static void AddContact()
{
string path = @"C:\Users\...\Desktop\Projekte\C# Übungen\ContactList/contacts.txt";
string name, address;
int phoneNumber;
bool addingContact = true;
string response;
List<string> ContactList = File.ReadAllLines(path).ToList();
while(addingContact)
{
System.Console.Write("Name: ");
name = Console.ReadLine();
System.Console.Write("Nummer: ");
phoneNumber = int.Parse(Console.ReadLine());
System.Console.Write("Adresse: ");
address = Console.ReadLine();
ContactList.Add($"Name: {name}");
ContactList.Add($"Nummer: {phoneNumber}");
ContactList.Add($"Adresse: {address} \n---------------------------------");
foreach (var contact in ContactList)
{
File.WriteAllLines(path, ContactList);
}
Console.Clear();
System.Console.WriteLine("Contact added successfully! Would you like to Add another Contact? (y)(n)");
response = Console.ReadLine().ToLower();
if(response == "y")
{
Console.Clear();
}
else
{
addingContact = false;
}
}
Console.WriteLine("Good bye!");
}
static void ShowContact()
{
string path = @"C:\Users\...\Desktop\Projekte\C# Übungen\ContactList/contacts.txt";
string response;
System.Console.WriteLine("Would you like to see all contacts (0) or a specific one (1)?");
response = Console.ReadLine();
switch (response)
{
case "0":
File.ReadAllLines(path);
break;
case "1":
System.Console.WriteLine("Type the name of the user: ");
string username = Console.ReadLine();
File.ReadAllLines(path)
break;
}
}
Thats everything. In the switch Statement at case 1 is where the problem is. I want it to look something like this if the user types John for example:
Name: John
Number: 233
Address: lolol 23
I already tried out something but i stopped in the middle of writing it because i realized that i dont actually know how to code that so i made my way over to stackoverflow to ask for help, thanks. Please be polite and i know that this code isnt the best, im a beginner.
Edit: I just found out that ShowContacts doesnt work at all
Edit 2: Fixed it with a foreach loop and List
List<string> contacts = File.ReadAllLines(path).ToList();
System.Console.WriteLine("Would you like to see all contacts (0) or a specific one (1)?");
response = Console.ReadLine();
switch (response)
{
case "0":
foreach (var contact in contacts)
{
Console.WriteLine(contact);
}
break;
}
CodePudding user response：
Save your contact to json format, like this:
using System;
using System.Collections.Generic;
using System.Text.Json;
using System.IO;
namespace JsonTester
{
// Open the Package Manager Console:
// VS2022 >> Tools >> Nuget Package Manager >> Package Manager Console
//
// Install libraries through Package Manager Console (look at bottom of VS2022):
// PM > Install-Package System.Text.Json -Version 6.0.1
// After type above, then press Enter to install json
internal class Program
{
static List<Contact> contactList = new List<Contact>();
static readonly string MY_CONTACT = @"D:\MyContact.txt";
class Contact {
public string Name { get; set; }
public string Number { get; set; }
public string Address { get; set; }
}
static void EnterContact() {
while (true)
{
Console.WriteLine("Enter Contact? [Y/N]");
string key = Console.ReadLine();
if (key.ToLower() == "y")
{
var contact = new Contact();
Console.WriteLine("Name: ");
contact.Name = Console.ReadLine();
Console.WriteLine("Number: ");
contact.Number = Console.ReadLine();
Console.WriteLine("Address: ");
contact.Address = Console.ReadLine();
contactList.Add(contact);
}
else {
break;
}
}
}
static void SaveContact() {
if (contactList.Count > 0) {
foreach (Contact contact in contactList) {
String strContactJson = JsonSerializer.Serialize(contact);
File.AppendAllText(MY_CONTACT, strContactJson "\n");
}
}
}
static void ReadContact()
{
try
{
String[] strContactJsonArr = File.ReadAllLines(MY_CONTACT);
if (strContactJsonArr.Length > 0)
{
foreach (String s in strContactJsonArr)
{
Contact contact = JsonSerializer.Deserialize<Contact>(s);
if (contact != null)
{
Console.WriteLine("Name: " contact.Name);
Console.WriteLine("Number: " contact.Number);
Console.WriteLine("Address: " contact.Address);
Console.WriteLine("");
}
}
}
}
catch (Exception) {
}
}
static void Main(string[] args)
{
ReadContact();
EnterContact();
SaveContact();
}
}
}
Console Output:
MyContact.txt (contact save in JSON format)
CodePudding user response：
Okay, if each item is broken down by three values consider chunking the data by three than iterate the results.
Change the Debug.WriteLine to Console.WriteLine below for your code.
Extension method for chunking
public static class ListExtensions
{
public static List<List<T>> ChunkBy<T>(this List<T> source, int chunkSize)
=> source
.Select((value, index) => new { Index = index, Value = value })
.GroupBy(x => x.Index / chunkSize)
.Select(grp => grp.Select(v => v.Value).ToList())
.ToList();
}
File contents
John
111
John's address
Mary
222
Mary's address
Bill
333
Bill's address
Code to first assert data is divisible by three than read the data, no assertion of data types or if null values are performed.
var contents = File.ReadAllLines("TextFile1.txt");
if (contents.Length % 3 == 0)
{
var results = contents.ToList().ChunkBy(3);
foreach (var list in results)
{
Debug.WriteLine($" Name: {list[0]}");
Debug.WriteLine($" Number: {list[1]}");
Debug.WriteLine($"Address: {list[2]}");
}
}
else
{
Debug.WriteLine("Malformed");
}
Edit: placed into a method
private static void ViewAllContacts()
{
var fileName = "TextFile1.txt";
if (File.Exists(fileName))
{
var contents = File.ReadAllLines(fileName);
if (contents.Length % 3 == 0)
{
var results = contents.ToList().ChunkBy(3);
foreach (var list in results)
{
Debug.WriteLine($" Name: {list[0]}");
Debug.WriteLine($" Number: {list[1]}");
Debug.WriteLine($"Address: {list[2]}");
}
}
else
{
Debug.WriteLine("Malformed");
}
}
else
{
Debug.WriteLine($"{fileName} not found");
}
}