Сохранение и загрузка во время игры XNA включает в себя ряд асинхронных вызовов методов. Вы найдете объекты, которые вам нужны, в пространстве имен Microsoft.Xna.Framework.Storage.
В частности, вам необходимо StorageDevice и StorageContainer;
private static StorageDevice mStorageDevice;
private static StorageContainer mStorageContainer;
Спасти:
public static void SaveGame()
{
// Call this static method to begin the process; SaveGameDevice is another method in your class
StorageDevice.BeginShowSelector(SaveGameDevice, null);
}
// this will be called by XNA sometime after your call to BeginShowSelector
// SaveGameContainer is another method in your class
private static void SaveGameDevice(IAsyncResult pAsyncResult)
{
mStorageDevice = StorageDevice.EndShowSelector(pAsyncResult);
mStorageDevice.BeginOpenContainer("Save1", SaveGameContainer, null);
}
// this method does the actual saving
private static void SaveGameContainer(IAsyncResult pAsyncResult)
{
mStorageContainer = mStorageDevice.EndOpenContainer(pAsyncResult);
if (mStorageContainer.FileExists("save.dat"))
mStorageContainer.DeleteFile("save.dat");
// in my case, I have a BinaryWriter wrapper that I use to perform the save
BinaryWriter writer = new BinaryWriter(new System.IO.BinaryWriter(mStorageContainer.CreateFile("save.dat")));
// I save the gamestate by passing the BinaryWriter
GameProgram.GameState.SaveBinary(writer);
// then I close the writer
writer.Close();
// clean up
mStorageContainer.Dispose();
mStorageContainer = null;
}
Загрузка очень похожи:
public static void LoadGame()
{
StorageDevice.BeginShowSelector(LoadGameDevice, null);
}
private static void LoadGameDevice(IAsyncResult pAsyncResult)
{
mStorageDevice = StorageDevice.EndShowSelector(pAsyncResult);
mStorageDevice.BeginOpenContainer("Save1", LoadGameContainer, null);
}
private static void LoadGameContainer(IAsyncResult pAsyncResult)
{
mStorageContainer = mStorageDevice.EndOpenContainer(pAsyncResult))
// this is my wrapper of BinaryReader which I use to perform the load
BinaryReader reader = null;
// the file may not exist
if (mStorageContainer.FileExists("save.dat"))
{
reader = new BinaryReader(new System.IO.BinaryReader(mStorageContainer.OpenFile("save.dat", FileMode.Open)));
// pass the BinaryReader to read the data
GameProgram.LoadGameState(reader);
reader.Close();
}
// clean up
mStorageContainer.Dispose();
mStorageContainer = null;
}