- C# Introduction
- C# Comments
- C# - The .Net Framework
- C# - Integrated Development Environment (IDE) for C#
- C# - .Net Core 8.0
- C# - Variables
- C# - Identifiers in Details
- C# - Memory Allocation for Data Types
- C# - Datatypes
- C# Strings
- C# - String and String Bulder in C#
- C# - Common String Methods Part 1
- C# - Common String Methods - Part 2
- C# - Split Methods
- C# - String Interview Questions
- C# - Special Characters
- C# Type Casting
- C# - Type Casting in C#
- C# - Boxing /Unboxing and Is/AS Operator
- C# Type Conversion
- C# - Conversion Methods
- C# - Parsing Methods
- C# - Custom Conversion Methods
- C# Operators
- C# - What are the C# operators available?
- C# - Assignment Operators
- C# - Comparison Operators
- C# - Logical Operators
- C# - Arithmetic Operators
- C# Math
- C# - What is C# Math
- C# - Trigonometric Functions
- C# - Math.Round()
- C# Boolean Values
- C# - What is a Boolean Value
- C# - Boolean Expression
- C# Conditions and If Statements
- C# - The If Statement
- C# - Ternary Operator
- C# Switch Statements
- C# - What is Switch Statement
- C# - Switch Keyword in depth
- C# Loops
- C# - What are Loops
- C# - Loop Over Arrays
- C# - Performance comparison between different loops
- C# Break
- C# - What is Break
- C# - Continue
- C# Arrays
- C# - Create an Array
- C# - Array in Details
- C# - Array of Class object
- C# - CRUD Operations on Arrays
- C# - Memory allocation for arrays
- C# - Array Pools in C#
- C# - Sort Arrays
- C# - Array Programs and interview questions
- C# Methods
- C# - Create a Method
- C# - Call a Method
- C# Method Parameters
- C# - Parameters and Arguments
- C# - Default Parameter Value
- C# - Multiple Parameters
- C# - Named Arguments
- C# - Method Overloading
- C# OOPS
- C# - What is OOP and Classes?
- C# - Abstraction
- C# - Inheritance
- C# - Polymorphism
- C# - Virtual and Override Keyword
- C# - Memory Allocation for Classes
- C# - Multiple and Multilevel Inheritance
- C# - Protected Internal With Real Time Use case
- C# - Question and Answers in OOPS
- C# Constructors
- C# - What is a Constructor
- C# - Type of Constructor
- C# - Primary constructors
- C# - Constructor Q & A
- C# Properties
- C# - Properties
- C# - Read and Write only Properties
- C# - Automatic Properties (Short Hand)
- C# - Computed Properties
- C# - 12 Properties
- C# - The Sealed Keyword
- C# - Static Keyword
- C# - Static Class
- C# - Question on Static Classes
- C# - Interfaces
- C# - Enum
- C# Files
- C# - Working With Files
- C# - Write To a File and Read It
- C# Exceptions
- C# - Handling Exception
- C# - Try and Catch
- C# - Throw keyword
C# - Working With Files
Files in C#
The File class from the System.IO namespace, allows us to work with files
We can do read and write operation to text files.
Working With Files in C#
using System.IO; // include the System.IO namespace
here we will read text data from text file and then we will parse into class
Sample file content, we will read with C# code
devesh, devesh.omar@gmail.com.com, Developer
Pankaj Kumar, pk@yahoo.com, Manager
Sanjay kumar, sg1@gmail.com, Analyst
Code
public class Employee
{
public string Name { get; set; }
public string Email { get; set; }
public string Position { get; set; }
}
public class EmployeeService
{
public List<Employee> ReadEmployeesFromFile(string filePath)
{
var employees = new List<Employee>();
var lines = File.ReadAllLines(filePath);
foreach (var line in lines)
{
var parts = line.Split(',');
if (parts.Length == 3)
{
var employee = new Employee
{
Name = parts[0].Trim(),
Email = parts[1].Trim(),
Position = parts[2].Trim()
};
employees.Add(employee);
}
}
return employees;
}
}
Program .cs
using Csharp12;
var employeeService = new EmployeeService();
var employees = employeeService.ReadEmployeesFromFile(@"C:\SampleFiles\Sample.txt");
Console.WriteLine("Welcome to letsupdateskills.com ");
Console.WriteLine("............................... ");
foreach (var employee in employees)
{
Console.WriteLine($"Name: {employee.Name}, Email: {employee.Email}, Position: {employee.Position}");
}
Console.ReadKey();
Output
Welcome to letsupdateskills.com
...............................
Name: devesh, Email: devesh.omar@gmail.com.com, Position: Developer
Name: Pankaj Kumar, Email: pk@yahoo.com, Position: Manager
Name: Sanjay kumar, Email: sg1@gmail.com, Position: Analyst
The File class has many useful methods for creating and getting information about files.
Methods in files in C#
For a full list of File methods, go to Microsoft .Net File Class Reference.
Method Description
- AppendText() Appends text at the end of an existing file
- Copy() Copies a file
- Create() Creates or overwrites a file
- Delete() Deletes a file
- Exists() Tests whether the file exists
- ReadAllText() Reads the contents of a file
- Replace() Replaces the contents of a file with the contents of another file
- WriteAllText() Creates a new file and writes the contents to it. If the file already exists, it will be overwritten.
