asp.net-mvc - 如何强制 ASP.NET Web API 始终返回 JSON？

Question

ASP.NET Web API 默认进行内容协商 - 将基于 Accept 返回 XML 或 JSON 或其他类型标题。我不需要/想要这个，有没有办法(比如属性或其他东西)告诉 Web API 总是返回 JSON？

Answer 1

Supporting only JSON in ASP.NET Web API – THE RIGHT WAY

用 JsonContentNegotiator 替换 IContentNegotiator:

var jsonFormatter = new JsonMediaTypeFormatter();
//optional: set serializer settings here
config.Services.Replace(typeof(IContentNegotiator), new JsonContentNegotiator(jsonFormatter));

JsonContentNegotiator 实现:

public class JsonContentNegotiator : IContentNegotiator
{
    private readonly JsonMediaTypeFormatter _jsonFormatter;

    public JsonContentNegotiator(JsonMediaTypeFormatter formatter) 
    {
        _jsonFormatter = formatter;    
    }

    public ContentNegotiationResult Negotiate(
            Type type, 
            HttpRequestMessage request, 
            IEnumerable<MediaTypeFormatter> formatters)
    {
        return new ContentNegotiationResult(
            _jsonFormatter, 
            new MediaTypeHeaderValue("application/json"));
    }
}