How do I create arrays with different types

Question

I need my array to store a bool and string pair.

MyType[,] array1 = { {true, "apple"}, {false, "orange"} };

// Later in my code.
for (i = 0; i < array1.Length; i++)
{
    if(array1[i, 0] == true)
    {
        Console.WriteLine(array1[i, 1]);
    }
}

How do I get the above in C# without using collection? If not possible, which collection should I use?

possible duplicate of Defining two dimensional Dynamic Array with different types — Oleg Estekhin
– Oleg Estekhin, Commented Apr 29, 2015 at 5:57

Abhishek · Accepted Answer · 2015-04-29 06:25:38Z

3

Arrays can't have different datatypes. It is the design principle of Arrays. Instead, create a class/struct and then create array/list of that class. Something as following,

class MyClass
{
bool flag;
string myStr;
}

List<MyCLass> myList=new List<MyClass>();
ArrayList arrList = new ArrayList(); //or use this option

You should be able to access list using foreach in c#.

edited Apr 29, 2015 at 6:25

answered Apr 29, 2015 at 5:53

Abhishek

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4 Comments

Christopher Lim Over a year ago

yeah i thought of using list but i need to stop looping at the last value of the array or list, as I need to do some string manipulation to the last item. Edit: Reason for using array is it loops faster than list or collection.

Abhishek Over a year ago

You can get the size of list, by using myList.Count and then add if clause for the last element while running foreach. If you are worried about performance then use ArrayList. Edited answer accordingly :)

Tim Over a year ago

ArrayList? Really? I haven't run any benchmarks, but I can almost guarantee that performance with an ArrayList will be worse, because of the boxing/unboxing required. Better to use either a List<T> or a regular array of the class objects.

Abhishek Over a year ago

@Tim oops.. You are right, ArrayList will have performance issues of boxing/unboxing :|. Now, I guess OP has to go with List<T>.

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