C# XNA 鼠标位置

我在 XNA 中的鼠标坐标遇到一些问题 - 0x0 任意靠近（但不在）屏幕的左上角。

我现在正在窗口模式下运行游戏，但坐标是基于屏幕的，而不是游戏窗口的（尽管 XNA 文档告诉我应该是其他情况）

提前致谢！

这是代码：

namespace TheGame
{
   class Mousey
   {
      static public Vector2 pos;
      static private Texture2D tex;
      static public MouseState mouseState;
      static public MouseState previousState;

      //static public Mousey()
      //{
      //}

      static public void Update()
      {
         previousState = mouseState;
         mouseState = Mouse.GetState(); //Needed to find the most current mouse states.
         pos.X = mouseState.X; //Change x pos to mouseX
         pos.Y = mouseState.Y; //Change y pos to mouseY
      }

      //Drawing function to be called in the main Draw function.
      static public void LoadContent(ContentManager thecontent)
      {
         tex = thecontent.Load<Texture2D>("mousey");
      }

      static public void Draw(SpriteBatch batch) //SpriteBatch to use.
      {
         batch.Draw(tex, pos, Color.White); //Draw it using the batch.
      }

      static public bool LBP()
      {
          if (mouseState.LeftButton == ButtonState.Pressed && previousState.LeftButton ==                      ButtonState.Released)
          {
              return true; 
          }
          else 
          { 
              return false; 
          }
      }   
   }
}

在游戏.cs中：

//sets the windows mouse handle to client bounds handle

Mouse.WindowHandle = Window.Handle;