如何更改其他类中的变量？

Question

I'm trying to change the variable GameWeek from a method in a different class, but I can't get it to work.

In my Game1 constructor I create the class

public GameData currentGameData = new GameData();

The class I'm trying to change the GameWeek variable is created in the Game1 Load method:

startScreen = new StartScreen(this, globalVariables, currentGameData);

In the StartScreen class I have the following (constructor + next one or two lines):

GameData thisGameData

public StartScreen(Game1 game, GlobalVariables globalVariables, GameData gameData)
      : base(game)
{
  this.thisGameData = gameData;

I then modify thisGameData in a method in the startScreen class:

thisGameData.GameWeek = 1;  //this doesn't work

However, currentGameData in the Game1 class hasn't changed. This hardly seems surprising, my question is how to I go about actually doing this? As I understand it, when you pass a class in a constructor only the reference is passed, so even though the reference name is difference shouldn't it point to the same place (as they were set to be the same).

I feel like I've completely lost the plot / got something a bit backward here, but I can't figure this one out.

Any help much appreciated!

GameData class for reference:

public int gameWeek;
public int GameWeek
{
  get { return gameWeek; }
  set
  {
    if (gameWeek > 52)
    {
      gameWeek = 0;
      gameYear += 1;
    }
    else
    {
      gameWeek = value;
    }
  }
}

public int gameYear;

EDIT

To reclarify the question as I don't feel like I've phrased it very well.

If in my Game1 class I write:

currentGameData.gameWeek = 1;

Then it works.

What I want to achieve is exactly the same as that, but do it from the within the StartScreen class.

If I just write the above in my StartScreen class then it obviously doesn't work because currentGameData doesn't exist.

Answer 1

Sorry, prior post was entered too quickly.

public int GameWeek
{
  get { return gameWeek; }
  set
  {
    if (value > 52) // value here was gameWeek.
    {
      gameWeek = 0;
      gameYear += 1;
    }
    else
    {
      gameWeek = value;
    }
  }
}

Do you also need to do something in your calling code to determine if the week is greater than 52? Eg, your code will work in the GameWeek property if value is 53, but if it hits 54, the week would still be 0 and the year would increase by one, again.

EDIT: responding to poster's intended issue of not being able to set a value and have it reflect

I haven't worked a whole lot with C#, but it seems like you need a reference parameter to do what you are asking for, though it seems like a bad idea to do it that way.

startScreen = new StartScreen(this, globalVariables, ref currentGameData);


public StartScreen(Game1 game, GlobalVariables globalVariables, ref GameData gameData)
      : base(game)
{
  this.thisGameData = gameData;
  this.thisGameData.GameWeek = 1;
  // ...
}

BTW, you should put better snippets of code in for us, such as giving us the entire wrapper, like so:

// GameData class for reference:
class GameData {
  public int gameWeek;
  public int GameWeek
  {
    get { return gameWeek; }
    set
    {
      if (gameWeek > 52)
      {
        gameWeek = 0;
        gameYear += 1;
      }
      else
      {
        gameWeek = value;
      }
    }
  }

  public int gameYear;
} // end class GameData

That takes a lot less explaining =)

Answer 2

将其声明为public static int gameweek；