Like in PHP and some other languages, is there a way to add a value to an array without specifying the index?
int[] aWhich = {};
aWhich[] = 1;
Thanks.
5 Answers
Not to an Array or any other type since the indexer operator must have at least one parameter (through it does not have to be an int).
You can add to the end of a List, though:
List<int> aWhich = new List<int>();
aWhich.Add(1);
Comments
First of all you have to specify the maximum number of values that the array can hold:
int[] MyArray = new int[14];
Here 14 is the maximum number of values that MyArray can hold.
int value = 0;
void MyFuntion(){
MyArray[value] = 1;
value++;
}
In this way you can add values without specifying index number it will automatically put the index.
Comments
You can't. Arrays in C# (and .NET) are immutable (in terms of their size, not necessarely their content) and you access their values by the index. What's you are looking for is a List, ArrayList or something that might suits your need better in the System.Collections or System.Collections.Generic namespaces.
3 Comments
user7116
Nobody is looking for an ArrayList, ever.
Simon Belanger
@user7116 I agree, but it's still an option. Easier to understand than genericity from a beginner perspective.
user7116
We call that, "setting them up for failure."
There is one other way, Fist add elements to a List, then convert it into array.
Eg:
var intList = new List<int>();
intList.Add(1);
intList.Add(2);
var intArray = intList.ToArray();
Comments
Edit: this method does NOT work for adding a new array item.
myArray[myArray.Length] = newArrayItem;
.Length - # will work for overwriting array items.
4 Comments
knile
this can't work. If you specify array of 5 elements then it will try to add new item to the 5th place and you will get exception.
theRPGmaster
@knil4_crack I'm by no means an experienced C# programmer, but I'm fairly sure I used this technique successfully in a previous project. Although I don't remember in what context. Maybe it works, just not in the way I described? Or I'm just wrong.
knile
is this what you mean? Give it a shot dotnetfiddle.net/zAJcm0
theRPGmaster
@knil4_crack I can't find the use of Length in my most recent C# project. I might have switched to using a list instead of an array, I can't remember why, but it seems you're right.
List<int>?ArrayListoutside of old legacy apps. You should be usingList.