SpriteBatch.end() Issue because of a thread

Question

While playing, I use a thread to Load() and Unload() Texture2D. I have multiple ContentManager to only Unload() Texture2D I want to unload.

But sometimes, I have this issue on the SpriteBatch.End() :

    ObjectDisposedException: Cannot access a disposed object
    Object name : texture2D

I don't understand very well the Threads, and I think it's the main problem. Roughly :

    Game.Update(GameTime gameTime)
    {
        character.Update(gameTime);
        //...Things.Update(gameTime)...
        CheckThingsToLoadandUnload();
    //etc
    }

    CheckThingsToLoadAndUnload()
    {
        For each texture to check
        {
            if(HasPrerequists)
            {
                if(!thisTexture.isLoaded)
                {
                    ThreadStart ths_LoadInGame = delegate {
                        LoadInGame(param1, param2, param3); };
                    new Thread(ths_LoadInGame).Start();
                }
            }
            else
            {
                if(thisTexture.isLoaded)
                {
                    ThreadStart ths_UnloadInGame = delegate {
                        UnloadInGame (param1, param2); };
                    new Thread(ths_UnloadInGame ).Start();
                }
            }
        }
    }

I overrided the T Load<T<(string assetname) ContentManager to add a Lock.

I think this issue happens when the Unload() Thread unload a Texture used by the SpriteBatch(). But I really don't know how to prevent this. Hope you can help.

Answer 1

With the participation of "dadoo Games", here is my answer.

Thread :

Unload()
{
   if(canUnload) { UnloadTextures() }
}

DrawMethod :

Draw(GameTime gameTime)
{
    canUnload = false;
    DrawScenes();
    base.Draw(GameTime);
    canUload = true;