将项添加到Jagged数组

Question

I have already looked at some array topics but I am still stumped.

I wish to add a new line to my jagged array - and am strugigng to get the syntax right..

        int[][] intJaggedArray = new int[7][];

        intJaggedArray[0] = new int[3] { 1, 1, 1 };
        intJaggedArray[1] = new int[3] { 2, 2, 2 };
        intJaggedArray[2] = new int[3] { 3, 3, 3 };
        intJaggedArray[3] = new int[3] { 4, 4, 4 };
        intJaggedArray[4] = new int[3] { 5, 5, 5 };
        intJaggedArray[5] = new int[3] { 6, 6, 6 };
        intJaggedArray[6] = new int[3] { 7, 7, 7 };

So now if i want to add

        intJaggedArray[0] = new int[3] { 1, 1, 2 };

so the array ends up being as shown below how do I acheive it - thanks in advance - A noob from England. (And a big thanks in advance)

        intJaggedArray[0] = new int[3] { 1, 1, 1 };
        intJaggedArray[0] = new int[3] { 1, 1, 2 };
        intJaggedArray[1] = new int[3] { 2, 2, 2 };
        intJaggedArray[2] = new int[3] { 3, 3, 3 };
        intJaggedArray[3] = new int[3] { 4, 4, 4 };
        intJaggedArray[4] = new int[3] { 5, 5, 5 };
        intJaggedArray[5] = new int[3] { 6, 6, 6 };
        intJaggedArray[6] = new int[3] { 7, 7, 7 };

Answer 1

You might want to create a collection or a List<int[]>

Then you could insert an item into it at a certain index.

List<int[]> x = new List<int[]>();
x.Insert(3, new int[3] { 1, 2, 3 });

Answer 2

What do you want to do? Insert a line between 0 and 1? Or replace the existing line 0?

Your line :

intJaggedArray[0] = new int[3] { 1, 1, 2 }; 

simply replaces the existing line 0.

You can't insert a line in an array. To do so, use a list instead:

List<int[]> myList = new List<int[]>();
myList.Add(new int[] {...});
myList.Add(new int[] {...});
myList.Add(new int[] {...});

...

myList.Insert(1, new int[] {...});

Or if you want to replace the existing line, then simply:

Answer 3

If you want the initial list to be of a variable length, you cannot use an array. Use a List instead.

This should work:

List<int[]> intJaggedList = new List<int[]>();
intJaggedList.Add( new int[3] { 1, 1, 1 } );
intJAggedList.Add( new int[3] { 2, 2, 2 } );
...

Then to insert your new array:

intJaggedList.Insert( 1, new int[3] { 1, 1, 2 } );