XNA试验篇（二）

接着《XNA准备篇（一）》的程序开工。

首先，我们先将任意一张图片拷贝到当前项目的：“bing\x86\Debug”目录，然后再开始我们的程序，如（注意“新增”的地方）：

using System;
using System.Collections.Generic;
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.Media;
using Microsoft.Xna.Framework.Net;
using Microsoft.Xna.Framework.Storage;

namespace MyFirstGame
{
    /// <summary>
    /// This is the main type for your game
    /// </summary>
    public class Game1 : Microsoft.Xna.Framework.Game
    {
        GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;

        /// <summary>
        /// 定义一个Texture2D的对像（新增）
        /// </summary>
        Texture2D texture;

        public Game1()
        {
            graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";
        }

        /// <summary>
        /// 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.
        /// </summary>
        protected override void Initialize()
        {
            // TODO: Add your initialization logic here

            base.Initialize();
        }

        /// <summary>
        /// LoadContent will be called once per game and is the place to load
        /// all of your content.
        /// </summary>
        protected override void LoadContent()
        {
            // Create a new SpriteBatch, which can be used to draw textures.
            spriteBatch = new SpriteBatch(GraphicsDevice);

            //新增
            //等控件初始化完成后，graphics.GraphicsDevic就不会为NULL了
            //将test.jpg的图片以2D的方式画到当前的graphics.GraphicsDevice
            texture = Texture2D.FromFile(graphics.GraphicsDevice, "test.jpg");

            // TODO: use this.Content to load your game content here
        }

        /// <summary>
        /// UnloadContent will be called once per game and is the place to unload
        /// all content.
        /// </summary>
        protected override void UnloadContent()
        {
            // TODO: Unload any non ContentManager content here
        }

        /// <summary>
        /// Allows the game to run logic such as updating the world,
        /// checking for collisions, gathering input, and playing audio.
        /// </summary>
        /// <param name="gameTime">Provides a snapshot of timing values.</param>
        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);
        }

        /// <summary>
        /// This is called when the game should draw itself.
        /// </summary>
        /// <param name="gameTime">Provides a snapshot of timing values.</param>
        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(Color.CornflowerBlue);

            // TODO: Add your drawing code here
            //新增
            //绘画驱动开始
            spriteBatch.Begin();
            //将texture加载的图片画到所属的GraphicsDevice上，并定义图片所在的2维坐标，以及图片的着色颜色。
            spriteBatch.Draw(texture, new Vector2(0.0f, 0.0f), Color.Red);
            //结束GraphicsDevice绘画
            spriteBatch.End();

            base.Draw(gameTime);
        }
    }
}

 按F5运行的时候，是不是将你的那张图片加载到游戏的窗体里了呢。