XPathNavigator.MoveToNext 方法

参考

定义

命名空间:: System.Xml.XPath

程序集:: System.Xml.ReaderWriter.dll

程序集:: System.Xml.XPath.dll

程序集:: System.Xml.dll

程序集:: netstandard.dll

重要

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将 XPathNavigator 移至当前节点的下一个同级节点。

重载

MoveToNext()	当在派生类中被重写时，将 XPathNavigator 移动到当前节点的下一个同级节点。
MoveToNext(XPathNodeType)	将 XPathNavigator 移动到当前节点中与指定的 XPathNodeType 匹配的下一个同级节点。
MoveToNext(String, String)	将 XPathNavigator 移动到下一个具有指定的本地名称和命名空间 URI 的同级节点。

MoveToNext()

Source:: XPathNavigator.cs

Source:: XPathNavigator.cs

Source:: XPathNavigator.cs

当在派生类中被重写时，将 XPathNavigator 移动到当前节点的下一个同级节点。

public:
 abstract bool MoveToNext();

public abstract bool MoveToNext ();

abstract member MoveToNext : unit -> bool

Public MustOverride Function MoveToNext () As Boolean

Boolean

如果 XPathNavigator 成功地移动到下一个同级节点，则为 true；如果没有更多同级节点或如果 XPathNavigator 当前位于属性节点上，则为 false。如果为 false，则 XPathNavigator 的位置不变。

示例

以下示例以递归方式循环访问节点树，并显示有关元素和文本节点的信息。

static void XPathNavigatorMethods_MoveToNext()
{
    
    XPathDocument^ document = gcnew XPathDocument("books.xml");
    XPathNavigator^ navigator = document->CreateNavigator();
    XPathNodeIterator^ nodeset = navigator->Select("descendant::book[author/last-name='Melville']");

    while (nodeset->MoveNext())
    {
        // Clone iterator here when working with it.
        RecursiveWalk(nodeset->Current->Clone());
    }
}

static void RecursiveWalk(XPathNavigator^ navigator)
{
    switch (navigator->NodeType)
    {
    case XPathNodeType::Element:
        if (navigator->Prefix == String::Empty)
                Console::WriteLine("<{0}>", navigator->LocalName);
            else
        Console::Write("<{0}:{1}>", navigator->Prefix, navigator->LocalName);
                Console::WriteLine("\t" + navigator->NamespaceURI);
            break;
    case XPathNodeType::Text:
            Console::WriteLine("\t" + navigator->Value);
            break;
    }

    if (navigator->MoveToFirstChild())
    {
        do
        {
            RecursiveWalk(navigator);
        } while (navigator->MoveToNext());

        navigator->MoveToParent();
        if (navigator->NodeType == XPathNodeType::Element)
            Console::WriteLine("</{0}>", navigator->Name);
    }
    else
    {
        if (navigator->NodeType == XPathNodeType::Element)
        {
            Console::WriteLine("</{0}>", navigator->Name);
       }
    }
}

static void XPathNavigatorMethods_MoveToNext()
{

    XPathDocument document = new XPathDocument("books.xml");
    XPathNavigator navigator = document.CreateNavigator();
    XPathNodeIterator nodeset = navigator.Select("descendant::book[author/last-name='Melville']");

    while (nodeset.MoveNext())
    {
        // Clone iterator here when working with it.
        RecursiveWalk(nodeset.Current.Clone());
    }
}

public static void RecursiveWalk(XPathNavigator navigator)
{
    switch (navigator.NodeType)
    {
        case XPathNodeType.Element:
            if (string.IsNullOrEmpty(navigator.Prefix))
                Console.WriteLine("<{0}>", navigator.LocalName);
            else
                Console.Write("<{0}:{1}>", navigator.Prefix, navigator.LocalName);
            Console.WriteLine("\t" + navigator.NamespaceURI);
            break;
        case XPathNodeType.Text:
            Console.WriteLine("\t" + navigator.Value);
            break;
    }

    if (navigator.MoveToFirstChild())
    {
        do
        {
            RecursiveWalk(navigator);
        } while (navigator.MoveToNext());

        navigator.MoveToParent();
        if (navigator.NodeType == XPathNodeType.Element)
            Console.WriteLine("</{0}>", navigator.Name);
    }
    else
    {
        if (navigator.NodeType == XPathNodeType.Element)
        {
            Console.WriteLine("</{0}>", navigator.Name);
        }
    }
}

Shared Sub XPathNavigatorMethods_MoveToNext()

    Dim document As XPathDocument = New XPathDocument("books.xml")
    Dim navigator As XPathNavigator = document.CreateNavigator()
    Dim nodeset As XPathNodeIterator = navigator.Select("descendant::book[author/last-name='Melville']")

    While nodeset.MoveNext()
        ' Clone iterator here when working with it.
        RecursiveWalk(nodeset.Current.Clone())
    End While

End Sub

Shared Sub RecursiveWalk(ByVal navigator As XPathNavigator)

    Select Case navigator.NodeType
        Case XPathNodeType.Element
            If navigator.Prefix = String.Empty Then
                Console.WriteLine("<{0}>", navigator.LocalName)
            Else
                Console.Write("<{0}:{1}>", navigator.Prefix, navigator.LocalName)
                Console.WriteLine(vbTab + navigator.NamespaceURI)
            End If
        Case XPathNodeType.Text
            Console.WriteLine(vbTab + navigator.Value)
    End Select

    If navigator.MoveToFirstChild() Then
        Do
            RecursiveWalk(navigator)
        Loop While (navigator.MoveToNext())

        navigator.MoveToParent()
        If (navigator.NodeType = XPathNodeType.Element) Then
            Console.WriteLine("</{0}>", navigator.Name)
        End If
    Else
        If navigator.NodeType = XPathNodeType.Element Then
            Console.WriteLine("</{0}>", navigator.Name)
        End If
    End If

End Sub

该示例使用 books.xml 文件作为输入。

<?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>

另请参阅

适用于

MoveToNext(XPathNodeType)

Source:: XPathNavigator.cs

Source:: XPathNavigator.cs

Source:: XPathNavigator.cs

将 XPathNavigator 移动到当前节点中与指定的 XPathNodeType 匹配的下一个同级节点。

public:
 virtual bool MoveToNext(System::Xml::XPath::XPathNodeType type);

public virtual bool MoveToNext (System.Xml.XPath.XPathNodeType type);

abstract member MoveToNext : System.Xml.XPath.XPathNodeType -> bool
override this.MoveToNext : System.Xml.XPath.XPathNodeType -> bool

Public Overridable Function MoveToNext (type As XPathNodeType) As Boolean

参数

type: XPathNodeType

要移动到的同级节点的 XPathNodeType。

Boolean

注解

方法的 MoveToNext 返回值取决于 XPathNodeType 当前节点的和 XPathNodeType 要移动到的下一个同级节点的。

下表显示了可移动到的不同 XPathNodeType 节点和同级节点。

当前节点的 XPathNodeType	同级节点的 XPathNodeType
Element	Element、ProcessingInstruction、Comment 或 Text。
Text	Element、ProcessingInstruction、Comment 或 Text。
ProcessingInstruction	Element、ProcessingInstruction、Comment 或 Text。
Comment	Element、ProcessingInstruction、Comment 或 Text。
所有其他 XPathNodeType 值	无。

适用于

MoveToNext(String, String)

Source:: XPathNavigator.cs

Source:: XPathNavigator.cs

Source:: XPathNavigator.cs

将 XPathNavigator 移动到下一个具有指定的本地名称和命名空间 URI 的同级节点。

public:
 virtual bool MoveToNext(System::String ^ localName, System::String ^ namespaceURI);

public virtual bool MoveToNext (string localName, string namespaceURI);

abstract member MoveToNext : string * string -> bool
override this.MoveToNext : string * string -> bool

Public Overridable Function MoveToNext (localName As String, namespaceURI As String) As Boolean

参数

localName: String

要移动到的下一个同级节点的本地名称。

namespaceURI: String

要移动到的下一个同级节点的命名空间 URI。

Boolean

如果 XPathNavigator 成功地移动到下一个同级节点，则为 true；如果没有其他同级节点，或者如果 XPathNavigator 当前定位在属性节点上，则为 false。如果为 false，则 XPathNavigator 的位置不变。

适用于

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通过

XPathNavigator.MoveToNext 方法

定义

重载

MoveToNext()

返回

示例

另请参阅

适用于

MoveToNext(XPathNodeType)

参数

返回

注解

适用于

MoveToNext(String, String)

参数

返回

适用于

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