C# ASP.NET WEB API中的模型绑定问题

在我的

webapi

项目中，我面临着这个奇怪的问题。 以下是我的项目的代码片段：

型号类别：

       [DataContract]
       public class StudentInfo
       {
         [Key]
         [DataMember]
         [StringLength(20)]
         public string StudentId {get; set;}

         [Key]
         [DataMember]
         [StringLength(20)]
         public string FirstName {get; set;}

         [Key]
         [DataMember]
         [StringLength(20)]
         public string LastName {get; set;}

         [DataMember]
         [StringLength(20)]
         public string ContactNumber {get; set;}

         [DataMember]
         [StringLength(20)]
         public string Gender {get; set;}

         [DataMember]
         [StringLength(20)]
         public string Course {get; set;}

         [DataMember]
         public DateTime? CreatedDate {get; set;}
       }

    [Route("/Student/AddNewStudent")]
    [HttpPost]
    public IHttpActionResult AddNewStudent([FromBody]StudentInfo studentInfo)
    {
      /* Business Logic Here */
    }

    <StudentInfo xmlns:www.w3........ xmlns:something>
        <StudentId>ST00001</StudentId>
        <FirstName>John</FirstName>
        <LastName>Smith</LastName>
        <ContactNumber>9001236597</ContactNumber>
        <Gender>MALE</Gender>
        <Course>Computer Science</Course>
        <CreatedDate />    -- Value assigned from controller code
    </StudentInfo >

控制器类方法：

       [DataContract]
       public class StudentInfo
       {
         [Key]
         [DataMember]
         [StringLength(20)]
         public string StudentId {get; set;}

         [Key]
         [DataMember]
         [StringLength(20)]
         public string FirstName {get; set;}

         [Key]
         [DataMember]
         [StringLength(20)]
         public string LastName {get; set;}

         [DataMember]
         [StringLength(20)]
         public string ContactNumber {get; set;}

         [DataMember]
         [StringLength(20)]
         public string Gender {get; set;}

         [DataMember]
         [StringLength(20)]
         public string Course {get; set;}

         [DataMember]
         public DateTime? CreatedDate {get; set;}
       }

    [Route("/Student/AddNewStudent")]
    [HttpPost]
    public IHttpActionResult AddNewStudent([FromBody]StudentInfo studentInfo)
    {
      /* Business Logic Here */
    }

    <StudentInfo xmlns:www.w3........ xmlns:something>
        <StudentId>ST00001</StudentId>
        <FirstName>John</FirstName>
        <LastName>Smith</LastName>
        <ContactNumber>9001236597</ContactNumber>
        <Gender>MALE</Gender>
        <Course>Computer Science</Course>
        <CreatedDate />    -- Value assigned from controller code
    </StudentInfo >

我正在使用fiddler将以下xml发布到控制器：

       [DataContract]
       public class StudentInfo
       {
         [Key]
         [DataMember]
         [StringLength(20)]
         public string StudentId {get; set;}

         [Key]
         [DataMember]
         [StringLength(20)]
         public string FirstName {get; set;}

         [Key]
         [DataMember]
         [StringLength(20)]
         public string LastName {get; set;}

         [DataMember]
         [StringLength(20)]
         public string ContactNumber {get; set;}

         [DataMember]
         [StringLength(20)]
         public string Gender {get; set;}

         [DataMember]
         [StringLength(20)]
         public string Course {get; set;}

         [DataMember]
         public DateTime? CreatedDate {get; set;}
       }

    [Route("/Student/AddNewStudent")]
    [HttpPost]
    public IHttpActionResult AddNewStudent([FromBody]StudentInfo studentInfo)
    {
      /* Business Logic Here */
    }

    <StudentInfo xmlns:www.w3........ xmlns:something>
        <StudentId>ST00001</StudentId>
        <FirstName>John</FirstName>
        <LastName>Smith</LastName>
        <ContactNumber>9001236597</ContactNumber>
        <Gender>MALE</Gender>
        <Course>Computer Science</Course>
        <CreatedDate />    -- Value assigned from controller code
    </StudentInfo >

我尝试删除DatContract和DataMember属性，但结果是一样的。我正在使用默认的DataContractSerialization，也尝试了XMLSerialization，但没有任何用处

---

请告诉我这里缺少什么，以及如何修复。

根本原因是缺少

订单

属性。我已按如下方式更新了您的模型，并按预期对其进行了分析：

[DataContract]
public class StudentInfo
{
    [Key]
    [DataMember(Order = 0)]
    [StringLength(20)]
    public string StudentId { get; set; }

    [Key]
    [DataMember(Order = 1)]
    [StringLength(20)]
    public string FirstName { get; set; }

    [Key]
    [DataMember(Order = 2)]
    [StringLength(20)]
    public string LastName { get; set; }

    [DataMember(Order = 3)]
    [StringLength(20)]
    public string ContactNumber { get; set; }

    [DataMember(Order = 4)]
    [StringLength(20)]
    public string Gender { get; set; }

    [DataMember(Order = 5)]
    [StringLength(20)]
    public string Course { get; set; }

    [DataMember(Order = 6)]
    public DateTime? CreatedDate { get; set; }
}

还考虑在请求中跳过<代码> CreatedDate <代码>，因为您希望服务器填写它。正文应如下所示（不要忘记将

mvcapapplication3.Controllers

替换到命名空间中：

  <StudentInfo xmlns="http://schemas.datacontract.org/2004/07/MvcApplication3.Controllers">
        <StudentId>ST00001</StudentId>
        <FirstName>John</FirstName>
        <LastName>Smith</LastName>
        <ContactNumber>9001236597</ContactNumber>
        <Gender>MALE</Gender>
        <Course>Computer Science</Course>
    </StudentInfo >

ST00001
约翰
史密斯
9001236597
男性
计算机科学

根本原因缺少

Order

属性。我已按如下方式更新了您的模型，并按预期对其进行了分析：

[DataContract]
public class StudentInfo
{
    [Key]
    [DataMember(Order = 0)]
    [StringLength(20)]
    public string StudentId { get; set; }

    [Key]
    [DataMember(Order = 1)]
    [StringLength(20)]
    public string FirstName { get; set; }

    [Key]
    [DataMember(Order = 2)]
    [StringLength(20)]
    public string LastName { get; set; }

    [DataMember(Order = 3)]
    [StringLength(20)]
    public string ContactNumber { get; set; }

    [DataMember(Order = 4)]
    [StringLength(20)]
    public string Gender { get; set; }

    [DataMember(Order = 5)]
    [StringLength(20)]
    public string Course { get; set; }

    [DataMember(Order = 6)]
    public DateTime? CreatedDate { get; set; }
}

还考虑在请求中跳过<代码> CreatedDate <代码>，因为您希望服务器填写它。主体应该看起来像下面的（不要忘记将<代码> MVCpApult3.3控制器< /C> >到您的命名空间：

  <StudentInfo xmlns="http://schemas.datacontract.org/2004/07/MvcApplication3.Controllers">
        <StudentId>ST00001</StudentId>
        <FirstName>John</FirstName>
        <LastName>Smith</LastName>
        <ContactNumber>9001236597</ContactNumber>
        <Gender>MALE</Gender>
        <Course>Computer Science</Course>
    </StudentInfo >

ST00001
约翰
史密斯
9001236597
男性
计算机科学

添加Order属性后代码运行良好。非常感谢…：）添加Order属性后代码运行良好。非常感谢…：）