Create First Xna Application for Windows Phone 7

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　　1. Hello Xna for Windows Phone 7
　　2. xna中代码执行流程
　　3. 代码下载
　　
　　1. Hello Xna for Windows Phone 7
　　1.1 新建 xna工程。


　　vs将会生成下面的工程。

　　其中XnaHelloPhoneContent工程中包含了项目中需要使用资源文件（bitmap file，effect file，sprite file），XnaHelloPhone工程中包含了对XnaHelloPhoneContent项目的引用，在代码就可直接使用这些资源，例如如果想要加载字体资源，代码如下：
　　font = this.Content.Load("SpriteFont1");
　　这里的Load方法中的参数是该字体的asset name。


　　1.2 修改代码。
　　Game1.cs：


using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.GamerServices;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Input.Touch;
using Microsoft.Xna.Framework.Media;
namespace XnaHelloPhone
{
    ///
    /// This is the main type for your game
    ///
    public class Game1 : Microsoft.Xna.Framework.Game
    {
        GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;
        // 显示的文字
        private string text = "Hello Window Phone 7!";
        // 文字字体
        private SpriteFont font;
        // 文字位置
        private Vector2 textPosition;
        public Game1()
        {
            graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";
            
            // Frame rate is 30 fps by default for Windows Phone.
            TargetElapsedTime = TimeSpan.FromTicks(333333);
        }
        ///
        /// Allows the game to perform any initialization it needs to before starting to run.
        /// This is where it can query for any required services and load any non-graphic
        /// related content.  Calling base.Initialize will enumerate through any components
        /// and initialize them as well.
        ///
        protected override void Initialize()
        {
            // TODO: Add your initialization logic here

            base.Initialize();
        }
        ///
        /// LoadContent will be called once per game and is the place to load
        /// all of your content.
        ///
        protected override void LoadContent()
        {
            // Create a new SpriteBatch, which can be used to draw textures.
            spriteBatch = new SpriteBatch(GraphicsDevice);
            font = this.Content.Load("SpriteFont1");
            Vector2 textSize = font.MeasureString(text);
            Viewport viewpoint = this.GraphicsDevice.Viewport;
            this.textPosition = new Vector2( (viewpoint.Width - textSize.X) / 2,
               (viewpoint.Height - textSize.Y) / 2 );
            // TODO: use this.Content to load your game content here
        }
        ///
        /// UnloadContent will be called once per game and is the place to unload
        /// all content.
        ///
        protected override void UnloadContent()
        {
            // TODO: Unload any non ContentManager content here
           
        }
        ///
        /// Allows the game to run logic such as updating the world,
        /// checking for collisions, gathering input, and playing audio.
        ///
        /// Provides a snapshot of timing values.
        protected override void Update(GameTime gameTime)
        {
            // Allows the game to exit
            if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
                this.Exit();
            // TODO: Add your update logic here

            base.Update(gameTime);
        }
        ///
        /// This is called when the game should draw itself.
        ///
        /// Provides a snapshot of timing values.
        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(Color.Navy);
            // TODO: Add your drawing code here
            spriteBatch.Begin();
            spriteBatch.DrawString(font, this.text,
                textPosition,
                Color.White);
            spriteBatch.End();
            base.Draw(gameTime);
        }
    }
　　}
　　1.3 运行程序

　　
　　2. xna中代码执行流程

　　3. 代码下载
　　/Files/xuqiang/XnaHelloPhone.rar