sr.ReadLine()) != null) // Looping through each line until the end of the file
            {
                Console.WriteLine(" {0} ", s); // Displaying each line in the console
            }
            Console.WriteLine(); // Adding a newline for formatting
        }
    }
}

Sample Output:

 Create a file and write an array of strings  :                                                               
---------------------------------------------------                                                           
 Input number of lines to write in the file  :2                                                               
 Input 2 strings below :                                                                                      
 Input line 1 : This is a 1st line                                                                            
 Input line 2 : This is a 2nd line                                                                            
   
 The content of the file is  :                                                                                
----------------------------------                                                                            
 This is a 1st line                                                                                           
 This is a 2nd line

Flowchart :

C# Sharp Code Editor:

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