XML 反序列化返回 Null 值

Question

我在 Web API 中有一个 POST 方法，该方法具有

RequestAppointment

参数。例如：

 // POST: api/RequestAppointment
            public HttpResponseMessage Post([FromBody]RequestAppointment httpRequest)
            {
                var response = Appointment.CreateAppointment(httpRequest);
    
                return Request.CreateResponse<ResponseRequest>(System.Net.HttpStatusCode.Created, response); 
            } 

RequestAppoint

类具有以下结构：

public partial class RequestAppointment
    {
        public RequestAppointmentAppointmentInformation appointmentInformation { get; set; }      
    }
    public partial class RequestAppointmentAppointmentInformation
    {
        public string AppointmentCcEmail { get; set; }        
        public string ClaimType { get; set; }       
        public RequestAppointmentAppointmentInformationClaimant Claimant { get; set; }
       
    }
    public partial class RequestAppointmentAppointmentInformationClaimant
    {
        public System.DateTime DateOfBirth { get; set; }        
    }

可以提出两个请求：
第一个是：

<RequestAppointment>
  <appointmentInformation>
    <AppointmentCcEmail>x.x.com</AppointmentCcEmail>   
    <ClaimType>A</ClaimType>
    <Claimant>
      <DateOfBirth>1961-12-25</DateOfBirth>
    </Claimant>
  </appointmentInformation>
</RequestAppointment>

第二个请求是：

<RequestAppointment>
  <appointmentInformation>
    <AppointmentCcEmail>x.x.com</AppointmentCcEmail>   
    <ClaimType>A</ClaimType>   
  </appointmentInformation>
</RequestAppointment>

两个请求 XML 的区别在于 #1 有 Claimant 标签，而 #2 没有。

第二个请求没有，因为当用户从数据接口调用Web服务时，没有提供索赔人。当提供索赔人时，第一个总是会出现。

在我使用 Fiddler 进行测试时，我的 #1 请求返回数据。也就是说，它能够反序列化为对象 RequestAppointment，而 #2 请求返回 null 值。

我可以做什么来解决这个问题？请求将始终采用这两种格式，并且它们将始终使用相同的模型结构。

我可以做什么来解决这个问题？我在 Fiddler 中测试了该场景。

Answer 1

首先，第1步。如果您有

RequestAppointment

XSD文件，最好的解决方案是使用xsd.exe生成类参见如何使用它，如果没有，您可以自己创建XSD并执行第1步，或者最后您应该进行更改并指向显式属性，使您的类 XML 可序列化。有很多关于它的文章。

这个类是用 xsd.exe 生成的，我从 XML 创建示例架构，仅在标记

<Claimant>

中进行更改，使其成为可选，并且类看起来像这样。注意工具如何生成可选字段

Claimant

//------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated by a tool.
//     Runtime Version:4.0.30319.42000
//
//     Changes to this file may cause incorrect behavior and will be lost if
//     the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------

using System.Xml.Serialization;

// 
// This source code was auto-generated by xsd, Version=4.6.1055.0.
// 


/// <remarks/>
[System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "4.6.1055.0")]
[System.SerializableAttribute()]
[System.Diagnostics.DebuggerStepThroughAttribute()]
[System.ComponentModel.DesignerCategoryAttribute("code")]
[System.Xml.Serialization.XmlTypeAttribute(AnonymousType=true)]
[System.Xml.Serialization.XmlRootAttribute(Namespace="", IsNullable=false)]
public partial class RequestAppointment {

    private RequestAppointmentAppointmentInformation appointmentInformationField;

    /// <remarks/>
    public RequestAppointmentAppointmentInformation appointmentInformation {
        get {
            return this.appointmentInformationField;
        }
        set {
            this.appointmentInformationField = value;
        }
    }
}

/// <remarks/>
[System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "4.6.1055.0")]
[System.SerializableAttribute()]
[System.Diagnostics.DebuggerStepThroughAttribute()]
[System.ComponentModel.DesignerCategoryAttribute("code")]
[System.Xml.Serialization.XmlTypeAttribute(AnonymousType=true)]
public partial class RequestAppointmentAppointmentInformation {

    private string appointmentCcEmailField;

    private string claimTypeField;

    private RequestAppointmentAppointmentInformationClaimant claimantField;

    /// <remarks/>
    public string AppointmentCcEmail {
        get {
            return this.appointmentCcEmailField;
        }
        set {
            this.appointmentCcEmailField = value;
        }
    }

    /// <remarks/>
    public string ClaimType {
        get {
            return this.claimTypeField;
        }
        set {
            this.claimTypeField = value;
        }
    }

    /// <remarks/>
    public RequestAppointmentAppointmentInformationClaimant Claimant {
        get {
            return this.claimantField;
        }
        set {
            this.claimantField = value;
        }
    }
}

/// <remarks/>
[System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "4.6.1055.0")]
[System.SerializableAttribute()]
[System.Diagnostics.DebuggerStepThroughAttribute()]
[System.ComponentModel.DesignerCategoryAttribute("code")]
[System.Xml.Serialization.XmlTypeAttribute(AnonymousType=true)]
public partial class RequestAppointmentAppointmentInformationClaimant {

    private System.DateTime dateOfBirthField;

    /// <remarks/>
    [System.Xml.Serialization.XmlElementAttribute(DataType="date")]
    public System.DateTime DateOfBirth {
        get {
            return this.dateOfBirthField;
        }
        set {
            this.dateOfBirthField = value;
        }
    }
}

XSD 示例

<?xml version="1.0" encoding="utf-8"?>
<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="RequestAppointment">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="appointmentInformation">
          <xs:complexType>
            <xs:sequence>
              <xs:element name="AppointmentCcEmail" type="xs:string" />
              <xs:element name="ClaimType" type="xs:string" />
              <xs:element name="Claimant" minOccurs="0">
                <xs:complexType>
                  <xs:sequence>
                    <xs:element name="DateOfBirth" type="xs:date" />
                  </xs:sequence>
                </xs:complexType>
              </xs:element>
            </xs:sequence>
          </xs:complexType>
        </xs:element>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>

Answer 2

感谢您的所有建议。他们都是伟大的！ Seyran 的回答确实很棒。但就我的问题而言，我通过对所有元素进行 nil="true" (nullable=true) 来解决它。我使用 xsd 为我的请求 xml 生成类。

谢谢