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c#arrays
TheWebs
TheWebs

Reputation: 12923

Merging Arrays or Appending to an array

In C# I have three arrays, string[] array1, 2 and 3 and they all have differnt values. I would love to do what I can do in php which is:

$array = array(); $array[] .= 'some value';

Whats the equivalent way of doing this in C#?

Upvotes: 0

Views: 208

Answers (6)

Reed Copsey
Reed Copsey

Reputation: 564413

In C#, you'd typically use a List<string> instead of string[].

This will allow you to write list.Add("some value") and will "grow" the list dynamically.

Note that it's easy to convert between a list and an array if needed. List<T> has a constructor that takes any IEnumerable<T>, including an array, so you can make a list from an array via:

var list = new List<string>(stringArray);

You can convert a list to an array via:

var array = list.ToArray();

This is only required if you need an array, however (such as working with a third party API). If you know you're going to work with collections that vary in size, it's often better to just always stick to List<T> and not use arrays.

Upvotes: 7

Dave Bish
Dave Bish

Reputation: 19646

Easy with linq:

int[] array1 = { 1, 2, 3, 4, 5 };
int[] array2 = { 6, 7, 8, 9, 10 };
int[] array3 = { 3, 4 ,5, 9, 10 };

var result = array1
    .Concat(array2)
    .Concat(array3)
    .ToArray();

Upvotes: 0

Manish Mishra
Manish Mishra

Reputation: 12375

if you simply want to merge your arrays

use linq .Concat

 array1 = array1.Concat(array2).Concat(array3).ToArray();

Upvotes: 0

Joe Enos
Joe Enos

Reputation: 40393

List<T> or LINQ may be the easiest solutions, but you can also do it the old fashioned way:

// b1 is now 5 bytes
byte[] b1 = Get5BytesFromSomewhere();

// creating a 6-byte array
byte[] temp = new byte[6];

// copying bytes 0-4 from b1 to temp
Array.copy(b1, 0, temp, 0, 5);

// adding a 6th byte
temp[5] = (byte)11;

// reassigning that temp array back to the b1 variable
b1 = temp;

Upvotes: 0

Kurubaran
Kurubaran

Reputation: 8902

You can create a list and add the array values to it and then convert that list back to array.

int[] array1 = { 1, 2, 3, 4, 5 };
int[] array2 = { 6, 7, 8, 9, 10 };

// Create new List of integers and call AddRange twice
var list = new List<int>();
list.AddRange(array1);
list.AddRange(array2);

// Call ToArray to convert List to array
int[] array3 = list.ToArray();

Upvotes: 2

Daniel M&#246;ller
Daniel M&#246;ller

Reputation: 86600

You could use dinamic lists List<string>. You can do

List<string> TotalList = array1.ToList();

Then you can TotalList.AddRange(array2) and so on....

Upvotes: 0

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