HOW TO：使用結構描述對應讀取具型別資料

更新： November 2007

下列範例使用 XmlReader 來傳回具型別物件。因為 hire-date 項目的格式，它無法成功轉換為 DateTime 物件。不過，如果您使用結構描述將項目對應至 xs:date 型別，則可執行必要的型別轉換。

範例

下列範例使用 ReadElementContentAsDateTime 方法，來傳回 hire-date 項目做為 DateTime 物件。

' Create a validating XmlReader object. The schema 
' provides the necessary type information.
Dim settings As XmlReaderSettings = New XmlReaderSettings()
settings.ValidationType = ValidationType.Schema
settings.Schemas.Add("urn:empl-hire", "hireDate.xsd")
Using reader As XmlReader = XmlReader.Create("hireDate.xml", settings) 
  ' Move to the hire-date element.
  reader.MoveToContent()
  reader.ReadToDescendant("hire-date")

  ' Return the hire-date as a DateTime object.
  Dim hireDate As DateTime = reader.ReadElementContentAsDateTime()
  Console.WriteLine("Six Month Review Date: {0}", hireDate.AddMonths(6))
End Using

// Create a validating XmlReader object. The schema 
// provides the necessary type information.
XmlReaderSettings settings = new XmlReaderSettings();
settings.ValidationType = ValidationType.Schema;
settings.Schemas.Add("urn:empl-hire", "hireDate.xsd");
using (XmlReader reader = XmlReader.Create("hireDate.xml", settings)) {

  // Move to the hire-date element.
  reader.MoveToContent();
  reader.ReadToDescendant("hire-date");

  // Return the hire-date as a DateTime object.
  DateTime hireDate = reader.ReadElementContentAsDateTime();
  Console.WriteLine("Six Month Review Date: {0}", hireDate.AddMonths(6));
}

輸入

該範例使用 hireDate.xml 及 hireDate.xsd 檔案做為輸入。

hireDate.xml

<employee xmlns="urn:empl-hire">
    <ID>12365</ID>
    <hire-date>2003-01-08</hire-date>
    <title>Accountant</title>
</employee>

hireDate.xsd

<?xml version="1.0"?>
<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="urn:empl-hire" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="employee">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="ID" type="xs:unsignedShort" />
        <xs:element name="hire-date" type="xs:date" />
        <xs:element name="title" type="xs:string" />
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>

輸出

Six Month Review Date:  7/8/2003 12:00:00 AM

請參閱

概念

使用 XmlReader 讀取 XML

讀取具型別的資料