C#二进制读写BinaryReader、BinaryWriter、BinaryFormatter

using (BinaryWriter writer = new BinaryWriter(File.Open(fileName, FileMode.Create)))
{
    writer.Write(1.250F);
    writer.Write(@"c:\Temp");
    writer.Write(10);
    writer.Write(true);
}

FileStream fs = new FileStream(Server.MapPath("未命名.jpg"), FileMode.Open);//将图片文件存在文件流中
long fslength = fs.Length;//流长度
byte[] b=new byte[(int)fslength];//定义二进制数组
fs.Read(b, 0, (int)fslength);//将流中字节写入二进制数组中
fs.Close();//关闭流
Response.ContentType = "image/jpg";//没有这个会出现乱码
Response.BinaryWrite(b);//将图片输出在页面

const string fileName = "AppSettings.dat";
float aspectRatio;
string tempDirectory;
int autoSaveTime;
bool showStatusBar;

if (File.Exists(fileName))
{
    using (BinaryReader reader = new BinaryReader(File.Open(fileName, FileMode.Open)))
    {
        aspectRatio = reader.ReadSingle();
        tempDirectory = reader.ReadString();
        autoSaveTime = reader.ReadInt32();
        showStatusBar = reader.ReadBoolean();
    }

    Console.WriteLine("Aspect ratio set to: " + aspectRatio);
    Console.WriteLine("Temp directory is: " + tempDirectory);
    Console.WriteLine("Auto save time set to: " + autoSaveTime);
    Console.WriteLine("Show status bar: " + showStatusBar);
}

using (FileStream fs = new FileStream("1.jpg", FileMode.Open, FileAccess.Read))
{
    //将图片以文件流的形式进行保存
    using (BinaryReader br = new BinaryReader(fs))
    {
        byte[] imgBytesIn = br.ReadBytes((int)fs.Length); //将流读入到字节数组中
        br.Close();
    }
}

[Serializable]
public class Product //实体类
{
    public long Id;
    [NonSerialized]//标识不序列化此成员Name
    public string Name;
    public Product(long Id, string Name)
    {
        this.Id = Id;
        this.Name = Name;
    }
}

static void Main()
{
    //序列化（对象保存到文件）
    List<Product> Products = new List<Product> {
        new Product(1,"a"),new Product(2,"b")
    };

    FileStream fs = new FileStream("DataFile.dat", FileMode.Create);
    IFormatter formatter = new BinaryFormatter();
    formatter.Serialize(fs, Products);
    fs.Close();

    //反序列化（文件内容转成对象）
    FileStream fs1 = new FileStream("DataFile.dat", FileMode.Open);
    BinaryFormatter formatter1 = new BinaryFormatter();
    List<Product> addresses = (List<Product>)formatter1.Deserialize(fs1);
    fs1.Close();
    foreach (Product de in addresses)
    {
        Console.WriteLine("{0} lives at {1}.", de.Id, de.Name);
    }
}