如何在XNA中更改背景颜色

Question

This code is in the update method, and I think that just means that this is what happens when the screen updates, but I'm not sure.I am wonder specifically about the lines of code 6-10. I am trying to make it so when the mouse is on the screen the screen turn green.

protected override void Update(GameTime gameTime)
{

    if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
        this.Exit();
    MouseState current_mouse = Mouse.GetState();
    int mousep1 = current_mouse.X;
    int mousep2 = current_mouse.Y;
    if (current_mouse.X >= 0)
    {
        backcolor = Color.Green;
    }
    base.Update(gameTime);
}

Answer 1

You must change the Draw method to use the variable when clearing the screen.

Make sure the backcolor variable is declared as a class level variable of type Microsoft.XNA.Framework.Color

protected override void Draw(GameTime gameTime)
{           
    GraphicsDevice.Clear(backcolor);

    // Add Draw code here

    base.Draw(gameTime);
}