XPathNavigator.NavigatorComparer プロパティ

定義

XPathNavigator オブジェクトの等価性を比較するために使用される IEqualityComparer を取得します。Gets an IEqualityComparer used for equality comparison of XPathNavigator objects.

public:
 static property System::Collections::IEqualityComparer ^ NavigatorComparer { System::Collections::IEqualityComparer ^ get(); };
public static System.Collections.IEqualityComparer NavigatorComparer { get; }
member this.NavigatorComparer : System.Collections.IEqualityComparer
Public Shared ReadOnly Property NavigatorComparer As IEqualityComparer

プロパティ値

XPathNavigator オブジェクトの等価性を比較するために使用される IEqualityComparerAn IEqualityComparer used for equality comparison of XPathNavigator objects.

次の例は、NavigatorComparer プロパティの使用方法を示しています。The following example illustrates the use of the NavigatorComparer property.

XPathDocument^ document = gcnew XPathDocument("books.xml");
XPathNavigator^ navigator = document->CreateNavigator();
Hashtable^ table = gcnew Hashtable(XPathNavigator::NavigatorComparer);

// Add nodes to the Hashtable.
for each (XPathNavigator^ navigator2 in navigator->Select("//book"))
{
    Object^ value = navigator2->Evaluate("string(./title)");
    table->Add(navigator2->Clone(), value);
    Console::WriteLine("Added book with title {0}", value);
}

Console::WriteLine(table->Count);
Console::WriteLine("Does the Hashtable have the book \"The Confidence Man\"?");
Console::WriteLine(table->Contains(navigator->SelectSingleNode("//book[title='The Confidence Man']")));
XPathDocument document = new XPathDocument("books.xml");
XPathNavigator navigator = document.CreateNavigator();
Hashtable table = new Hashtable(XPathNavigator.NavigatorComparer);

// Add nodes to the Hashtable.
foreach (XPathNavigator navigator2 in navigator.Select("//book"))
{
    object value = navigator2.Evaluate("string(./title)");
    table.Add(navigator2.Clone(), value);
    Console.WriteLine("Added book with title {0}", value);
}

Console.WriteLine(table.Count);
Console.WriteLine("Does the Hashtable have the book \"The Confidence Man\"?");
Console.WriteLine(table.Contains(navigator.SelectSingleNode("//book[title='The Confidence Man']")));
Dim document As XPathDocument = New XPathDocument("books.xml")
Dim navigator As XPathNavigator = document.CreateNavigator()
Dim table As Hashtable = New Hashtable(XPathNavigator.NavigatorComparer)

' Add nodes to the Hashtable.
For Each navigator2 As XPathNavigator In navigator.Select("//book")
    Dim value As Object = navigator2.Evaluate("string(./title)")
    table.Add(navigator2.Clone(), value)
    Console.WriteLine("Added book with title {0}", value)
Next

Console.WriteLine(table.Count)
Console.WriteLine("Does the Hashtable have the book 'The Confidence Man'?")
Console.WriteLine(table.Contains(navigator.SelectSingleNode("//book[title='The Confidence Man']")))

この例は、books.xml ファイルを入力として使用します。The example takes the books.xml file as an input.

  
<?xml version="1.0" encoding="utf-8" ?>   
<bookstore>  
    <book genre="autobiography" publicationdate="1981-03-22" ISBN="1-861003-11-0">  
        <title>The Autobiography of Benjamin Franklin</title>  
        <author>  
            <first-name>Benjamin</first-name>  
            <last-name>Franklin</last-name>  
        </author>  
        <price>8.99</price>  
    </book>  
    <book genre="novel" publicationdate="1967-11-17" ISBN="0-201-63361-2">  
        <title>The Confidence Man</title>  
        <author>  
            <first-name>Herman</first-name>  
            <last-name>Melville</last-name>  
        </author>  
        <price>11.99</price>  
    </book>  
    <book genre="philosophy" publicationdate="1991-02-15" ISBN="1-861001-57-6">  
        <title>The Gorgias</title>  
        <author>  
            <name>Plato</name>  
        </author>  
        <price>9.99</price>  
    </book>  
</bookstore>  
  

注釈

NavigatorComparer プロパティを使用すると、オブジェクトへの参照ではなく、位置の基準に基づいて XPathNavigator オブジェクトを比較できます。The NavigatorComparer property allows XPathNavigator objects to be compared on the basis of position rather than reference to the object. このクラスによって実装される ComparePosition および Equals メソッドは、パラメーターとして渡された XPathNavigator オブジェクトの位置に基づいています。The ComparePosition and Equals methods implemented by this class are based on the position of the XPathNavigator objects passed as parameters. このクラスによって実装される GetHashCode メソッドは、ノードのローカル名や名前空間 URI などのプロパティを使用して、ノードのハッシュコードを作成します。The GetHashCode method implemented by this class uses the properties of the node such as its local name and namespace URI to create a hash code for the node.

適用対象