Accessing Elements from Multi Dimensional Array in C#

Question

Hi

I have created a Multi Dimensional Array as follows:

            List<(int, string, string, int, int, int)> QuizList = new List<(int, string, string, int, int, int)>();
            int ItemNo = 0;
            QuizList.Add((++ItemNo, "Quiz Ans 1", "Quiz Meaning 1", 1, 3, 5));
            QuizList.Add((++ItemNo, "Quiz Ans 2", "Quiz Meaning 2", 4, 2, 1));
            QuizList.Add((++ItemNo, "Quiz Ans 3", "Quiz Meaning 3", 3, 2, 4));
            QuizList.Add((++ItemNo, "Quiz Ans 4", "Quiz Meaning 4", 4, 1, 5));
            int Item1 = 1;
            int Item2 = 2;
            string ArrayString = QuizList[Item1, Item2];
            Item1 = 3;
            Item2 = 4;
            int ArrayNo = QuizList[Item1, Item2];

I would like to access various elements from the Array, but the use of ArrayString and ArrayNo are failing in my C# cde.

This may seem a very basic issue, but am struggling to make it work.

So any solutions would be welcome.

Thanks

Answer 1

@Riffy , Welcome to Microsoft Q&A, based on my test, you could access the various elements from the Array like the following:

    int Item1 = 1;  
    int Item2 = 2;  
    string ArrayString = QuizList[Item1-1].Item2;  
    Item1 = 3;  
    Item2 = 4;  
    int ArrayNo = QuizList[Item1-1].Item4;  

Best regards,
Jack

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Answer 2

The syntax is...

List<(int, string, string, int, int, int)> QuizList = new List<(int, string, string, int, int, int)>();  
int ItemNo = 0;  
QuizList.Add((++ItemNo, "Quiz Ans 1", "Quiz Meaning 1", 1, 3, 5));  
QuizList.Add((++ItemNo, "Quiz Ans 2", "Quiz Meaning 2", 4, 2, 1));  
QuizList.Add((++ItemNo, "Quiz Ans 3", "Quiz Meaning 3", 3, 2, 4));  
QuizList.Add((++ItemNo, "Quiz Ans 4", "Quiz Meaning 4", 4, 1, 5));  
          
foreach(var item in QuizList)  
{  
    Console.Write($"{item.Item1}\t");  
    Console.Write($"{item.Item2}\t");  
    Console.Write($"{item.Item3}\t");  
    Console.Write($"{item.Item4}\t");  
    Console.Write($"{item.Item5}");  
    Console.WriteLine();  
}  

I recommend creating a List<QuizItem> where QuizItem is a class with properties names rather than item1, 2, 3, etc.

https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.list-1?view=net-6.0

Answer 3

So why can I not use:

>

string ArrayString = QuizList[Item1, Item2];

int ArrayNo = QuizList[Item1, Item2];

for accessing any element in the List. I get compilation errors.

Your terminology and attempted syntax suggests that you are
confusing two entirely different types of collections.

Nowhere in your code are you using an array or Array.
You are using a List not an Array.

You are trying to use the syntax which is used to access
elements of a multi-dimensional array, which is not valid
syntax for a List.

• Wayne