Unity Container 应用示例
Unity Container 应用示例一 项目引用Unity右键项目引用-> 管理Nuget包->搜索unity->安装Unity 和 Unity Interception Extension,如下图所示.
二 创建基础类我们以商品查询的数据层注入为例.
1.首先创建商品实体Model. 如果商品信息要被序列化,就要为该类添加Serializable特性.
public class PRoduct { public int Id { get; set; } public string Name { get; set; } public int Price { get; set; } public override string ToString() { return string.Format(" Product id:{0}\r\n Name:{1}\r\n Price:{2}\r\n",Id,Name,Price); } }
2.创建数据层接口及其实现类.
public interface iproductDao { Product Get(int id); }
public class ProductDao:IProductDao { public Product Get(int id) { #warning product info for test return new Product() { Id = id, Name = "Product"+id, Price = id*10 }; } }
3.直接创建实例
其实有了以上内容就可以调用查询商品信息了.
static void Main( string[] args) { IProductDao productDao= new ProductDao(); Product product = productDao.Get(5); Console.WriteLine(product.ToString()); Console.Read(); }
不过在项目中使用这种方式的话,耦合度比较高.一旦想修改IProductDao的实现方式涉及到的地方就太多了. 使用Unity实现依赖注入可以降低耦合.
三.使用Unity实现依赖注入 1.创建Unity配置文件
<? xml version= "1.0 "?> < configuration> < configSections> <!-- unity程序集--> < section name= "unity " type =" Microsoft.Practices.Unity.Configuration.UnityConfigurationSection, Microsoft.Practices.Unity.Configuration" /> </ configSections> < unity xmlns= "http://schemas.microsoft.com/practices/2010/unity "> <!-- 程序集和命名空间 --> < assembly name= "DemoCache "/> < namespace name= "DemoCache.Dao "/> < namespace name= "DemoCache.Dao.Impl "/> < container name= "Dao "> <!-- 商品 --> < register type= "IProductDao " mapTo= "ProductDao "></ register> </ container> </ unity> </ configuration>
2.创建UnityContainerManager类
创建UnityContainerManager读取Unity.config配置. 完整代码见附件,重点看一下从Unity.config读取配置信息的方法:
private IUnityContainer LoadUnityConfig() { ////根据文件名获取指定config文件 string filePath = AppDomain.CurrentDomain.BaseDirectory + @"Configs\Unity.config"; var fileMap = new ExeConfigurationFileMap { ExeConfigFilename = filePath }; //从config文件中读取配置信息 Configuration configuration = ConfigurationManager.OpenMappedExeConfiguration(fileMap, ConfigurationUserLevel.None); var unitySection = (UnityConfigurationSection)configuration.GetSection("unity"); var container = new UnityContainer(); foreach (var item in unitySection.Containers) { container.LoadConfiguration(unitySection, item.Name); } return container; }
3.调用示例
static void Main( string[] args) { IProductDao productDao = UnityContainerManager .Instance.Resolve<IProductDao >(); Product product = productDao.Get(8); Console.WriteLine(product.ToString()); Console.Read(); }
四 使用Unity Interception实现日志 1.创建ICallHandler接口实现类
新建类LogCallHandler类,实现接口ICallHandler. 每次调用相应方法时会自动将执行时间写入日志.
public class LogCallHandler:ICallHandler { public IMethodReturn Invoke(IMethodInvocation input, GetNextHandlerDelegate getNext) { //计时开始 var stopWatch = new Stopwatch(); stopWatch.Start(); //执行方法 IMethodReturn result = getNext()(input, getNext); //计时结束 stopWatch.Stop(); //记录日志 var argumentsSb = new StringBuilder(input.MethodBase.Name); for (var i = 0; i < input.Arguments.Count; i++) { argumentsSb.AppendFormat("-{0}:{1}", input.Arguments.ParameterName(i), input.Arguments[i]); } LogHelper.LogInfo(string.Format("{2} 方法 {0},执行时间 {1} ms", argumentsSb, stopWatch.ElapsedMilliseconds,Msg)); return result; } public int Order { get; set; } public string Msg { get; set; } }
2.创建特性
创建特性LogTime,它需要实现HandlerAttribute.
public class LogTimeAttributes:HandlerAttribute { public int Order { get; set; } public string Msg { get; set; } public override ICallHandler CreateHandler(IUnityContainer container) { return new LogCallHandler() { Order = Order, Msg = Msg }; } }
3.使用特性
[LogTimeAttributes (Order = 1,Msg = "查询单个商品信息" )]
4.配置Unity.config
配置Unity Interception需要在unity节点下添加:
< sectionExtension
type =" Microsoft.Practices.Unity.InterceptionExtension.Configuration.InterceptionConfigurationExtension,Microsoft.Practices.Unity.Interception.Configuration ">
</ sectionExtension >
然后在container节点下添加:
< extension type= "Interception " />
最后调整IProductDao的注册节点:
< register type= "IProductDao " mapTo= "ProductDao "> < interceptor type =" InterfaceInterceptor" /> < policyInjection /> </ register>
调用处不用做调整,结果如下:
5.不使用Unity.config配置文件
其实如果不走Unity.config配置文件,也可以直接在代码中设置.
static void Main(string[] args) { var container = new UnityContainer().AddNewExtension<Interception>().RegisterType<IProductDao, ProductDao>(); container.Configure<Interception>().SetInterceptorFor<IProductDao>(new InterfaceInterceptor()); IProductDao productDao = container.Resolve<IProductDao>(); Product product = productDao.Get(8); Console.WriteLine(product); Console.Read(); }
代码: http://files.cnblogs.com/files/janes/DemoCache.zip
