我的Web API C＃.net服务器无法反序列化JSON对象

This my client code

这是我的客户端代码

var sayeed = { firstname: "Sayeed", surname: "Alquiaty" };
alert(JSON.stringify({ person: sayeed }));
$.ajax({
    url: "api/parent",
    type: "POST",
    contentType: "application/json; charset=utf-8",
    data: JSON.stringify({ person: sayeed }),
    success: function(response) {
        response ? alert("It worked!") : alert("It didn't work.");
    }
});
var sayeed =