create a login console app that reads data from json file named user in csharp use a list in csharp

To create a login console app that reads data from a JSON file named users and use a List in C#, you can follow these steps:

  1. Create a C# console application and add the Newtonsoft.Json NuGet package to your project.

  2. Define a User class with the properties for the user's login information, such as username and password. Use the [JsonProperty] attribute to map the properties to the JSON fields.

main.cs
using Newtonsoft.Json;

public class User
{
    [JsonProperty("username")]
    public string Username { get; set; }

    [JsonProperty("password")]
    public string Password { get; set; }
}
191 chars
11 lines
  1. Read the JSON file and deserialize it using the JSON.NET library:
main.cs
using Newtonsoft.Json;
using System.Collections.Generic;
using System.IO;

List<User> users = new List<User>();

// Read the JSON file
string jsonData = File.ReadAllText("users.json");

// Deserialize the JSON data into a List of User objects
users = JsonConvert.DeserializeObject<List<User>>(jsonData);
304 chars
12 lines
  1. Prompt the user to enter their login information and verify it against the list of users:
main.cs
// Prompt the user to enter their username and password
Console.Write("Username: ");
string username = Console.ReadLine();

Console.Write("Password: ");
string password = Console.ReadLine();

// Find the user with the matching username and password
User user = users.Find(u => u.Username == username && u.Password == password);

// Check if the user was found
if (user != null)
{
    Console.WriteLine($"Welcome, {user.Username}!");
}
else
{
    Console.WriteLine("Invalid login information.");
}
497 chars
20 lines

Note: Make sure to handle any exceptions that may occur when reading the JSON file or when deserializing it.

gistlibby LogSnag