.Net Core Web API不同的JSON外殼每個控制器

Question

我們正試圖將舊的API遷移到我們當前的.Net Core Web API中。我們目前的API使用camelCasing返回JSON，但我們的舊API使用PascalCasing，我們不想更新客戶端。

有沒有什麼方法可以指定我們想要使用每個控制器的序列化策略，而不是整個服務的全局？

Answer 1

是的，你可以通過在控制器上使用屬性來實現它。請參見下面的示例：

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)] 
public class CustomJsonFormatter : ActionFilterAttribute 
{ 
    private readonly string formatName = string.Empty; 
    public CustomJsonFormatter(string _formatName) 
    { 
     formatName = _formatName; 
    } 

    public override void OnActionExecuted(ActionExecutedContext context) 
    { 
     if (context == null || context.Result == null) 
     { 
      return; 
     } 

     var settings = JsonSerializerSettingsProvider.CreateSerializerSettings(); 

     if (formatName == "camel") 
     { 
      settings.ContractResolver = new Newtonsoft.Json.Serialization.CamelCasePropertyNamesContractResolver(); 
     }    
     else 
     { 
      settings.ContractResolver = new Newtonsoft.Json.Serialization.DefaultContractResolver(); 
     } 

     var formatter = new JsonOutputFormatter(settings, ArrayPool<Char>.Shared); 

     (context.Result as Microsoft.AspNetCore.Mvc.OkObjectResult).Formatters.Add(formatter); 
    } 
} 

，這裏是你的控制器：

[CustomJsonFormatter("camel")] 
[Route("api/[controller]")] 
public class ValuesController : Controller 
{ 
    // GET: api/values 
    [HttpGet] 
    public IActionResult Get() 
    { 
     Car car = new Car { Color = "red", Make = "Nissan" }; 

     return Ok(car); 
    }   
}