如何使用访问器设置此变量？

Question

Should I even use accessors? If not, how can I do this?

I am trying to load a texture in my game under LoadContent() , then trying to pass this into Update() so I can use it for collision detection purposes in another class.

Here is my code:

Game1.cs

public class GetTileType
{
    public Texture2D dirt;
    public Texture2D Dirt
    {
        get
        {
            return dirt;
        }

        set
        {
            dirt = value;
        }
    }
}

public class Main : Game
{
GetTileType getTileType = new GetTileType();

protected override void LoadContent()
{

    getTileType.Dirt = Content.Load<Texture2D>("Dirt");
}

protected override void Update(GameTime gameTime)
{
    Texture2D dirt = getTileType.Dirt;

    player.GetTileType(dirt);

    base.Update(gameTime);
}

Player.cs (holds collision information for now)

public void GetTileType(Texture2D groundTexture)
{
    Tile tile = (Tile)Main.currentLevel.GetTile(0, 0);

    Texture2D texture = tile.Texture;

    if (texture == groundTexture)
    {
        // Write code to handle what to do if the player tries to enter the ground.
    }
}
}

There's more in LoadContent() , but it's irrelevant to this problem. Same for Update() . In debug, player.GetTileType(dirt); comes up as null. It should be "Dirt" if I'm not mistaken.

I feel I am going about this all wrong, but I can't think of any other way to do it. Everything else I've tried turned into a dead-end.

When I start the game, it loads, then just hangs. I have to stop it form the task manager then.

Can anyone tell me what I'm doing wrong? Thank you very much.

Answer 1

The problem in your code is that you are always creating new instances of GetTileType .

In LoadContent you create one instance - let's call it A - and set the Dirt property on that instance.
But you don't save that instance anywhere, after the method finished, A is out of scope and will eventually be garbage collected.

In Update you create a new instance - B - and retrieve the value of the Dirt property from it.
Because this is a newly created instance, this is null .