从 Web Api 控制器返回 http 状态代码

问题描述

我正在尝试为 Web api 控制器中的 GET 方法返回未修改的 304 状态代码.

I'm trying to return a status code of 304 not modified for a GET method in a web api controller.

我成功的唯一方法是这样的:

The only way I succeeded was something like this:

public class TryController : ApiController
{
    public User GetUser(int userId, DateTime lastModifiedAtClient)
    {
        var user = new DataEntities().Users.First(p => p.Id == userId);
        if (user.LastModified <= lastModifiedAtClient)
        {
             throw new HttpResponseException(HttpStatusCode.NotModified);
        }
        return user;
    }
}

这里的问题是它不是一个例外，它只是没有被修改所以客户端缓存是可以的.我还希望返回类型是用户(如所有 web api 示例显示的 GET)不返回 HttpResponseMessage 或类似的东西.

The problem here is that it's not an exception, It's just not modified so the client cache is OK.I also want the return type to be a User (as all the web api examples shows with GET) not return HttpResponseMessage or something like this.

推荐答案

我不知道答案所以问了 ASP.NET 团队 此处.

I did not know the answer so asked the ASP.NET team here.

所以诀窍是将签名更改为 HttpResponseMessage 并使用 Request.CreateResponse.

So the trick is to change the signature to HttpResponseMessage and use Request.CreateResponse.

[ResponseType(typeof(User))]
public HttpResponseMessage GetUser(HttpRequestMessage request, int userId, DateTime lastModifiedAtClient)
{
    var user = new DataEntities().Users.First(p => p.Id == userId);
    if (user.LastModified <= lastModifiedAtClient)
    {
         return new HttpResponseMessage(HttpStatusCode.NotModified);
    }
    return request.CreateResponse(HttpStatusCode.OK, user);
}

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