好吧，我在学习一些教程时遇到了学习 XmlSerializer 的障碍。我已按照所有建议的步骤进行操作，但我的程序没有返回任何内容，或者返回的是空值。我创建了一个 XML 文件，如下所示:

<?xml version='1.0' encoding='UTF-8' ?>
<WeeklyJobs>
   <DailyJobs Date = "02/03/2012"/>
  <DailyJobs Date = "02/04/2012" TotalJobs = "2">
    <Jobs>
      <Job JobName = "Job Name" Description = "Description"/>
      <Job JobName = "Job Name" Description = "Description"/>
    </Jobs>
  </DailyJobs>
  <DailyJobs Date = "02/05/2012" TotalJobs = "1">
    <Jobs>
      <Job JobName = "Job Name" Description = "Description"/>
    </Jobs>
  </DailyJobs>
  <DailyJobs Date = "02/06/2012" TotalJobs = "2">
    <Jobs>
      <Job JobName = "Job Name" Description = "Description"/>
      <Job JobName = "Job Name" Description = "Description"/>
    </Jobs>
  </DailyJobs>
  <DailyJobs Date = "02/07/2012"/>
  <DailyJobs Date = "02/08/2012" TotalJobs = "2">
    <Jobs>
      <Job JobName = "Job Name" Description = "Description"/>
      <Job JobName = "Job Name" Description = "Description"/>
    </Jobs>
  </DailyJobs>
</WeeklyJobs>

然后我使用 xsd.exe 生成 .xsd 文件，它是:

<?xml version="1.0" encoding="utf-8"?>
<xs:schema id="WeeklyJobs" xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema"     xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
  <xs:element name="WeeklyJobs" msdata:IsDataSet="true" msdata:UseCurrentLocale="true">
    <xs:complexType>
      <xs:choice minOccurs="0" maxOccurs="unbounded">
        <xs:element name="DailyJobs">
          <xs:complexType>
            <xs:sequence>
              <xs:element name="Jobs" minOccurs="0" maxOccurs="unbounded">
                <xs:complexType>
                  <xs:sequence>
                    <xs:element name="Job" minOccurs="0" maxOccurs="unbounded">
                      <xs:complexType>
                        <xs:attribute name="JobName" type="xs:string" />
                        <xs:attribute name="Description" type="xs:string" />
                      </xs:complexType>
                    </xs:element>
                  </xs:sequence>
                </xs:complexType>
              </xs:element>
            </xs:sequence>
            <xs:attribute name="Date" type="xs:string" />
            <xs:attribute name="TotalJobs" type="xs:string" />
          </xs:complexType>
        </xs:element>
      </xs:choice>
    </xs:complexType>
  </xs:element>
</xs:schema>

创建模式后，我再次使用 xsd.exe 为我自动生成类:

/// <remarks/>
[System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "2.0.50727.3038")]
[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 WeeklyJobs
{

    private WeeklyJobsDailyJobs[] itemsField;

    /// <remarks/>
    [System.Xml.Serialization.XmlElementAttribute("DailyJobs", Form = System.Xml.Schema.XmlSchemaForm.Unqualified)]
    public WeeklyJobsDailyJobs[] Items
    {
        get
        {
            return this.itemsField;
        }
        set
        {
            this.itemsField = value;
        }
    }
}

/// <remarks/>
[System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "2.0.50727.3038")]
[System.SerializableAttribute()]
[System.Diagnostics.DebuggerStepThroughAttribute()]
[System.ComponentModel.DesignerCategoryAttribute("code")]
[System.Xml.Serialization.XmlTypeAttribute(AnonymousType = true)]
public partial class WeeklyJobsDailyJobs
{

    private WeeklyJobsDailyJobsJobsJob[][] jobsField;

    private string dateField;

    private string totalJobsField;

    /// <remarks/>
    [System.Xml.Serialization.XmlArrayAttribute(Form = System.Xml.Schema.XmlSchemaForm.Unqualified)]
    [System.Xml.Serialization.XmlArrayItemAttribute("Job", typeof(WeeklyJobsDailyJobsJobsJob), Form = System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable = false)]
    public WeeklyJobsDailyJobsJobsJob[][] Jobs
    {
        get
        {
            return this.jobsField;
        }
        set
        {
            this.jobsField = value;
        }
    }

    /// <remarks/>
    [System.Xml.Serialization.XmlAttributeAttribute()]
    public string Date
    {
        get
        {
            return this.dateField;
        }
        set
        {
            this.dateField = value;
        }
    }

    /// <remarks/>
    [System.Xml.Serialization.XmlAttributeAttribute()]
    public string TotalJobs
    {
        get
        {
            return this.totalJobsField;
        }
        set
        {
            this.totalJobsField = value;
        }
    }
}

/// <remarks/>
[System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "2.0.50727.3038")]
[System.SerializableAttribute()]
[System.Diagnostics.DebuggerStepThroughAttribute()]
[System.ComponentModel.DesignerCategoryAttribute("code")]
[System.Xml.Serialization.XmlTypeAttribute(AnonymousType = true)]
public partial class WeeklyJobsDailyJobsJobsJob
{

    private string jobNameField;

    private string descriptionField;

    /// <remarks/>
    [System.Xml.Serialization.XmlAttributeAttribute()]
    public string JobName
    {
        get
        {
            return this.jobNameField;
        }
        set
        {
            this.jobNameField = value;
        }
    }

    /// <remarks/>
    [System.Xml.Serialization.XmlAttributeAttribute()]
    public string Description
    {
        get
        {
            return this.descriptionField;
        }
        set
        {
            this.descriptionField = value;
        }
    }
}

在此之后，我将 .CS 文件添加到我的项目中，并创建了一个带有文本框的简单 winform，以便在反序列化一些 xml 后显示一些数据。就像我说的那样，程序启动了，TextBox 中没有显示任何内容，也没有抛出任何异常。这是我的 winform:

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();

    }

    public string getExample()
    {
        XmlSerializer serializer = new XmlSerializer(typeof(WeeklyJobs));
        WeeklyJobs jobs;
        string xml = @"<?xml version = ""1.0""?>"
            + @"<WeeklyJobs>"
            + @"<DailyJobs Date = ""02/03/2012""/>"
            + @"<DailyJobs Date = ""02/04/2012"" TotalJobs = ""2"">"
            + @"<Jobs>"
            + @"<Job JobName = ""Job Name"" Description = ""Description""/>"
            + @"<Job JobName = ""Job Name"" Description = ""Description""/>"
            + @"</Jobs>"
            + @"</DailyJobs>"
            + @"</WeeklyJobs>";

        // Create an XmlTextReader
        using (XmlReader reader = XmlReader.Create(new StringReader(xml)))
        {
            jobs = (WeeklyJobs)serializer.Deserialize(reader);
        }

        return jobs.Items[0].Date;

    }

    private void Form1_Load(object sender, EventArgs e)
    {
        textBox1.Text = getExample();

    }


}

我有更多简单的 xml 示例可以使用，但我第二次尝试向我的 xml 添加一些复杂性时失败了。我必须弄清楚如何使用我这里的 xml。感谢您的帮助!谢谢大家!

最佳答案

好的，第一个问题是 XmlSerializer 构造函数引发了一个未处理的异常，但它不知何故被吞没了。这解释了文本框为空的原因。我将调试器设置为中断所有 CLR 异常，并发现构造函数抛出 InvalidOperationException——显然是在代码生成过程中:

Unable to generate a temporary class (result=1).

error CS0030: Cannot convert type 'DeleteMe.WeeklyJobsDailyJobsJobsJob[]' to 'DeleteMe.WeeklyJobsDailyJobsJobsJob'

error CS0029: Cannot implicitly convert type 'DeleteMe.WeeklyJobsDailyJobsJobsJob' to 'DeleteMe.WeeklyJobsDailyJobsJobsJob[]'

(构造函数也抛出 FileNotFound 异常，但它也处理了该异常，因此您可以忽略它。)

问题似乎出在交错数组上——您是否将一维数组更改为交错数组？当然，错误消息将我指向那个方向，但我也从未在 xsd 生成的代码中看到锯齿状数组，因此它看起来很可疑。我将两次出现的 WeeklyJobsDailyJobsJobsJob[][] 更改为 WeeklyJobsDailyJobsJobsJob[]，应用程序运行正常。

顺便说一句，您应该为日期使用 DateTime，但 XML 序列化程序不支持可变日期格式(请参阅 https://stackoverflow.com/a/1118855/385844)。如果您无法控制源，您最好先将字符串转换为日期，然后再将它们存储在数据库或任何地方。

关于c# - 使用 XmlReader 和 xsd.exe 中的类反序列化 Xml，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/24069094/