Lære Validating User Input | Validating Input and Safe Parsing

C# Exceptions and Error Handling Practice

Program.cs


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using System;

namespace ConsoleApp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Console.Write("Enter your age: ");
            string input = Console.ReadLine();
            int age;

            if (!int.TryParse(input, out age) || age <= 0)
            {
                Console.WriteLine("Invalid input. Age must be a positive integer.");
            }
            else
            {
                Console.WriteLine($"Your age is: {age}");
            }
        }
    }
}

ValidationExamples.cs


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// This file is for illustration only and is not meant to be run directly.

using System.Text.RegularExpressions;

public class ValidationExamples
{
    // Email format validation
    public bool IsValidEmail(string email)
    {
        // Simple pattern for demonstration; real validation may require more checks
        return Regex.IsMatch(email, @"^[^@\s]+@[^@\s]+\.[^@\s]+$");
    }

    // Password strength validation
    public bool IsStrongPassword(string password)
    {
        // At least 8 characters, one uppercase, one lowercase, one digit
        return password.Length >= 8
            && Regex.IsMatch(password, @"[A-Z]")
            && Regex.IsMatch(password, @"[a-z]")
            && Regex.IsMatch(password, @"\d");
    }
}

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Suggested prompts:

Can you explain how the regular expression for email validation works?

What are some common mistakes to avoid when validating passwords?

Can you show more examples of input validation in C#?

Sveip for å vise menyen

Program.cs


              123456789101112131415161718192021222324
            
using System;

namespace ConsoleApp
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Console.Write("Enter your age: ");
            string input = Console.ReadLine();
            int age;

            if (!int.TryParse(input, out age) || age <= 0)
            {
                Console.WriteLine("Invalid input. Age must be a positive integer.");
            }
            else
            {
                Console.WriteLine($"Your age is: {age}");
            }
        }
    }
}

ValidationExamples.cs


              123456789101112131415161718192021222324
            
// This file is for illustration only and is not meant to be run directly.

using System.Text.RegularExpressions;

public class ValidationExamples
{
    // Email format validation
    public bool IsValidEmail(string email)
    {
        // Simple pattern for demonstration; real validation may require more checks
        return Regex.IsMatch(email, @"^[^@\s]+@[^@\s]+\.[^@\s]+$");
    }

    // Password strength validation
    public bool IsStrongPassword(string password)
    {
        // At least 8 characters, one uppercase, one lowercase, one digit
        return password.Length >= 8
            && Regex.IsMatch(password, @"[A-Z]")
            && Regex.IsMatch(password, @"[a-z]")
            && Regex.IsMatch(password, @"\d");
    }
}

Alt var klart?

Takk for tilbakemeldingene dine!

Seksjon 3. Kapittel 1