Questions

Julia

1. How can i save in an array something, so i can use it in the future?
2. how can i print a few records from the array
3. how can i delete a record from the array?

please give examples so i can understand

6 Replies

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fawzan mohamed15y ago
Better option to save something is to go for a text file or DB.
0
Julia15y ago
ok, i'll take a look.... thank you both...
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Sam Hobbs15y ago
Go to this web site's home page and look at the articles and tutorials there. There are very many useful and educational artilces. My aticle Using CSV and Other Delimited Files in C# shows one way to read and write data, but there are many more.

There are many ways to write data and read it back in. You can use simple strings in separate records as Vulpes shows. You can use a delimited text format such as CSV as in my article. You can use XML and you can use a database. There are many articles for all of that for you to read and study.
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Vulpes15y ago
This is how to save the array elements to a file and then load them back in again:

using System;
using System.IO;

class Program
{
static void Main()
{
// create and initialize string array with 3 elements
string[] array = {"Red", "Green", "Blue"};

// print first and third elements, note that indexing starts from 0
Console.WriteLine(array[0]);
Console.WriteLine(array[2]);

// you can't delete an element from the array but you can set it to null
array[1] = null;
Console.WriteLine(array[1]);

// save array elements to file
array[1] = "Orange";
File.WriteAllLines("julia.txt", array);

// load them back to a different array
string[] array2 = File.ReadAllLines("julia.txt");
foreach(string color in array2) Console.WriteLine(color);

Console.ReadKey();
}
}
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Julia15y ago
you didn't tell me about how i can save for instance 3 records. I want to don't lose them when i close the console....
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Vulpes15y ago
This short program should (hopefully) answer your questions:

using System;

class Program
{
static void Main()
{
// create and initialize string array with 3 elements
string[] array = {"Red", "Green", "Blue"};

// print first and third elements, note that indexing starts from 0
Console.WriteLine(array[0]); // Red
Console.WriteLine(array[2]); // Blue

// you can't delete an element from the array but you can set it to null
array[1] = null;
Console.WriteLine(array[1]); // (Blank)

Console.ReadKey();
}
}

If you want to create a dynamic array (i.e. one that can change its size as new elements are added and from which you can delete elements), then you should use an ArrayList or a generic List instead.
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