CODEWITHSUNDEEP
arrayslinqmultidimensional-arraydimensions
KrisTrip
KrisTrip

Reputation: 5043

Use LINQ to get length of dimensions of Array

I have an array of which I would like to get the length of each dimension stored in an array. I.e. I would like something like the following:

Array myArray = //...Blah blah myArray is defined somewhere in code

int[] dimLengths = myArray.SomeLinqStatement...

I can do this with some for loop(s) but I was hoping there would be a simple linq statement. So for example, if myArray is a 3D array of 2x3x4 I want dimLengths to be {2, 3, 4}.

Upvotes: 1

Views: 1419

Answers (2)

Tim Schmelter
Tim Schmelter

Reputation: 460118

Why do you need LINQ to get the length of an `Array's dimensions?

myArray.GetLength(0); //returns the length of the first dimension
myArray.GetLength(1); //returns the length of the second dimension
myArray.GetLength(2); //returns the length of the third dimension

Array.GetLength Method

Here's your "sexy" LINQ approach:

int[, ,] array3D = new int[,,] { { { 1, 2, 3 }, { 4, 5, 6 } }, 
                             { { 7, 8, 9 }, { 10, 11, 12 } } };
var result = Enumerable.Range(0, array3D.Rank)
      .Select(i => array3D.GetLength(i))
      .ToArray();

Upvotes: 1

Kendall Frey
Kendall Frey

Reputation: 44326

You don't need LINQ. Here is a simple solution:

int[] GetDimensions(Array array)
{
    int[] dimensions = new int[array.Rank];
    for (int i = 0; i < array.Rank; i++)
    {
        dimensions[i] = array.GetLength(i);
    }
    return dimensions;
}

If you must use LINQ, you could try this, though I am sure the other way is better:

int[] dimensions = Enumerable.Range(0, array.Rank)
                             .Select(i => array.GetLength(i))
                             .ToArray();

Upvotes: 1

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