从 Web api 反序列化 XML 数组

Question

首先，我按照 here 给出的答案进行操作，但我仍然无法使以下内容正常工作。

我正在从网络 API 中检索 XML，返回的结果是这样的：

<ArrayOf__ptd_student_charges
    xmlns="http://schemas.datacontract.org/2004/07/something.something"
    xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
    <__ptd_student_charges>
        <accumulated_tuition>000.000</accumulated_tuition>
        <course_id>AAA-000/L</course_id>
        <invoice_date>01/01/2015</invoice_date>
        <lecturer_name>John Doe</lecturer_name>
        <net_tuition>000.000</net_tuition>
        <section_no>1</section_no>
        <semester>Summer</semester>
        <student_id>123456</student_id>
        <student_name>John Doe</student_name>
        <year>2015</year>
    </__ptd_student_charges>
    <__ptd_student_charges>
        <accumulated_tuition>000.000</accumulated_tuition>
        <course_id>AAA-000/L</course_id>
        <invoice_date>01/01/2015</invoice_date>
        <lecturer_name>John Doe</lecturer_name>
        <net_tuition>000.000</net_tuition>
        <section_no>1</section_no>
        <semester>Summer</semester>
        <student_id>123456</student_id>
        <student_name>John Doe</student_name>
        <year>2015</year>
    </__ptd_student_charges>  
</ArrayOf__ptd_student_charges>

我正在尝试将其反序列化为一组学生。我的学生 class 是这样定义的：

public class Student
{
    [System.Xml.Serialization.XmlElement("accumulated_tuiton")]
    public double AccumulatedTution { get; set; }

    [System.Xml.Serialization.XmlElement("net_tuiton")]
    public double NetTuiton { get; set; }

    [System.Xml.Serialization.XmlElement("course_id")]
    public string CourseID { get; set; }

    [System.Xml.Serialization.XmlElement("invoice_date")]
    public DateTime InvoiceDate { get; set; }

    [System.Xml.Serialization.XmlElement("lecturer_name")]
    public string LecturerName { get; set; }

    [System.Xml.Serialization.XmlElement("semester")]
    public string Semester { get; set; }

    [System.Xml.Serialization.XmlElement("student_id")]
    public string StudentId { get; set; }

    [System.Xml.Serialization.XmlElement("student_name")]
    public string StudentName { get; set; }

    [System.Xml.Serialization.XmlElement("year")]
    public string Year { get; set; }

    [System.Xml.Serialization.XmlElement("section_no")]
    public int Section { get; set; }
}

而我的学生collection是这样定义的：

[System.Xml.Serialization.XmlRoot("ArrayOf__ptd_student_charges xmlns=\"http://schemas.datacontract.org/2004/07/something.something\" xmlns:i=\"http://www.w3.org/2001/XMLSchema-instance")]
public class StudentCollection
{
    [XmlArray("ArrayOf__ptd_student_charges")]
    [XmlArrayItem("__ptd_student_charges", typeof(Student))]
    public Student[] StudentArray { get; set; }
}

我正在使用以下代码反序列化结果：

private void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
    StudentCollection collection;

    HttpWebRequest request = WebRequest.Create(stringUrl) as HttpWebRequest;
    HttpWebResponse response = request.GetResponse() as HttpWebResponse;

    XmlTextReader reader = new XmlTextReader(response.GetResponseStream());

    XmlSerializer serializer = new XmlSerializer(typeof(StudentCollection));
    collection = (StudentCollection)serializer.Deserialize(reader);

    reader.Close();
}

一旦我运行这个，我就收到 InvalidOperationException 一条消息

ArrayOf__ptd_student_charges xmlns='http://schemas.datacontract.org/2004/07/something.something'> was not expected.

我知道 xmlns:... 不应该在第一个标记中，但不幸的是，我不确定如何继续。

Answer 1

基本上，您需要在 XML 文件中支持默认的 XML 命名空间 - 您可以或者通过在 StudentCollection 上指定它来做到这一点：

[System.Xml.Serialization.XmlRoot("ArrayOf__ptd_student_charges")]
[System.Xml.Serialization.XmlRootAttribute(Namespace = "http://schemas.datacontract.org/2004/07/something.something", IsNullable = false)]
public class StudentCollection
{
    [XmlArray("ArrayOf__ptd_student_charges")]
    [XmlArrayItem("__ptd_student_charges", typeof(Student))]
    public Student[] StudentArray { get; set; }
}

和实际的Student class:

[System.Xml.Serialization.XmlRootAttribute(Namespace = "http://schemas.datacontract.org/2004/07/something.something", IsNullable = false)]
public class Student
{
   ..........
}

或你可以在反序列化时以编程方式指定它：

XmlSerializer serializer = new XmlSerializer(typeof(StudentCollection),
                                             "http://schemas.datacontract.org/2004/07/something.something");

XmlSerializer 的第二个参数是反序列化 XML 内容时使用的 default XML 命名空间。

额外提示： 如果您再次拥有一个 XML 文件，并且您需要获取代表该文件的 C# 代码 classes XML - 如果你有 Visual Studio 2012 或更新版本，只需创建一个新代码 class，将你的 XML 文件复制到剪贴板，然后使用 Edit > Paste Special > Paste XML as classes 即可您所有的 C#，包括所有 XML 属性和 XML 名称空间以及粘贴到 Visual Studio 中的所有内容

从 Web api 反序列化 XML 数组

Deserializing an XML array from a web api

c#

xml

xml-deserialization