CODEWITHSUNDEEP
c#arrayslistlinq
Cambaru
Cambaru

Reputation: 93

How do I get first element of each array via Linq C#

I'm very new to Linq and having a problem with this code:

double[] values;
private List<double[]> valueList = new List<double[]>();
void AddNewValues(double d1, double d2, double d3)
{
   values[0] = d1;
   values[1] = d1;
   values[2] = d1;
   valueList.Add(values);
}

void GetAllFirstValues()
{
   var test = valueList.Where(s => s == typeof(double[0]));
}

How to get the first item of each array inside the list?

Is that even possible? Is Linq here a proper way to do that or is there a more clever solution?

Upvotes: 1

Views: 9237

Answers (1)

Johnny
Johnny

Reputation: 9509

This should be System.Linq, you don't need to check for type. It will select first or default if array is empty and return it.

IEnumerable<double> d =  l.Select(array => array.FirstOrDefault())

or, if you want to filter only non empty arrays:

IEnumerable<double> d = l.Where(array => array.Any()).Select(array => array.First());

Be aware that array also can be null, so you can even filter that out within the Where clause.

Upvotes: 10

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