從XML獲取C＃對象的通用列表工作正常，除非我將其放在對象列表中

Question

這是可行的：（每個發票都有很多LineItem）

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));

對象完美反序列化。

但是現在，我嘗試制作一個發票清單（我現在將當前XML字符串括在<Invoices></Invoices> ）：

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));

導致：

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

如何構造我的類或SQL以反序列化發票清單？

嘗試此操作-從被標記為重復的Twitter問題的答案中獲取的，我沒有任何結果：

   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));

如果我這樣做，我會得到相同的錯誤：

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

如果按照注釋建議執行此操作，則不會返回任何內容：

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

因此，它與標記為重復的示例不同，我已經花了很多力氣來復制此錯誤，並使其盡可能通用且易於讀取和復制並粘貼到Visual Studio中。

Answer 1

您將反序列化為錯誤的類型-您想反序列InvoiceList 。

您還應該在InvoiceList類中添加一些屬性，以正確映射元素名稱：

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

然后您應該可以像這樣反序列化：

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

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

有關工作示例，請參閱https://dotnetfiddle.net/mBtPSP 。