C#: Create and write some line of text which does not contain a given string in a line
Write a C# Sharp program to create and write some lines of text into a file. This does not contain a given string on a line.
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
string str; // Declaring a string variable for input string to ignore
int n, i; // Declaring variables for counting lines and iterating
Console.Write("\n\n Create and write some line of text which does not contain a given string in a line :\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 the string to ignore the line : "); // Prompting the user to input a string
str = Console.ReadLine(); // Reading the string to ignore
Console.Write(" Input number of lines to write in the file : "); // Prompting the user to input the number of lines
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 lines to the file, excluding those containing the given string to ignore
using (System.IO.StreamWriter file = new System.IO.StreamWriter(@"mytest.txt"))
{
foreach (string line in ArrLines)
{
if (!line.Contains(str)) // Writing the line to the file if it doesn't contain the specified string
{
file.WriteLine(line);
}
}
}
using (StreamReader sr = File.OpenText(fileName)) // Opening a StreamReader to read the content of the file
{
string s = "";
Console.Write("\n The line has been ignored if it contains the string '{0}'. \n", str); // Displaying a message about ignored lines
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 and write some line of text which does not contain a given string in a line :
------------------------------------------------------------------------------------------
Input the string to ignore the line : easy
Input number of lines to write in the file : 2
Input 2 strings below :
Input line 1 : w3resource
Input line 2 : it is easy tutorial
The line has ignored which contain the string 'easy'.
The content of the file is :
----------------------------------
w3resource
Flowchart :
C# Sharp Code Editor:
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