Question

我在WEB API项目中遇到了这个奇怪的问题。这是我项目的代码片段：

模特课程：

       [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;}
       }

控制器类方法：

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

我正在使用fiddler将以下xml发布到控制器：

    <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 >

该方法已成功从 Fiddler 调用，但并非所有属性都与xml元素值绑定。

studentInfo对象如下所示：

    StudentId        ST00001
    FirstNme         null
    LastNme          null
    ContactNumber    null
    Gender           null
    Course           null
    CreatedDate      01/01/0001T:00:00   -- Value is being changed by the controller 
                                            code later.

我尝试删除了DatContract和DataMember attrributes，但结果是一样的。我使用默认的 DataContractSerialization ，并尝试使用 XMLSerialization ，但没有用。

请让我知道我在这里缺少什么，我该如何解决。

Answer 1

根本原因是缺少Order属性。我按照以下方式更新了您的模型，并按预期进行了解析：

[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; }
}

同时考虑在请求中跳过CreatedDate，因为您希望服务器填写它。正文应如下所示（不要忘记将MvcApplication3.Controllers替换为您的命名空间：

  <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 >

ASP.NET WEB API中的模型绑定问题

1 个答案: