programming-examples/c-sharp/Files/C# Sharp to read a specific line from a file.cs
2019-11-15 12:59:38 +01:00

45 lines
1.5 KiB
C#

using System;
using System.IO;
class filexercise13
{
static void Main()
{
string fileName = @"mytest.txt";
string[] ArrLines ;
int n,i,l;
Console.Write("\n\n Read a specific line from a file :\n");
Console.Write("----------------------------------------\n");
if (File.Exists(fileName))
{
File.Delete(fileName);
}
Console.Write(" Input number of lines to write in the file :");
n= Convert.ToInt32(Console.ReadLine());
ArrLines=new string[n];
Console.Write(" Input {0} strings below :\n",n);
for(i=0; i<n; i++)
{
Console.Write(" Input line {0} : ",i+1);
ArrLines[i] = Console.ReadLine();
}
System.IO.File.WriteAllLines(fileName, ArrLines);
Console.Write("\n Input which line you want to display :");
l = Convert.ToInt32(Console.ReadLine());
if(l>=1 && l<=n)
{
Console.Write("\n The content of the line {0} of the file {1} is : \n",l,fileName);
if (File.Exists(fileName))
{
string[] lines = File.ReadAllLines(fileName);
Console.WriteLine(" {0}",lines[l-1]);
}
}
else
{
Console.WriteLine(" Please input the correct line no.");
}
Console.WriteLine();
}
}