C#: Read a specific line from a file
Write a program in C# Sharp to read a specific line from a 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 filexercise13 // Declaring a class named filexercise13
{
static void Main() // Declaring the Main method
{
string fileName = @"mytest.txt"; // Initializing a string variable with the file name
string[] ArrLines; // Declaring an array to store lines of text
int n, i, l; // Declaring variables for iteration, line count, and specific line to read
// Displaying a message to read a specific line from a file
Console.Write("\n\n Read a specific line from a file :\n");
Console.Write("----------------------------------------\n");
if (File.Exists(fileName)) // Checking if the file 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 :");
n = Convert.ToInt32(Console.ReadLine()); // Reading user input for the number of lines
ArrLines = new string[n]; // Initializing the array to store lines
Console.Write(" Input {0} strings below :\n", n); // Prompting user to input lines
for (i = 0; i < n; i++)
{
Console.Write(" Input line {0} : ", i + 1);
ArrLines[i] = Console.ReadLine(); // Reading lines of text from user input
}
// Writing all lines to the file
System.IO.File.WriteAllLines(fileName, ArrLines);
Console.Write("\n Input which line you want to display :");
l = Convert.ToInt32(Console.ReadLine()); // Reading user input for the line number to display
if (l >= 1 && l <= n) // Checking if the specified line number is within the valid range
{
Console.Write("\n The content of the line {0} of the file {1} is : \n", l, fileName);
if (File.Exists(fileName)) // Checking if the file exists
{
string[] lines = File.ReadAllLines(fileName); // Reading all lines from the file
Console.WriteLine(" {0}", lines[l - 1]); // Writing the specific line to the console
}
}
else
{
Console.WriteLine(" Please input the correct line number."); // Displaying message for incorrect line number
}
Console.WriteLine();
}
}
Sample Output:
Read a specific line from a file : ---------------------------------------- Input number of lines to write in the file :2 Input 2 strings below : Input line 1 : welcome w3resource Input line 2 : this is a tutorial Input which line you want to display :1 The content of the line 1 of the file mytest.txt is : welcome w3resource
Flowchart :
C# Sharp Code Editor:
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