[英]WebApi: Attach MediaTypeFormatter to Controller
我想从项目的全局格式化程序中删除XmlFormatter
。 我正在为此:
var formatters = GlobalConfiguration.Configuration.Formatters;
formatters.Remove(formatters.XmlFormatter)
但是同时我想拥有一个可以返回xml
数据类型的控制器。 是否可以用特定属性装饰控制器或以某种方式将XmlFormatter附加到此控制器?
您需要创建一个自定义System.Net.Http.Formatting.IContentNegotiator类,然后将选定的格式化程序签入Negotiate
方法中。
public class ApplicationContentNegotiator : IContentNegotiator
{
private readonly JsonMediaTypeFormatter _jsonFormatter;
private readonly MediaTypeHeaderValue _jsonMediaType;
private readonly XmlMediaTypeFormatter _xmlFormatter;
private readonly MediaTypeHeaderValue _xmlMediaType;
public static IContentNegotiator Create()
{
return new ApplicationContentNegotiator();
}
private ApplicationContentNegotiator()
{
_jsonFormatter = new JsonMediaTypeFormatter();
_jsonMediaType = MediaTypeHeaderValue.Parse("application/json");
_xmlFormatter = new XmlMediaTypeFormatter();
_xmlMediaType = MediaTypeHeaderValue.Parse("application/xml");
}
public ContentNegotiationResult Negotiate(Type type, HttpRequestMessage request, IEnumerable<MediaTypeFormatter> formatters)
{
var controller = new DefaultHttpControllerSelector(request.GetConfiguration()).SelectController(request);
if (controller.ControllerName == "MyController")
return new ContentNegotiationResult(_xmlFormatter, _xmlMediaType);
return new ContentNegotiationResult(_jsonFormatter, _jsonMediaType);
}
}
然后将您的IContentNegotiator
实现服务替换为HttpConfiguration
对象
GlobalConfiguration.Configuration.Services.Replace(typeof(IContentNegotiator), ApplicationContentNegotiator.Create());
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