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

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

其他资源