asp.net使用StructureMap等依赖注入组件时最重要就是EntityFramework的DbContext对象要保证在每次HttPRequest只有一个DbContext实例，这里将使用第三方提供的HttpSimulator进行测试。
1.定义IDependency接口创建屏蔽不同依赖注入组件使用差别的接口。
publicinterfaceIDependency
{voidBuild();voidEndRequest();voidAddTransient(Typefrom, Type to,objectinstance =null);voidAddScoped(Typefrom, Type to,objectinstance =null);voidAddSingleton(Typefrom, Type to,objectinstance =null);objectGetInstance(Type type);
IEnumerable GetAllInstances(Type type);
}
2.提供StructureMap的适配类StructureMapAdapterpublicclassStructureMapAdapter : IDependency, IDisposable
{privatebool_disposed =false;privateContainer _container;privateRegistry _registry;publicStructureMapAdapter()
{this._registry =newRegistry();
}publicvoidBuild()
{
_container=newContainer(_registry);
}publicvoidEndRequest()
{
HttpContextLifecycle.DisposeAndClearAll();
}publicvoidAddTransient(Typefrom, Type to,objectinstance =null)
{if(instance ==null)
{
_registry.For(from).Use(to).LifecycleIs<TransientLifecycle>();
}else{
_registry.For(from).Use(instance).LifecycleIs<TransientLifecycle>();
}
}publicvoidAddScoped(Typefrom, Type to,objectinstance =null)
{if(instance ==null)
{
_registry.For(from).Use(to).LifecycleIs<HttpContextLifecycle>();
}else{
_registry.For(from).Use(instance).LifecycleIs<HttpContextLifecycle>();
}
}publicvoidAddSingleton(Typefrom, Type to,objectinstance =null)
{if(instance ==null)
{
_registry.For(from).Use(to).LifecycleIs<SingletonLifecycle>();
}else{
_registry.For(from).Use(instance).LifecycleIs<SingletonLifecycle>();
}
}publicobjectGetInstance(Type type)
{return_container.GetInstance(type);
}publicIEnumerable GetAllInstances(Type type)
{return_container.GetAllInstances(type);
}publicvoidDispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}protectedvirtualvoidDispose(booldisposing)
{if(!_disposed)
{if(disposing)
{this._container.Dispose();
}
_disposed=true;
}
}
}
3.使用HttpSimulator进行单元测试publicclassStructureMapAdapterTest
{
[Fact]publicvoidTransientTest()
{
IDependency dependency=newStructureMapAdapter();
dependency.AddTransient(typeof(ITest),typeof(Test));
dependency.Build();varversion1 = ((ITest)dependency.GetInstance(typeof(ITest))).Version;varversion2 = ((ITest)dependency.GetInstance(typeof(ITest))).Version;
Assert.NotEqual(version1, version2);
}
[Fact]publicvoidSingletonTest()
{
IDependency dependency=newStructureMapAdapter();
dependency.AddSingleton(typeof(ITest),typeof(Test));
dependency.Build();varversion1 = ((ITest)dependency.GetInstance(typeof(ITest))).Version;varversion2 = ((ITest)dependency.GetInstance(typeof(ITest))).Version;
Assert.Equal(version1, version2);
}
[Fact]publicvoidScopedTest()
{varversion1 ="";varversion2 ="";using(HttpSimulator simulator =newHttpSimulator())
{
IDependency dependency=newStructureMapAdapter();
dependency.AddScoped(typeof(ITest),typeof(Test));
dependency.Build();
simulator.SimulateRequest(newUri("http://localhost/"));
version1= ((ITest)dependency.GetInstance(typeof(ITest))).Version;
version2= ((ITest)dependency.GetInstance(typeof(ITest))).Version;
Assert.Equal(version1, version2);
}using(HttpSimulator simulator =newHttpSimulator())
{
IDependency dependency=newStructureMapAdapter();
dependency.AddScoped(typeof(ITest),typeof(Test));
dependency.Build();
simulator.SimulateRequest(newUri("http://localhost/"));
version1= ((ITest)dependency.GetInstance(typeof(ITest))).Version;
}using(HttpSimulator simulator =newHttpSimulator())
{
IDependency dependency=newStructureMapAdapter();
dependency.AddScoped(typeof(ITest),typeof(Test));
dependency.Build();
simulator.SimulateRequest(newUri("http://localhost/"));
version2= ((ITest)dependency.GetInstance(typeof(ITest))).Version;
}
Assert.NotEqual(version1, version2);
}
}publicinterfaceITest
{
String Version {get; }
}publicclassTest : ITest
{privatestring_version =Guid.NewGuid().ToString();publicstringVersion {get{returnthis._version; } }
}
运行结果:
[flash=500,400]http://s1.knowsky.com/20160211/x1nbcdqvtam15.png[/flash]