C# - Dynamically create array of which the amount of indexes are variable

Question

I have a program that uses:

// the assignments of hardcoded ids and memoryIndex are for the sake of this question
int id1 = 1;
int id2 = 2;
int id3 = 3;
int id4 = 4;
int memoryIndex = 0;

int[][][] sequence;

sequence[id1][id2][id3] = memoryIndex;

I want to use something dynamic with a variable amount of keys defined at runtime, so I could also have 4 or more ids that belong to a sequence. I can't afford a lot of checks because speed is a greater concern than memory. How could I accomplish this in C#?

What does that mean: "I want to use something dynamic"?

astidham2003
– astidham2003

2016-08-27 01:14:39 +00:00
Commented Aug 27, 2016 at 1:14 — astidham2003
– astidham2003, Commented Aug 27, 2016 at 1:14
@Gaber-ber defined at runtime.

oddRaven
– oddRaven

2016-08-27 01:15:29 +00:00
Commented Aug 27, 2016 at 1:15 — oddRaven
– oddRaven, Commented Aug 27, 2016 at 1:15

astidham2003 · Accepted Answer · 2016-08-27 01:35:12Z

I would say take a look at the C# Array class. It has several methods for creating arrays with multiple dimensions. For example, Array.CreateInstance Method (Type, Int32[]) where the second parameter is an array indicating the length of each dimensions. A sample using your code would look like this:

int id1 = 1;
int id2 = 2;
int id3 = 3;
int id4 = 4;

int[] dimensions = {2, 3, 4, 5};
int memoryIndex = -1;

var sequence = Array.CreateInstance(typeof(int), dimensions);

sequence.SetValue(memoryIndex, new int[]{id1, id2, id3, id4});

Here's a link to the documentation: https://msdn.microsoft.com/en-us/library/dfs8044k(v=vs.110).aspx

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