What is wrong here?
string[] keysDictionary = new string[]{};
keysDictionary [0] = "test";
I get
System.IndexOutOfRangeException Array index is out of range.
5 Answers
You can't add anything to a 0 length array. You are essentially trying to set the value of the first element of an array with no elements. Use something like a list instead if you want to do this, arrays cannot be resized.
var keysDictionary = new List<string>();
keysDictionary.Add("test");
2 Comments
Jazimov
How can this answer have upvotes when it won't even compile due to the typo in line 2?
Ozgun Senyuva
Because it is just a typo. Answer is already clear without compiling.
By stating {} you are defining this as an empty array.
Thus you should either define the size as:
string[] keysDictionary = new string[1];
keysDictionary [0] = "test";
Or
Initialize like this:
string[] keysDictionary = new string[]{"test"};
Comments
new string[]{} creates zero-length array
Comments
You need to specify the size of the array.
e.g.
string[] keysDictionary = new string[1];
keysDictionary [0] = "test";
Comments
If you want an Array that dynamically changes size when you add values use a List instead.
3 Comments
Coding Flow
ArrayList is a bit .net 1.1, more commonly you would use List<T>
Le Ish Man
Sorry I'm too used to Java I just assumed C# had a similar feature
Andrey Korneyev
using Arraylist is not recommended from the moment of generics implementation in c#
new string[length]List<T>. It's an array-like structure that allows the addition of more elements.C#is a high level language it still has some very basic constructs, like fixed arrays which you are trying to use. Only use arrays (ie ´type[]´ syntax likeint[]) when you create a fixed collection you are going to be iterating over many times. In my opinion, for all other cases the performance gain is not worth the hassle of keeping track of the array size manually.