Unity 处理IOC AOP

时间:2021-02-23 23:46:51

用Unity 可以做IOC(控制反转) AOP(切面)可以做统一的异常和日志处理,非常方便,项目中是用微软企业库中的Microsoft.Practices.Unity实现

1 定义接口与实现

    //定义接口
public interface IProductService
{
string GetProduct();
} //实现接口
public class ProductService:IProductService
{
public string GetProduct()
{
int i = ;
int j = ;
//抛异常
return (j / i).ToString();
}
}

2 实现依赖反转

 public sealed class ServiceLocator : IServiceProvider
{
#region Private Fields
private readonly IUnityContainer container;
#endregion #region Private Static Fields
private static readonly ServiceLocator instance = new ServiceLocator();
#endregion #region Ctor
/// <summary>
/// Initializes a new instance of <c>ServiceLocator</c> class.
/// </summary>
private ServiceLocator()
{
UnityConfigurationSection section = (UnityConfigurationSection)ConfigurationManager.GetSection("unity");
container = new UnityContainer();
section.Configure(container);
}
#endregion #region Public Static Properties
/// <summary>
/// Gets the singleton instance of the <c>ServiceLocator</c> class.
/// </summary>
public static ServiceLocator Instance
{
get { return instance; }
}
#endregion #region Private Methods
private IEnumerable<ParameterOverride> GetParameterOverrides(object overridedArguments)
{
List<ParameterOverride> overrides = new List<ParameterOverride>();
Type argumentsType = overridedArguments.GetType();
argumentsType.GetProperties(BindingFlags.Public | BindingFlags.Instance)
.ToList()
.ForEach(property =>
{
var propertyValue = property.GetValue(overridedArguments, null);
var propertyName = property.Name;
overrides.Add(new ParameterOverride(propertyName, propertyValue));
});
return overrides;
}
#endregion #region Public Methods
/// <summary>
/// Gets the service instance with the given type.
/// </summary>
/// <typeparam name="T">The type of the service.</typeparam>
/// <returns>The service instance.</returns>
public T GetService<T>()
{
return container.Resolve<T>();
}
/// <summary>
/// Gets the service instance with the given type by using the overrided arguments.
/// </summary>
/// <typeparam name="T">The type of the service.</typeparam>
/// <param name="overridedArguments">The overrided arguments.</param>
/// <returns>The service instance.</returns>
public T GetService<T>(object overridedArguments)
{
var overrides = GetParameterOverrides(overridedArguments);
return container.Resolve<T>(overrides.ToArray());
}
/// <summary>
/// Gets the service instance with the given type by using the overrided arguments.
/// </summary>
/// <param name="serviceType">The type of the service.</param>
/// <param name="overridedArguments">The overrided arguments.</param>
/// <returns>The service instance.</returns>
public object GetService(Type serviceType, object overridedArguments)
{
var overrides = GetParameterOverrides(overridedArguments);
return container.Resolve(serviceType, overrides.ToArray());
}
#endregion #region IServiceProvider Members
/// <summary>
/// Gets the service instance with the given type.
/// </summary>
/// <param name="serviceType">The type of the service.</param>
/// <returns>The service instance.</returns>
public object GetService(Type serviceType)
{
return container.Resolve(serviceType);
} #endregion
}

3 异常拦截类

public class ExceptionLoggingBehavior: IInterceptionBehavior
{
public IEnumerable<Type> GetRequiredInterfaces()
{
return Type.EmptyTypes;
} public IMethodReturn Invoke(IMethodInvocation input, GetNextInterceptionBehaviorDelegate getNext)
{
var methodReturn = getNext().Invoke(input, getNext);
if (methodReturn.Exception != null)
{
Console.WriteLine("拦截到异常 " + methodReturn.Exception.Message);
} return methodReturn;
} public bool WillExecute
{
get { return true; }
} }

4 App.config 配置

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection, Microsoft.Practices.Unity.Configuration"/>
</configSections>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
</startup>
<!--BEGIN: Unity-->
<unity xmlns="http://schemas.microsoft.com/practices/2010/unity">
<sectionExtension type="Microsoft.Practices.Unity.InterceptionExtension.Configuration.InterceptionConfigurationExtension, Microsoft.Practices.Unity.Interception.Configuration"/>
<container>
<extension type="Interception"/>
<!--Cache Provider-->
<register type="UnityAOP.IProductService, UnityAOP" mapTo="UnityAOP.ProductService, UnityAOP">
<interceptor type="InterfaceInterceptor"/>
<!--<interceptionBehavior type="UnityAOP.CachingBehavior, UnityAOP"/>-->
<interceptionBehavior type="UnityAOP.ExceptionLoggingBehavior, UnityAOP"/>
</register>
</container>
</unity>
<!--END: Unity-->
</configuration>

5 调用

static void Main(string[] args)
{
IProductService service = ServiceLocator.Instance.GetService<IProductService>();
try
{
service.GetProduct();
}
catch (Exception ex)
{ } Console.Read();
}

Unity 处理IOC AOP

简单的例子

代码:http://files.cnblogs.com/files/zery/UnityAOP.rar

如果在使用时提示如下错误:

创建 unity 的配置节处理程序时出错: The type name or alias Microsoft.Practices.Unity.InterceptionExtension.Configuration.InterceptionConfigurationExtension, Microsoft.Practices.Unity.Interception.Configuration could not be resolved. Please check your configuration file and verify this type name. (d:\我的文档\visual studio 2015\Projects\KMML.Web\KMML.Web\web.config line 16)

请在Nuget中安装 Unity.Interceptio即可解决