如何强制 ASP.NET Web API 始终返回 JSON? [英] How to force ASP.NET Web API to always return JSON?

问题描述

ASP.NET Web API 默认进行内容协商 - 将根据 Accept 标头返回 XML 或 JSON 或其他类型.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?

ASP.NET Web API does content negotiation by default - will return XML or JSON or other type based on the Accept header. I don't need / want this, is there a way (like an attribute or something) to tell Web API to always return JSON?

推荐答案

在 ASP.NET Web API 中仅支持 JSON – 正确的方法

用 JsonContentNegotiator 替换 IContentNegotiator:

Replace IContentNegotiator with JsonContentNegotiator:

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

JsonContentNegotiator 实现:

JsonContentNegotiator implementation:

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"));
    }
}

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