C# Code:

public class WebApiConfig
{
   public static void Register(HttpConfiguration config)
   {
      // Web API 配置和服务
      var cors = new EnableCorsAttribute("*", "*", "*");
      config.EnableCors(cors);
      
      // Web API 路由
      config.MapHttpAttributeRoutes();
      config.Routes.MapHttpRoute(
      name: "DefaultApi",
      routeTemplate: "api/{controller}/{id}",
      defaults: new { id = RouteParameter.Optional }
      );
      
      GlobalConfiguration.Configuration.Formatters.Insert(0, new PlainTextTypeFormatter());
      
      config.Formatters.Remove(config.Formatters.XmlFormatter);
      
      // 解决json序列化时的循环引用问题
      config.Formatters.JsonFormatter.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore;
      
      // 对 JSON 数据使用混合大小写。驼峰式,但是是javascript 首字母小写形式.
      //config.Formatters.JsonFormatter.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
      // 对 JSON 数据使用混合大小写。跟属性名同样的大小.输出
      config.Formatters.JsonFormatter.SerializerSettings.ContractResolver = new UnderlineSplitContractResolver();
   }
}

//来源:C/S框架网(www.csframework.com) QQ:23404761

C# Code:

[RoutePrefix("api/demo")]
public class DemoController : ApiController
{
   [HttpGet]
   [Route("get")]
   public IEnumerable<string> Get()
   {
      return new string[]
      {
         "CSFramework.WebAPI.Demo",
         "www.csframework.com - C/S框架网",
         "www.cscode.net - C/S框架网",
         "CSFramework.WebAPI.Demo WebApi服务器作者：孙中吕"
         };
      }
      
      [HttpGet]
      [Route("get1")]
      public string Get(int id)
      {
         return "CSFramework.WebAPI.Demo,GET返回结果:\r\n" + id.ToString();
      }
      
      [HttpPost]
      [Route("post")]
      public string Post(dynamic modelObject)
      {
         return "CSFramework.WebAPI.Demo,Post返回结果:\r\n" + modelObject.ToString();
      }
   }
   
   //来源:C/S框架网(www.csframework.com) QQ:23404761