Can't assign value to an array

I have an array of tiles that are of the type Texture2D and want to set each one in the array to something different.

for (int i = 1; i <= columns * rows; i++)
        {
            m_tiles[i] = new Texture2D(m_graphicsDevice, tilewidth, tileheight);
        }

It points to the error bei开发者_如何学Pythonng the closing }

I don't understand how it being null when I'm trying to set it to not be null effects it. If I can never set the variable to anything then they'll always be null.

I have tried:

Texture2D[] m_tiles = new Texture2D(m_graphicsDevice, tilewidth, tileheight)[500];

But the compiler says "Cannot apply indexing with [] to and expression of type 'Microsoft.Xna.Framework.Graphics.Texture2D'"

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You'll first need to initialize an array instance in order to assign values to its elements:

Preceed the for-loop with following statement:

Texture2D[] m_tiles = new Texture2D[columns * rows + 1];

Arrays indices are 0-based in C#, and afaik most .NET languages. So when using the indexer, you might want to loop from 0 .. n-1, instead of 1 .. n.

But honestly, I rarely ever still use arrays in .NET. If you have no specific reason to use an array, I would recommend to use a List<T> :

List<Texture2D> m_tiles = new List<Texture2D>();
for(;;)
{
  m_tiles.Add(new Texture2D(foo, bar));
}

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You need to instantiate the array first, like:

m_tiles = new Texture2D[10];

Like most other types, arrays need to be created, more specifically it needs to know how many elements you want it to have (in this case, it has 10 "slots").

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You need to initialize the array with a proper dimension.

m_tiles[] may not be initialized to receive (columns * rows) elements.

So, before your loop, you should initialize the m_titles array with this size.

Texture2D[] m_tiles = new Texture2D[columns * rows];

So, if you have 1 columns and 1 rows, it will give you 1 slot (m_tiles[0]). If you have 2 columns and 2 rows you will have 4 slots (m_tiles[0],m_tiles[1],m_tiles[2],m_tiles[3]);

You should start you loop with i = 0 otherwise, the [0] won't be assigned and an exception of index out of bound will be trigged. If you really do not want to start with 0, you can increase by 1 the size of the array using (columns * rows +1).