从 XML 获取 C# 对象的通用列表工作正常，除非我把它放在对象列表中

Question

这是可行的：（每个发票都有很多行项目）

public class Invoice
{
    public int InvoiceId { get; set; }

    public List<LineItem> LineItems { get; set; }
}

public class LineItem
{
    public int LineItemId { get; set; }
}
string strInvoice = "<Invoice>   <InvoiceId>12345</InvoiceId>   <LineItems>      <LineItem>         <LineItemId>123</LineItemId>      </LineItem>      <LineItem>         <LineItemId>456</LineItemId>      </LineItem>   </LineItems></Invoice>";

object result = new System.Xml.Serialization.XmlSerializer(typeof(Invoice)).Deserialize(new System.IO.StringReader(strInvoice));

对象被完美反序列化。

但是现在，我尝试制作一个发票清单（我现在将当前 XML 字符串包含在 <Invoices></Invoices> 中）：

public class InvoiceList
{
    public List<Invoice> Invoices { get; set; }
}

string strInvoices = "<Invoices><Invoice>   <InvoiceId>12345</InvoiceId>   <LineItems>      <LineItem>         <LineItemId>123</LineItemId>      </LineItem>      <LineItem>         <LineItemId>456</LineItemId>      </LineItem>   </LineItems></Invoice></Invoices>";

object results = new System.Xml.Serialization.XmlSerializer(typeof(Invoice)).Deserialize(new System.IO.StringReader(strInvoices));

导致：

There is an error in XML document (1, 2).
{"<Invoices xmlns=''> was not expected."}

如何构造我的 class 或 SQL 以反序列化发票列表？

尝试这个 - 这是从标记为重复的 Twitter 问题的答案中获取的，我没有得到结果：

   string strInvoices = "<Invoices><Invoice>   <InvoiceId>12345</InvoiceId>   <LineItems>      <LineItem>         <LineItemId>123</LineItemId>      </LineItem>      <LineItem>         <LineItemId>456</LineItemId>      </LineItem>   </LineItems></Invoice></Invoices>";
    XmlRootAttribute xRoot = new XmlRootAttribute();
    xRoot.ElementName = "Invoices";
    xRoot.IsNullable = true;
    object results = new System.Xml.Serialization.XmlSerializer(typeof(Invoice),xRoot).Deserialize(new System.IO.StringReader(strInvoices));

如果我这样做，我会得到同样的错误：

object results = new System.Xml.Serialization.XmlSerializer(typeof(Invoice),xRoot).Deserialize(new System.IO.StringReader(strInvoices));

如果我按照评论中的建议执行此操作，则不会返回任何内容：

 object results = new System.Xml.Serialization.XmlSerializer(typeof(InvoiceList),xRoot).Deserialize(new System.IO.StringReader(strInvoices));

因此与标记为重复的示例不同我付出了很多努力来复制此错误，并使其尽可能通用且易于阅读并可复制并粘贴到 Visual Studio

Answer 1

您正在反序列化为错误的类型 - 您想要反序列化为 InvoiceList。

您还应该向 InvoiceList class 添加一些属性以正确映射元素名称：

[XmlRoot("Invoices")]
public class InvoiceList
{
    [XmlElement("Invoice")]
    public List<Invoice> Invoices { get; set; }
}

然后你应该能够像这样反序列化：

var serializer = new XmlSerializer(typeof(InvoiceList));

using (var reader = new StringReader(strInvoices))
{
    var list = (InvoiceList)serializer.Deserialize(reader);
}

有关工作示例，请参阅 https://dotnetfiddle.net/mBtPSP。

从 XML 获取 C# 对象的通用列表工作正常，除非我把它放在对象列表中

Getting Generic List of C# objects from XML working fine, except when I put that in a List of Objects

c#

xml

generic-list

xml-deserialization