在Web Api中執行PUT時的NullObjectReference

Question

我正在嘗試更新類「Conversation」中的變量，將參數對象由於某種原因而未綁定。我不知道爲什麼不。結果我收到此錯誤：

"Object reference not set to an instance of an object.",

控制器：

[HttpPut] 
public async Task<IHttpActionResult> AddMember(string key, User user) 
{ 
    if (!ModelState.IsValid) 
    { 
     return BadRequest(ModelState); 
    } 

    Conversation conver = await db.Conversations.FindAsync(key);  //THIS IS NULL 

    if (conver == null) 
    { 
     return NotFound();  //METHOD IS ENDING HERE 
    } 

    conver.Members.Add(user); //THIS IS NULL 

    db.Entry(conver).State = EntityState.Modified; 
    try 
    { 
     await db.SaveChangesAsync(); 
    } 
    catch (DbUpdateConcurrencyException) 
    { 
     return NotFound(); 
    } 

    return StatusCode(HttpStatusCode.NoContent); 
} 

Model類用戶：

namespace AcademicAssistant.Models 
{ 
    [DataContract] 
    public class User 
    { 
     [Key] 
     [DataMember] 
     public string Email { get; set; } 

     [DataMember] 
     public string Password { get; set; } 

     [DataMember] 
     public bool Admin { get; set; } 

    } 
} 

模型類的對話：

[DataContract] 
public class Conversation 
{ 
    [Key] 
    [DataMember] 
    public string Key { get; set; } 

    [DataMember] 
    public string ConversationName { get; set; } 

    [DataMember] 
    public string Administrator { get; set; } 

    [DataMember] 
    public virtual ICollection<User> Members { get; set; } 

    [DataMember] 
    public virtual ICollection<Message> Messages { get; set; } 

} 

我在郵差這樣的測試此：

ROUTE = api/Conversations/AddMember/?key="1LM4"

JSON = {"user": { "Email": "56@56.com", "Password" : "Passw-1", "Admin" : true } }

Answer 1

SOLUTION：

的路線應該是

api/Conversations/AddMember/?key=1LM4

和JSON格式l ike this：

{ 
    "Email": "56@56.com", 
    "Password" : "Passw-1", 
    "Admin" : true 
}