Using Generic Method to Determine if All Elements in an Array is Zero

[mfcuser]

I want to know how to do that. I can use foreach and for loop, but I prefer to use the array class. Assume I have my array like

int[] arrayData = { 1, 3, 5, 0, 6 };

By using .All generic method, it is possible to do something like that to determine if all elements are zero

arrayData.All //this is where I have the problem

So how can I use the .All to determine if all elements in the array is 0

[Christian Graus]

The MSDN has samples, but basically you write a predicate method that returns what you want to return. For example, a search method would involve you writing the code that checks each element. Under the hood, it's not much different at the end of the day, the code that runs will use for each to check each element.

Christian Graus Driven to the arms of OSX by Vista.

[Adam Maras]

arrayData.All(item => item == 0);

[mfcuser]

How do you declare item in this case?

[Adam Maras]

item is an inline-declared parameter. You shouldn't have to explicitly declare it anywhere. Enumerable.All should be able to determine the type of the parameter at compile-time. Note: I'm not in front of my compiler right now, but it's possible (?) that you may have to explicitly provide the parameter with a type. In that case, I believe the syntax would be:

arrayData.All((int item) => item == 0);

(disclaimer: this is all coming from memory, so I might not be spot-on :doh:)

[mfcuser]

It seems to work fine now

[mfcuser]

Your method works fine, but it looks like it is not possible to check if all elements equal 0 in a 2D array. I couldn't find a way to do that for a 2D array as I did for a 1D. Is there a way to check if all elements is 0 in a 2D array?