How to add or append value in array in Unity C#

Question

How can I create a string array in class?

Also I have to add or append values to that array.

I can use Firebase real-time database to store array values in database.

Not to a specific key.

I declared array as:

private string[] uiddata;

That array is useed in a for loop and add elements to the array as

public void Click()
{
    _uid = int.Parse(_uidText.text);

    for(int i = 0; i < uiddata.Length;i++)
    {
        uiddata.Add(_uid);

        //_score = int.Parse(_scoreText.text);

        _uidRef.SetValueAsync(_uid);
        //_scoreRef.SetValueAsync(_score);

        _uidRef.RunTransaction(data =>
        {
            data.Value =_uid ;
            return TransactionResult.Success(data);
        }).ContinueWith(task =>
        {
            if (task.Exception != null)
                Debug.Log(task.Exception.ToString());
        });
    }
}

In the script above I try to add my value in the array but gives this error:

error CS1061: Type string[] does not contain a definition for Add and no extension method Add of type string[] could be found. Are you missing an assembly reference?

Ignacio Alorre · Accepted Answer · 2017-09-28 05:43:30Z

7

Since you are using C#, you should check this:

https://learn.microsoft.com/en-us/dotnet/csharp/programming-guide/arrays/

Exactly this part:

The number of dimensions and the length of each dimension are established when the array instance is created. These values can't be changed during the lifetime of the instance.

So it means you can define a size at the beginning, for example 5, and then you can add values to the array like follow:

String[] numbers = new String[5];
numbers[0] = "hello1";
numbers[1] = "hello2";
numbers[2] = "hello3";
numbers[3] = "hello4";
numbers[4] = "hello5";

or

 String[] words = new String[] {"hello1", "hello2", "hello3", "hello4", "hello5" };

But if you try to add an extra element to this array you will have an exception

numbers[5] = 111111; //Exception here

But if you need append values, you can use collections instead of arrays. For example a List:

List<String> myList = new List<String>();
myList.Add("Value1");
myList.Add("Value2");
...

edited Sep 28, 2017 at 5:43

answered Sep 28, 2017 at 5:27

Ignacio Alorre

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2 Comments

Ignacio Alorre Over a year ago

You can not, the unity engine use other programming language, as I see in your case it is c#, and as I explained you it is not possible. You need to use list. Try to use ArrayList as I say in the example, and there you can use the method .Add("value") to add elements when you need.

Ignacio Alorre Over a year ago

So check the last part of my answer, and declare uiddata as an ArrayList, not as an Array

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