如何在Unity C＃中的数组中添加或追加值

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?

Answer 1

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

https://docs.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");
...