用json在自定义类中保存数据

Question

我仍然试图理解这个ajax。

我试图从JS病人保存到服务器端的数据库，但低于总的代码导致[警报（“错误”）

有人能看到错误？

MVC行动：

public JsonResult CreatePatient(string patient) 
{ 
    var jsonPatient = JsonConvert.DeserializeObject<Patient>(patient); 

    if (db.Patients.Contains(jsonPatient)) 
    { 
     db.Patients.Remove(jsonPatient); 
    } 
    db.Patients.Add(jsonPatient); 

    return new JsonResult(); 
} 

自定义类：

public class Patient 
{ 
    [Key] 
    public string Cpr { get; set; }   //ID 
    private string _firstname; 
    private string _lastname; 

    //public List<TestReceving> TestHandelings { get; set; } 

    public string Firstname 
    { 
     get { return _firstname; } 
     set { _firstname = value; } 
    } 

    public string Lastname 
    { 
     get { return _lastname; } 
     set { _lastname = value; } 
    } 
    public override bool Equals(object obj) 
    { 
     return obj is Patient ? Cpr == (obj as Patient).Cpr : false; 
    } 
} 

JS：

function savePatient() { 
    var Patient = { 
     Cpr: $("#cpr").val(), 
     Lastname: $("#lastname").val(), 
     Firstname: $("#firstname").val() 
    }; 

    var dataToPost = JSON.stringify(Patient); 

    $.ajax({ 
     type: "POST", 
     url: "/Patient/CreatePatient", 
     contentType: "application/json; charset=utf-8", 
     data: dataToPost, 
     dataType: "json", 
     success: function() { 
      // do what you want on success. 
      alert("saved"); 
     }, 
     error: function() { 
      alert("error"); 
     } 
    }); 
} 

我已经把它改为：

public JsonResult CreatePatient(Patient patient) 
{ 
    if (db.Patients.Contains(patient)) 
    { 
     db.Patients.Remove(patient); 
    } 
    db.Patients.Add(patient); 

    return new JsonResult(); 
} 

和

function savePatient() { 
    var Patient = { 
     Cpr: $("#cpr").val(), 
     Lastname: $("#lastname").val(), 
     Firstname: $("#firstname").val() 
    }; 

    $.ajax({ 
     type: "POST", 
     url: "/Patient/CreatePatient", 
     contentType: "application/json; charset=utf-8", 
     data: Patient, 
     dataType: "json", 
     success: function() { 
      // do what you want on success. 
      alert("saved"); 
     }, 
     error: function() { 
      alert("error"); 
     } 
    }); 
} 

但我仍然得到错误。

Answer 1

你不需要JSON.stringify，只需发送Patient如：

data: Patient, 

，并在行动中收到：

public JsonResult CreatePatient(Patient patient) 
{ 
    ... 
} 

更新：在发送原始JSON（不字符串化）contentType: "application/json"不应该使用。

Answer 2

添加[HttpPost]方法体属性像

[HttpPost] 
public JsonResult CreatePatient(Patient patient){...}