问题描述
以前，在 WebApi(在 .NET 4.x 上)中，我们可以通过类型化接口处理请求和响应的标头(请参阅 HttpRequestMessage.Headers/HttpResponseMessage.Headers).现在，在 ASP.NET 5 中，我们有 HttpRequest 和 HttpResponse 以及类型为 IHeaderDictionary 的 Headers 属性.但它只是一个无类型的字典.
Previously, in WebApi (on .NET 4.x) we could work with headers of both the request and the response via typed interfaces (see HttpRequestMessage.Headers/HttpResponseMessage.Headers).Now, in ASP.NET 5 we have HttpRequest and HttpResponse with Headers property of type IHeaderDictionary. But it's just an untyped Dictionary.
下面我举了一个例子，类型化访问可以返回一个微调的 http-response.需要创建一个 HttpResponseMessage 并填充其 Headers 集合(顺便说一句).
Below I put an example with typed accessing could return a fine-tuned http-response. It's needed to create a HttpResponseMessage and fill its Headers collection (which was typed btw).
HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.OK);
response.Content = new StringContent(manifestContent);
response.Content.Headers.ContentType = new MediaTypeHeaderValue("text/cache-manifest");
response.Headers.CacheControl = new CacheControlHeaderValue {NoCache = true, Public = true};
response.Headers.ETag = new EntityTagHeaderValue(""" + etag + """);
推荐答案
如果为Microsoft.AspNetCore.Http添加using语句，HttpRequest 和 HttpResponse 到 GetTypedHeaders，这应该会为您提供所需的类型安全性.
If you add the using statement for Microsoft.AspNetCore.Http, there are extension methods on the HttpRequest and HttpResponse to GetTypedHeaders, which should give you the type safety that you want.
在示例中，我还添加了 Microsoft.Net.Http.Headers 的 using 语句，只是为了清理它.
In the example, I also added the using statement for Microsoft.Net.Http.Headers, just to clean it up.
var headers = Response.GetTypedHeaders();
headers.ContentType = new MediaTypeHeaderValue("text/cache-manifest");
headers.CacheControl = new CacheControlHeaderValue { NoCache = true, Public = true };
headers.ETag = new EntityTagHeaderValue(""" + etag + """);
来源:aspnet/HttpAbstractions onGithub
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