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我的 xna 游戏有这个“流氓” System.InvalidOperationException，它有时只会发生并且似乎是随机触发的，或者至少是我无法控制的输入。按下开始并加载第一个菜单屏幕后，（如果有帮助，我使用 GameStateManagement 示例作为我的游戏的基础）游戏有时但并不总是在“foreach”的“in”部分抛出 System.InvalidOperationException（GameScreen 屏幕在屏幕中）”方法的完整代码：

            /// <summary>
    /// Tells each screen to draw itself.
    /// </summary>
    public override void Draw(GameTime gameTime)
    {

        foreach (GameScreen screen in screens) //exception thrown at the "in" part
        {
            if (screen.ScreenState == ScreenState.Hidden)
                continue;

            screen.Draw(gameTime);
        }
    }

老实说，我对触发此异常的原因一无所知，因为我没有做任何与抛出异常和不抛出异常不同的事情。我不确定这是否会对您有所帮助，但这是异常详细信息

   at System.Collections.Generic.List`1.Enumerator.MoveNext()
   at GameStateManagement.ScreenManager.Draw(GameTime gameTime)
   at Microsoft.Xna.Framework.Game.Draw(GameTime gameTime)
   at GameStateManagement.GameStateManagementGame.Draw(GameTime gameTime)
   at Microsoft.Xna.Framework.Game.DrawFrame()
   at Microsoft.Xna.Framework.Game.Tick()
   at Microsoft.Xna.Framework.Game.HostIdle(Object sender, EventArgs e)
   at Microsoft.Xna.Framework.GameHost.OnIdle()
   at Microsoft.Xna.Framework.XboxGameHost.RunOneFrame()
   at Microsoft.Xna.Framework.XboxGameHost.Run()
   at Microsoft.Xna.Framework.Game.RunGame(Boolean useBlockingRun)
   at Microsoft.Xna.Framework.Game.Run()
   at GameStateManagement.Program.Main()
}   System.Exception {System.InvalidOperationException}

这是调用堆栈：

>   GameStateManagementSample.exe!GameStateManagement.ScreenManager.Draw(Microsoft.Xna.Framework.GameTime gameTime) Line 338 + 0x33 bytes   C#
Microsoft.Xna.Framework.Game.dll!Microsoft.Xna.Framework.Game.Draw(Microsoft.Xna.Framework.GameTime gameTime) + 0x4d bytes  
GameStateManagementSample.exe!GameStateManagement.GameStateManagementGame.Draw(Microsoft.Xna.Framework.GameTime gameTime) Line 89 + 0x7 bytes   C#
Microsoft.Xna.Framework.Game.dll!Microsoft.Xna.Framework.Game.DrawFrame() + 0x6a bytes  
Microsoft.Xna.Framework.Game.dll!Microsoft.Xna.Framework.Game.Tick() + 0x2a9 bytes  
Microsoft.Xna.Framework.Game.dll!Microsoft.Xna.Framework.Game.HostIdle(object sender, System.EventArgs e) + 0x6 bytes   
Microsoft.Xna.Framework.Game.dll!Microsoft.Xna.Framework.GameHost.OnIdle() + 0x19 bytes 
Microsoft.Xna.Framework.Game.dll!Microsoft.Xna.Framework.XboxGameHost.RunOneFrame() + 0xc bytes 
Microsoft.Xna.Framework.Game.dll!Microsoft.Xna.Framework.XboxGameHost.Run() + 0x1b bytes    
Microsoft.Xna.Framework.Game.dll!Microsoft.Xna.Framework.Game.RunGame(bool useBlockingRun) + 0x9c bytes 
Microsoft.Xna.Framework.Game.dll!Microsoft.Xna.Framework.Game.Run() + 0x7 bytes 
GameStateManagementSample.exe!GameStateManagement.Program.Main() Line 108 + 0x6 bytes   C#

谢谢！伊瓦特里克斯。

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1 回答 1

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看起来您的游戏代码正在修改screens一些您没有考虑过的代码路径。查看有关IEnumerator.MoveNext的文档。

在创建枚举器后修改了集合。

于 2012-12-19T06:08:49.997 回答