XmlDocument 构造函数
定义
初始化 XmlDocument 类的新实例。Initializes a new instance of the XmlDocument class.
重载
| XmlDocument() |
初始化 XmlDocument 类的新实例。Initializes a new instance of the XmlDocument class. |
| XmlDocument(XmlImplementation) |
使用指定的 |
| XmlDocument(XmlNameTable) |
使用指定的 |
XmlDocument()
初始化 XmlDocument 类的新实例。Initializes a new instance of the XmlDocument class.
public:
XmlDocument();
public XmlDocument ();
Public Sub New ()
示例
下面是加载时间验证的示例。The following is an example of load-time validation. 文档类型定义 (DTD) 验证 XmlReader 传递给 Load 方法,并 ValidationEventHandler 提供以通知用户任何验证错误。A document type definition (DTD) validating XmlReader is passed to the Load method and a ValidationEventHandler is provided to notify users of any validation errors. 在此示例中,发现了一个验证错误,但仍加载了该文档。In this example a validation error is found, but the document is still loaded. 或者,您可以定义一个验证 XmlReader 以引发异常,并在通过不指定的情况下发现验证错误来停止加载进程 ValidationEventHandler 。Alternatively, you can define a validating XmlReader to throw an exception and stop the load process when a validation error is found by not specifying the ValidationEventHandler. 有关验证 XML 数据的详细信息,请参阅 XmlReader 引用页的“备注”部分。For more information about validating XML data, see the Remarks section of the XmlReader reference page.
#using <System.Xml.dll>
using namespace System;
using namespace System::Xml;
using namespace System::Xml::Schema;
ref class XmlDocumentSample
{
private:
static XmlReader^ reader;
static String^ filename = "bookdtd.xml";
// Display the validation error.
static void ValidationCallback(Object^ sender, ValidationEventArgs^ args)
{
Console::WriteLine("Validation error loading: {0}", filename);
Console::WriteLine(args->Message);
}
public:
static void Main()
{
ValidationEventHandler^ eventHandler = gcnew ValidationEventHandler(XmlDocumentSample::ValidationCallback);
try
{
// Create the validating reader and specify DTD validation.
XmlReaderSettings^ settings = gcnew XmlReaderSettings();
settings->DtdProcessing = DtdProcessing::Parse;
settings->ValidationType = ValidationType::DTD;
settings->ValidationEventHandler += eventHandler;
reader = XmlReader::Create(filename, settings);
// Pass the validating reader to the XML document.
// Validation fails due to an undefined attribute, but the
// data is still loaded into the document.
XmlDocument^ doc = gcnew XmlDocument();
doc->Load(reader);
Console::WriteLine(doc->OuterXml);
}
finally
{
if (reader != nullptr)
reader->Close();
}
}
};
int main()
{
XmlDocumentSample::Main();
return 0;
}
using System;
using System.Xml;
using System.Xml.Schema;
namespace Microsoft.Samples.Xml
{
sealed class XmlDocumentSample
{
private XmlDocumentSample() { }
static XmlReader reader;
static String filename = "bookdtd.xml";
public static void Main()
{
ValidationEventHandler eventHandler = new ValidationEventHandler(XmlDocumentSample.ValidationCallback);
try
{
// Create the validating reader and specify DTD validation.
XmlReaderSettings settings = new XmlReaderSettings();
settings.DtdProcessing = DtdProcessing.Parse;
settings.ValidationType = ValidationType.DTD;
settings.ValidationEventHandler += eventHandler;
reader = XmlReader.Create(filename, settings);
// Pass the validating reader to the XML document.
// Validation fails due to an undefined attribute, but the
// data is still loaded into the document.
XmlDocument doc = new XmlDocument();
doc.Load(reader);
Console.WriteLine(doc.OuterXml);
}
finally
{
if (reader != null)
reader.Close();
}
}
// Display the validation error.
private static void ValidationCallback(object sender, ValidationEventArgs args)
{
Console.WriteLine("Validation error loading: {0}", filename);
Console.WriteLine(args.Message);
}
}
}
Option Explicit On
Option Strict On
Imports System.Xml
Imports System.Xml.Schema
Namespace Microsoft.Samples.Xml
NotInheritable Class XmlDocumentSample
Private Sub New()
End Sub
Shared reader As XmlReader
Shared filename As String = "bookdtd.xml"
Public Shared Sub Main()
Dim eventHandler As New ValidationEventHandler(AddressOf XmlDocumentSample.ValidationCallback)
Try
' Create the validating reader and specify DTD validation.
Dim settings As New XmlReaderSettings()
settings.DtdProcessing = DtdProcessing.Parse
settings.ValidationType = ValidationType.DTD
AddHandler settings.ValidationEventHandler, eventHandler
reader = XmlReader.Create(filename, settings)
' Pass the validating reader to the XML document.
' Validation fails due to an undefined attribute, but the
' data is still loaded into the document.
Dim doc As New XmlDocument()
doc.Load(reader)
Console.WriteLine(doc.OuterXml)
Finally
If Not (reader Is Nothing) Then
reader.Close()
End If
End Try
End Sub
' Display the validation error.
Private Shared Sub ValidationCallback(ByVal sender As Object, ByVal args As ValidationEventArgs)
Console.WriteLine("Validation error loading: {0}", filename)
Console.WriteLine(args.Message)
End Sub
End Class
End Namespace
示例使用 bookDTD.xml 文件作为输入。The example uses the bookDTD.xml file as input.
<!DOCTYPE bookstore [
<!ELEMENT bookstore (book)*>
<!ELEMENT book (title,author,price)>
<!ATTLIST book genre CDATA #REQUIRED>
<!ELEMENT title (#PCDATA)>
<!ELEMENT author (#PCDATA)>
<!ELEMENT price (#PCDATA)>]>
<bookstore>
<book genre="fantasy" ISBN="2-3631-4">
<title>Oberon's Legacy</title>
<author>Corets, Eva</author>
<price>5.95</price>
</book>
</bookstore>
另请参阅
适用于
XmlDocument(XmlImplementation)
使用指定的 XmlDocument 初始化 XmlImplementation 类的新实例。Initializes a new instance of the XmlDocument class with the specified XmlImplementation.
protected public:
XmlDocument(System::Xml::XmlImplementation ^ imp);
protected internal XmlDocument (System.Xml.XmlImplementation imp);
new System.Xml.XmlDocument : System.Xml.XmlImplementation -> System.Xml.XmlDocument
Protected Friend Sub New (imp As XmlImplementation)
参数
要使用的 XmlImplementation。The XmlImplementation to use.
适用于
XmlDocument(XmlNameTable)
使用指定的 XmlDocument 初始化 XmlNameTable 类的新实例。Initializes a new instance of the XmlDocument class with the specified XmlNameTable.
public:
XmlDocument(System::Xml::XmlNameTable ^ nt);
public XmlDocument (System.Xml.XmlNameTable nt);
new System.Xml.XmlDocument : System.Xml.XmlNameTable -> System.Xml.XmlDocument
Public Sub New (nt As XmlNameTable)
参数
- nt
- XmlNameTable
要使用的 XmlNameTable。The XmlNameTable to use.