Web API 源码剖析之默认配置（HttpConfiguration）

Formatters

Services

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); // Missing

SetMultiple<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