I'm looking for a code to check if an element of my array of double is empty. I tried with isNaN
, string.isNullOrEmpty
and 0.0D
but nothing to do, I still have this text : Not a Number.
So, do you know any code in C# which is able to check if an element in a an array of double is empty?
Here is my code:
if (!Double.IsNaN(d1.getChiffreAffaireBase()[keyIndex1]))
{
textBox43.Text = calcMargeCa(d1.getChiffreAffaireBase()[keyIndex1], d1.getChiffreAffairePlus()[keyIndex1]).ToString("0.00");
textBox44.Text = calcMargeCa(d1.getChiffreAffaireBase()[keyIndex1+1], d1.getChiffreAffairePlus()[keyIndex1+1]).ToString("0.00");
}
else
{
label13.Hide();
textBox43.Hide();
textBox44.Hide();
}
if you declare an array like this
double[] array = new double[12]; // elements cannot be null
all elements will be set to 0
.
Declare it as nullable
, if you really want
var array = new double?[12]; // elements can be null
var isEmpty = (array[6] == null);
or
var isEmpty = !array[6].HasValue;
Value types cannot not have a value (that is to say, they cannot be null
) but you could use a Nullable<double>
(or double?
for short) which can be set to null
if you want to indicate that it doesn't have a value. Here's an example:
double?[] array = new double?[12];
then for checking if it has a value you compare it to null
:
if (array[6] == null){
// do your thing
}
Edit:
Off topic but now that you've posted your code I see that you're using double
to represent money (Chiffre d'Affaire or Revenue) while that could work, you should use decimal
instead
Double.IsNaN doesn't check for null values , check this for more or read the documentations about it https://stackoverflow.com/a/7967190/6001737
instead you can use double?[] array = new double?[12];
which is Nullable and you can then check if a certain array value equals null
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