XPathNavigator.ValueAsBoolean XPathNavigator.ValueAsBoolean XPathNavigator.ValueAsBoolean XPathNavigator.ValueAsBoolean Property

定義

現在のノードの値を Boolean として取得します。Gets the current node's value as a Boolean.

public:
 virtual property bool ValueAsBoolean { bool get(); };
public override bool ValueAsBoolean { get; }
member this.ValueAsBoolean : bool
Public Overrides ReadOnly Property ValueAsBoolean As Boolean

プロパティ値

現在のノードの Boolean としての値。The current node's value as a Boolean.

例外

現在のノードの文字列値を、Boolean に変換することはできません。The current node's string value cannot be converted to a Boolean.

試行された Boolean へのキャストは無効です。The attempted cast to Boolean is not valid.

次の例では、 valueas.xml 、、 ValueAsDoubleValueAsInt、およびValueAsLongの各プロパティValueAsBooleanを使用してValueAsDateTime、ファイル内の各要素の値が返されます。In the following example, the value of each element in the valueas.xml file is returned using the ValueAsBoolean, ValueAsDateTime, ValueAsDouble, ValueAsInt, and ValueAsLong properties.

XPathDocument^ document = gcnew XPathDocument("valueas.xml");
XPathNavigator^ navigator = document->CreateNavigator();

// ValueAsBoolean
navigator->MoveToChild("root", "");
navigator->MoveToChild("booleanElement", "");
bool^ booleanValue = navigator->ValueAsBoolean;
Console::WriteLine(navigator->LocalName + ": " + booleanValue);

// ValueAsDateTime
navigator->MoveToNext("dateTimeElement", "");
DateTime^ dateTimeValue = navigator->ValueAsDateTime;
Console::WriteLine(navigator->LocalName + ": " + dateTimeValue);

// ValueAsDouble, ValueAsInt32, ValueAsInt64, ValueAsSingle
navigator->MoveToNext("numberElement", "");
Double doubleValue = navigator->ValueAsDouble;
Int32 int32Value = navigator->ValueAsInt;
Int64 int64Value = navigator->ValueAsLong;
Console::WriteLine(navigator->LocalName + ": " + doubleValue);
Console::WriteLine(navigator->LocalName + ": " + int32Value);
Console::WriteLine(navigator->LocalName + ": " + int64Value);
XPathDocument document = new XPathDocument("valueas.xml");
XPathNavigator navigator = document.CreateNavigator();

// ValueAsBoolean
navigator.MoveToChild("root", "");
navigator.MoveToChild("booleanElement", "");
bool booleanValue = navigator.ValueAsBoolean;
Console.WriteLine(navigator.LocalName + ": " + booleanValue);

// ValueAsDateTime
navigator.MoveToNext("dateTimeElement", "");
DateTime dateTimeValue = navigator.ValueAsDateTime;
Console.WriteLine(navigator.LocalName + ": " + dateTimeValue);

// ValueAsDouble, ValueAsInt32, ValueAsInt64, ValueAsSingle
navigator.MoveToNext("numberElement", "");
Double doubleValue = navigator.ValueAsDouble;
Int32 int32Value = navigator.ValueAsInt;
Int64 int64Value = navigator.ValueAsLong;
Console.WriteLine(navigator.LocalName + ": " + doubleValue);
Console.WriteLine(navigator.LocalName + ": " + int32Value);
Console.WriteLine(navigator.LocalName + ": " + int64Value);
Dim document As XPathDocument = New XPathDocument("valueas.xml")
Dim navigator As XPathNavigator = document.CreateNavigator()

' ValueAsBoolean
navigator.MoveToChild("root", "")
navigator.MoveToChild("booleanElement", "")
Dim booleanValue As Boolean = navigator.ValueAsBoolean
Console.WriteLine(navigator.LocalName + ": " + booleanValue)

' ValueAsDateTime
navigator.MoveToNext("dateTimeElement", "")
Dim dateTimeValue As DateTime = navigator.ValueAsDateTime
Console.WriteLine(navigator.LocalName + ": " + dateTimeValue)

' ValueAsDouble, ValueAsInt32, ValueAsInt64, ValueAsSingle
navigator.MoveToNext("numberElement", "")
Dim doubleValue As Double = navigator.ValueAsDouble
Dim int32Value As Int32 = navigator.ValueAsInt
Dim int64Value As Int64 = navigator.ValueAsLong
Console.WriteLine(navigator.LocalName + ": " + doubleValue)
Console.WriteLine(navigator.LocalName + ": " + int32Value)
Console.WriteLine(navigator.LocalName + ": " + int64Value)

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

<root>  
    <booleanElement>true</booleanElement>  
    <dateTimeElement>2004-04-20T12:00:00</dateTimeElement>  
    <decimalElement>10.00</decimalElement>  
    <numberElement>100000000</numberElement>  
</root>  

注釈

xs:boolean XmlDocument XmlReaderにスキーマまたは型情報 (たとえば、xml スキーマ検証で初期化ValueAsBooleanされたオブジェクト)がある場合、および現在のノードがxmlスキーマ型として定義されている場合は、プロパティXPathNavigator現在のノードの値をボックス化解除Booleanされたオブジェクトとして返します。If the XPathNavigator has schema or type information (for example, from an XmlDocument object initialized with an XML schema validating XmlReader), and if the current node is defined as an XML Schema xs:boolean type, the ValueAsBoolean property returns the current node's value as an unboxed Boolean object.

ただし、にスキーマXPathNavigatorまたは型の情報がない場合、プロパティValueAsBooleanは、のxs:booleanXPath 2.0 キャスト規則に従って、現在のBooleanノードの文字列値を値に変換しようとします。However, if the XPathNavigator does not have any schema or type information, the ValueAsBoolean property attempts to convert the string value of the current node to a Boolean value, according to the XPath 2.0 casting rules for xs:boolean.

適用対象