C# 解决跨域问题

WebApiConfig.cs

添加 config.EnableCors();

public static void Register(HttpConfiguration config)
        {
            // Web API 配置和服务

            //跨域配置
            config.EnableCors();

            // Web API 路由
            config.MapHttpAttributeRoutes();

            config.Routes.MapHttpRoute(
                name: "DefaultApi",
                routeTemplate: "api/{controller}/{id}",
                defaults: new { id = RouteParameter.Optional }
            );
        }

Controllers

在API的类上面使用特性标注

[EnableCors(origins: "*", headers: "*", methods: "GET,POST,PUT,DELETE")]

[EnableCors(origins: "*", headers: "*", methods: "GET,POST,PUT,DELETE")]
    public class TextController : ApiController
    {
        [HttpGet]
        public string Get()
        {
            return "Success";
        }
    }