XNode.AddBeforeSelf 方法

定义

重载

示例

以下示例使用 LINQ 查询创建 的 XElement，IEnumerable<T>然后将其传递给此方法。 这会将查询的结果添加到所需位置的树中。

XElement srcTree = new XElement("Root",
    new XElement("Element1", 1),
    new XElement("Element2", 2),
    new XElement("Element3", 3),
    new XElement("Element4", 4),
    new XElement("Element5", 5)
);
XElement xmlTree = new XElement("Root",
    new XElement("Child1", 1),
    new XElement("Child2", 2),
    new XElement("Child3", 3),
    new XElement("Child4", 4),
    new XElement("Child5", 5)
);
XElement child1 = xmlTree.Element("Child1");
child1.AddBeforeSelf(
    from el in srcTree.Elements()
    where (int)el > 3
    select el
);
Console.WriteLine(xmlTree);

Dim srcTree As XElement = _
        <Root>
            <Element1>1</Element1>
            <Element2>2</Element2>
            <Element3>3</Element3>
            <Element4>4</Element4>
            <Element5>5</Element5>
        </Root>

Dim xmlTree As XElement = _
        <Root>
            <Child1>1</Child1>
            <Child2>2</Child2>
            <Child3>3</Child3>
            <Child4>4</Child4>
            <Child5>5</Child5>
        </Root>

Dim child1 As XElement = xmlTree.<Child1>(0)
child1.AddBeforeSelf( _
From el In srcTree.Elements() _
Where CInt(el) > 3 _
Select el)

Console.WriteLine(xmlTree)

该示例产生下面的输出：

<Root>
  <Element4>4</Element4>
  <Element5>5</Element5>
  <Child1>1</Child1>
  <Child2>2</Child2>
  <Child3>3</Child3>
  <Child4>4</Child4>
  <Child5>5</Child5>
</Root>

注解

有关可传递给此方法的有效内容的详细信息，请参阅 XElement 和 XDocument 对象的有效内容。

此方法将引发 Changed 和 Changing 事件。

将其 XContainer 子笔记存储为单独链接的对象 XNode 列表。 这意味着 方法 AddBeforeSelf 必须遍历父容器下的直接子节点列表。 因此，使用此方法可能会影响性能。

public:
 void AddBeforeSelf(System::Object ^ content);

public void AddBeforeSelf(object content);

public void AddBeforeSelf(object? content);

member this.AddBeforeSelf : obj -> unit

Public Sub AddBeforeSelf (content As Object)

XElement xmlTree = new XElement("Root",
    new XElement("Child1", 1),
    new XElement("Child2", 2),
    new XElement("Child3", 3),
    new XElement("Child4", 4),
    new XElement("Child5", 5)
);
XElement child1 = xmlTree.Element("Child1");
child1.AddBeforeSelf(
    new XElement("NewChild", 10)
);
Console.WriteLine(xmlTree);

Dim xmlTree As XElement = _
        <Root>
            <Child1>1</Child1>
            <Child2>2</Child2>
            <Child3>3</Child3>
            <Child4>4</Child4>
            <Child5>5</Child5>
        </Root>

Dim child1 As XElement = xmlTree.<Child1>(0)
child1.AddBeforeSelf(New XElement("NewChild", 10))
Console.WriteLine(xmlTree)

<Root>
  <NewChild>10</NewChild>
  <Child1>1</Child1>
  <Child2>2</Child2>
  <Child3>3</Child3>
  <Child4>4</Child4>
  <Child5>5</Child5>
</Root>

public:
 void AddBeforeSelf(... cli::array <System::Object ^> ^ content);

public void AddBeforeSelf(params object[] content);

public void AddBeforeSelf(params object?[] content);

member this.AddBeforeSelf : obj[] -> unit

Public Sub AddBeforeSelf (ParamArray content As Object())

XElement srcTree = new XElement("Root",
    new XElement("Element1", 1),
    new XElement("Element2", 2),
    new XElement("Element3", 3),
    new XElement("Element4", 4),
    new XElement("Element5", 5)
);
XElement xmlTree = new XElement("Root",
    new XElement("Child1", 1),
    new XElement("Child2", 2),
    new XElement("Child3", 3),
    new XElement("Child4", 4),
    new XElement("Child5", 5)
);
XElement child1 = xmlTree.Element("Child1");
child1.AddBeforeSelf(
    from el in srcTree.Elements()
    where (int)el > 3
    select el
);
Console.WriteLine(xmlTree);

Dim srcTree As XElement = _
        <Root>
            <Element1>1</Element1>
            <Element2>2</Element2>
            <Element3>3</Element3>
            <Element4>4</Element4>
            <Element5>5</Element5>
        </Root>

Dim xmlTree As XElement = _
        <Root>
            <Child1>1</Child1>
            <Child2>2</Child2>
            <Child3>3</Child3>
            <Child4>4</Child4>
            <Child5>5</Child5>
        </Root>

Dim child1 As XElement = xmlTree.<Child1>(0)
child1.AddBeforeSelf( _
    From el In srcTree.Elements() _
    Where CInt(el) > 3 _
    Select el)

Console.WriteLine(xmlTree)

<Root>
  <Element4>4</Element4>
  <Element5>5</Element5>
  <Child1>1</Child1>
  <Child2>2</Child2>
  <Child3>3</Child3>
  <Child4>4</Child4>
  <Child5>5</Child5>
</Root>