XElement.ReplaceAll Metodo

Definizione

Overload

Esempio

Nell'esempio seguente vengono passati i risultati di una query LINQ a questo metodo, sostituendo il contenuto di un elemento con i risultati della query. Esegue una query sull'elemento con il relativo contenuto sostituito.

XElement xmlTree = new XElement("Root",
    new XElement("Data", 1),
    new XElement("Data", 2),
    new XElement("Data", 3),
    new XElement("Data", 4),
    new XElement("Data", 5)
);

Console.WriteLine(xmlTree);
Console.WriteLine("-----");

xmlTree.ReplaceAll(
    from el in xmlTree.Elements()
    where (int)el >= 3
    select new XElement("NewData", (int)el)
);

Console.WriteLine(xmlTree);

Dim xmlTree As XElement = _
    <Root>
        <Data>1</Data>
        <Data>2</Data>
        <Data>3</Data>
        <Data>4</Data>
        <Data>5</Data>
    </Root>

Console.WriteLine(xmlTree)
Console.WriteLine("-----")

xmlTree.ReplaceAll( _
    From el In xmlTree.Elements _
    Where el.Value >= 3 _
    Select <NewData><%= el.Value %></NewData> _
)

Console.WriteLine(xmlTree)

Nell'esempio viene prodotto l'output seguente:

<Root>
  <Data>1</Data>
  <Data>2</Data>
  <Data>3</Data>
  <Data>4</Data>
  <Data>5</Data>
</Root>
-----
<Root>
  <NewData>3</NewData>
  <NewData>4</NewData>
  <NewData>5</NewData>
</Root>

Commenti

Questo metodo usa la semantica snapshot, ovvero crea una copia separata del nuovo contenuto prima di sostituire il contenuto dell'elemento corrente con il nuovo contenuto. Ciò significa che è possibile eseguire una query sul contenuto dell'elemento corrente e usare i risultati della query come nuovo contenuto specificato.

Per informazioni dettagliate sul contenuto valido che può essere passato a questa funzione, vedere Contenuto valido di oggetti XElement e XDocument.

Questo metodo genererà gli Changed eventi e Changing .

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

public void ReplaceAll (object content);

public void ReplaceAll (object? content);

member this.ReplaceAll : obj -> unit

Public Sub ReplaceAll (content As Object)

XElement root = new XElement("Root",
    new XElement("Child", "child content")
);

// ReplaceAll with an XElement object.
root.ReplaceAll(new XElement("NewChild", "n"));
Console.WriteLine(root);

// ReplaceAll with an XAttribute object.
root.ReplaceAll(new XAttribute("NewAttribute", "n"));
Console.WriteLine(root);

// ReplaceAll with a string.
root.ReplaceAll("Some text");
Console.WriteLine(root);

// ReplaceAll with a double.
double dbl = 12.345;
root.ReplaceAll(dbl);
Console.WriteLine(root);

// ReplaceAll with a DateTime object.
DateTime dt = new DateTime(2006, 10, 6, 12, 30, 00);
root.ReplaceAll(dt);
Console.WriteLine(root);

// ReplaceAll with a string array.
// Any collection other than a collection of XElement or XAttribute objects
// are converted to strings. The strings are concatenated and added.
string[] stringArray = {
    "abc",
    "def",
    "ghi"
};
root.ReplaceAll(stringArray);
Console.WriteLine(root);

// ReplaceAll with an array of XElement objects.
XElement[] ellArray = {
    new XElement("NewChild1", 1),
    new XElement("NewChild2", 2),
    new XElement("NewChild3", 3)
};
root.ReplaceAll(ellArray);
Console.WriteLine(root);

// ReplaceAll with an array of XAttribute objects.
XAttribute[] attArray = {
    new XAttribute("NewAtt1", 1),
    new XAttribute("NewAtt2", 2),
    new XAttribute("NewAtt3", 3)
};
root.ReplaceAll(attArray);
Console.WriteLine(root);

Dim root As XElement = _
    <Root>
        <Child>child content</Child>
    </Root>

' ReplaceAll with an XElement object.
root.ReplaceAll(<NewChild>n</NewChild>)
Console.WriteLine(root)

' ReplaceAll with an XAttribute object.
root.ReplaceAll(New XAttribute("NewAttribute", "n"))
Console.WriteLine(root)

' ReplaceAll with a string.
root.ReplaceAll("Some text")
Console.WriteLine(root)

' ReplaceAll with a double.
Dim dbl As Double = 12.345
root.ReplaceAll(dbl)
Console.WriteLine(root)

' ReplaceAll with a DateTime object.
Dim dt As DateTime = New DateTime(2006, 10, 6, 12, 30, 0)
root.ReplaceAll(dt)
Console.WriteLine(root)

' ReplaceAll with a string array.
' Any collection other than a collection of XElement or XAttribute objects
' are converted to strings. The strings are concatenated and added.
Dim stringArray As String() = { _
    "abc", _
    "def", _
    "ghi" _
}
root.ReplaceAll(stringArray)
Console.WriteLine(root)

' ReplaceAll with an array of XElement objects.
Dim ellArray As XElement() = { _
    New XElement("NewChild1", 1), _
    New XElement("NewChild2", 2), _
    New XElement("NewChild3", 3) _
}
root.ReplaceAll(ellArray)
Console.WriteLine(root)

' ReplaceAll with an array of XAttribute objects.
Dim attArray As XAttribute() = { _
New XAttribute("NewAtt1", 1), _
New XAttribute("NewAtt2", 2), _
New XAttribute("NewAtt3", 3) _
}
root.ReplaceAll(attArray)
Console.WriteLine(root)

<Root>
  <NewChild>n</NewChild>
</Root>
<Root NewAttribute="n" />
<Root>Some text</Root>
<Root>12.345</Root>
<Root>2006-10-06T12:30:00</Root>
<Root>abcdefghi</Root>
<Root>
  <NewChild1>1</NewChild1>
  <NewChild2>2</NewChild2>
  <NewChild3>3</NewChild3>
</Root>
<Root NewAtt1="1" NewAtt2="2" NewAtt3="3" />

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

public void ReplaceAll (params object[] content);

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

member this.ReplaceAll : obj[] -> unit

Public Sub ReplaceAll (ParamArray content As Object())

XElement xmlTree1 = new XElement("Root",
    new XElement("Child1", 1),
    new XElement("Child2", 2),
    new XElement("Child3", 3),
    new XElement("Child4", 4),
    new XElement("Child5", 5),
    new XElement("Child6", 6)
);

XElement root = new XElement("Root",
    new XElement("Child", "child content")
);

root.ReplaceAll(
    from el in xmlTree1.Elements()
    where((int)el >= 3 && (int)el <= 5)
    select el
);
Console.WriteLine(root);

Dim xmlTree1 As XElement = _
        <Root>
            <Child1>1</Child1>
            <Child2>2</Child2>
            <Child3>3</Child3>
            <Child4>4</Child4>
            <Child5>5</Child5>
            <Child6>6</Child6>
        </Root>

Dim root As XElement = <Root>
                           <Child>child content</Child>
                       </Root>

root.ReplaceAll( _
    From el In xmlTree1.Elements() _
    Where el.Value >= 3 And el.Value <= 5 _
    Select el _
)

Console.WriteLine(root)

<Root>
  <Child3>3</Child3>
  <Child4>4</Child4>
  <Child5>5</Child5>
</Root>