MVC 返回对象换成json

错误界面：



这个就是返回对象没有转换成json

就是要再返回的头部添加application/json

代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Net.Http.Formatting;
using System.Net.Http.Headers;
using System.Web;

namespace WorkOrderManage.API.Utility
{
public class JsonContentNegotiator : IContentNegotiator
{
private readonly JsonMediaTypeFormatter _jsonFormatter;

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

public ContentNegotiationResult Negotiate(Type type, HttpRequestMessage request, IEnumerable<MediaTypeFormatter> formatters)
{
var result = new ContentNegotiationResult(_jsonFormatter, new MediaTypeHeaderValue("application/json"));
return result;
}
public static DateTime GetTime(string timeStamp)
{
DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
long lTime = long.Parse(timeStamp + "0000000");
TimeSpan toNow = new TimeSpan(lTime);
return dtStart.Add(toNow);
}
}
}

再在全局文件Global.asax的Application_start里面添加

var jsonFormatter = new JsonMediaTypeFormatter();
GlobalConfiguration.Configuration.Services.Replace(typeof(IContentNegotiator), new JsonContentNegotiator(jsonFormatter));

返回界面



发现content-type里面有application/json