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Web API 源码剖析之默认配置(HttpConfiguration)
我们在上一节讲述了全局配置和初始化。本节我们将就全局配置的Configuration只读属性进行展开,她是一个类型为HttpConfiguration。 它在Web Api 主要为整个API 做一些最基础的工作,比如定义默认
- 路由表(Routes)
- 过滤器(Filters)
- 默认消息处理程序(MessageHandlers)
- 属性字典(Properties)
- 依赖注入解耦器(DependencyResolver)
- 错误处理策略(IncludeErrorDetailPolicy)
- 服务(Services,这里的服务是之为Web ApI 框架的服务对应的接口和实现)
- 媒体格式程序(Formatters)
- 参数绑定规则(ParameterBindingRules)。
以上 就是配置的属性。 接下来将就部分属性展开。
Formatters
默认格式化程序,是一个MediaTypeFormatterCollection类型。
API 里定义4个默认格式:
- JsonMediaTypeFormatter:对应的是用来处理请求头是application/json或text/json格式,
- XmlMediaTypeFormatter:对应的是用来处理请求头是application/xml格式
- FormUrlEncodedMediaTypeFormatter:对应的是用来处理请求头是application/x-www-form-urlencoded,
- JQueryMvcFormUrlEncodedFormatter
Services
默认服务定义如下:
public DefaultServices(HttpConfiguration configuration)
{
if (configuration == null)
{
throw Error.ArgumentNull("configuration");
}_configuration = configuration;
// Initialize the dictionary with all known service types, even if the list for that service type is
// empty, because we will throw if the developer tries to read or write unsupported types.SetSingle<IActionValueBinder>(new DefaultActionValueBinder());
SetSingle<IApiExplorer>(new ApiExplorer(configuration));
SetSingle<IAssembliesResolver>(new DefaultAssembliesResolver());
SetSingle<IBodyModelValidator>(new DefaultBodyModelValidator());
SetSingle<IContentNegotiator>(new DefaultContentNegotiator());
SetSingle<IDocumentationProvider>(null); // MissingSetMultiple<IFilterProvider>(new ConfigurationFilterProvider(),
new ActionDescriptorFilterProvider());SetSingle<IHostBufferPolicySelector>(null);
SetSingle<IHttpActionInvoker>(new ApiControllerActionInvoker());
SetSingle<IHttpActionSelector>(new ApiControllerActionSelector());
SetSingle<IHttpControllerActivator>(new DefaultHttpControllerActivator());
SetSingle<IHttpControllerSelector>(new DefaultHttpControllerSelector(configuration));
SetSingle<IHttpControllerTypeResolver>(new DefaultHttpControllerTypeResolver());
SetSingle<ITraceManager>(new TraceManager());
SetSingle<ITraceWriter>(null);// This is a priority list. So put the most common binders at the top.
SetMultiple<ModelBinderProvider>(new TypeConverterModelBinderProvider(),
new TypeMatchModelBinderProvider(),
new KeyValuePairModelBinderProvider(),
new ComplexModelDtoModelBinderProvider(),
new ArrayModelBinderProvider(),
new DictionaryModelBinderProvider(),
new CollectionModelBinderProvider(),
new MutableObjectModelBinderProvider());
SetSingle<ModelMetadataProvider>(new DataAnnotationsModelMetadataProvider());
SetMultiple<ModelValidatorProvider>(new DataAnnotationsModelValidatorProvider(),
new DataMemberModelValidatorProvider());// This is an ordered list,so put the most common providers at the top.
SetMultiple<ValueProviderFactory>(new QueryStringValueProviderFactory(),
new RouteDataValueProviderFactory());ModelValidatorCache validatorCache = new ModelValidatorCache(new Lazy<IEnumerable<ModelValidatorProvider>>(() => this.GetModelValidatorProviders()));
SetSingle<IModelValidatorCache>(validatorCache);SetSingle<IExceptionHandler>(new DefaultExceptionHandler());
SetMultiple<IExceptionLogger>();_serviceTypesSingle = new HashSet<Type>(_defaultServicesSingle.Keys);
_serviceTypesMulti = new HashSet<Type>(_defaultServicesMulti.Keys);// Reset the caches and the known dependency scope
ResetCache();
}
默认的Action绑定规则:ParameterBindingRules
ParameterBindingRules = DefaultActionValueBinder.GetDefaultParameterBinders();
有兴趣的朋友可以下载web Api 源码查看。http://aspnetwebstack.codeplex.com/wikipage?title=Contributors.
下面将继续讲解剖析HttpServer。
Web API 源码剖析之默认配置(HttpConfiguration)