如何提取自定义标头值？ [英] How to extract custom header value?
问题描述
我从项目中的可接受答案中获得了确切的代码，需要将其迁移到ASP.NET Core MVP中。
I have this exact code from the accepted answer in my project which I need to migrate into ASP.NET Core MVP.
var env = Request.Headers.GetValues("environment").First();
如何在.NET Core中实现呢？
How can I implement this in .NET Core?
我希望这不会被视为重复的问题，因为我正在尝试使用新系统而不是旧系统来做到这一点。如果有人在当前版本的链接中添加答案，我也可以。
I hope this is not considered to be a duplicate question because I am trying to do this with the new system rather than the old one. I would also be fine if someone adds an answer to the link regarding the current version.
编辑： ASP.NET 5中HTTP标头的所有类型都在哪里？我尝试了此链接，但API可能具有改变了。我也不认为这是该问题的重复项。
Where all types for http headers gone in ASP.NET 5? I tried this link but API may have changed. I don't think this is a duplicate for that question either.
推荐答案
Request.Headers返回定义了Microsoft.AspNetCore.Http.IHeaderDictionary 接口下一个属性：
Request.Headers returns Microsoft.AspNetCore.Http.IHeaderDictionary interface that define next property:
StringValues this[string key] { get; set; }
IHeaderDictionary与IDictionary具有不同的索引器合约，它将在其中返回StringValues.Empty缺少条目。
IHeaderDictionary has a different indexer contract than IDictionary, where it will return StringValues.Empty for missing entries.
返回类型：Microsoft.Extensions.Primitives.StringValues
Return type: Microsoft.Extensions.Primitives.StringValues
返回：存储值或StringValues.Empty（如果键不存在）。
Returns: The stored value, or StringValues.Empty if the key is not present.
因此，您可以简单地使用 Request .Headers [ environment] 获取 environment标题的值
So, you can simply use Request.Headers["environment"] to get value of "environment" header
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