asp.Netcore WebApiはHttpResponseMessageを返します

ASP.NET WebApi 2のコード例:

[Route("values/{id}")]
public async Task Get(string id)
{
    var response = Request.CreateResponse(HttpStatusCode.OK);
    var accept = Request.Headers.Accept;
    var result = await _valuesService.Get(id);

    if (accept.Any(x => x.MediaType == "text/html"))
    {
        response.Content = new StringContent(result, Encoding.UTF8, "text/html");
    }
    else
    {
        response.Content = new StringContent(result, Encoding.UTF8, "text/plain");
    }
    return response;
}

ASP.NET Core WebApiのコード例:

[Route("values/{id}")]
public async Task Get(string id)
{
    var accept = Request.GetTypedHeaders().Accept;
    var result = await _valuesService.Get(id);
    var data = Encoding.UTF8.GetBytes(result);
    if (accept.Any(x => x.MediaType == "text/html"))
    {
        Response.ContentType = "text/html";
    }
    else
    {
        Response.ContentType = "text/plain";
    }
    await Response.Body.WriteAsync(data, 0, data.Length);
}

変化は大きく、主に2つの側面が見られます.Request.CreateResponseがなくなり、Acceptを取得するにはRequest.GetTypedHeaders()を通過する必要があります.戻り値はなく、Response.Bodyに直接データストリームで書き込まれる.