XmlReader.IsStartElement Method
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Tests if the current content node is a start tag.
IsStartElement(String, String) |
Calls MoveToContent() and tests if the current content node is a start tag or empty element tag and if the LocalName and NamespaceURI properties of the element found match the given strings. |
IsStartElement() |
Calls MoveToContent() and tests if the current content node is a start tag or empty element tag. |
IsStartElement(String) |
Calls MoveToContent() and tests if the current content node is a start tag or empty element tag and if the Name property of the element found matches the given argument. |
- Source:
- XmlReader.cs
- Source:
- XmlReader.cs
- Source:
- XmlReader.cs
Calls MoveToContent() and tests if the current content node is a start tag or empty element tag and if the LocalName and NamespaceURI properties of the element found match the given strings.
public:
virtual bool IsStartElement(System::String ^ localname, System::String ^ ns);
public virtual bool IsStartElement (string localname, string ns);
abstract member IsStartElement : string * string -> bool
override this.IsStartElement : string * string -> bool
Public Overridable Function IsStartElement (localname As String, ns As String) As Boolean
Parameters
- localname
- String
The string to match against the LocalName
property of the element found.
- ns
- String
The string to match against the NamespaceURI
property of the element found.
Returns
true
if the resulting node is an element. false
if a node type other than XmlNodeType.Element
was found or if the LocalName
and NamespaceURI
properties of the element do not match the specified strings.
Exceptions
Incorrect XML is encountered in the input stream.
An XmlReader method was called before a previous asynchronous operation finished. In this case, InvalidOperationException is thrown with the message "An asynchronous operation is already in progress."
Remarks
This method skips white space, comments, and processing instructions until the reader is positioned on a content node. The method then tests if the current node is an element.
See also
Applies to
.NET 9 и други версии
Продукт | Версии |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 1.0, 1.1, 1.2, 1.3, 1.4, 1.6, 2.0, 2.1 |
UWP | 10.0 |
- Source:
- XmlReader.cs
- Source:
- XmlReader.cs
- Source:
- XmlReader.cs
Calls MoveToContent() and tests if the current content node is a start tag or empty element tag.
public:
virtual bool IsStartElement();
public virtual bool IsStartElement ();
abstract member IsStartElement : unit -> bool
override this.IsStartElement : unit -> bool
Public Overridable Function IsStartElement () As Boolean
Returns
true
if MoveToContent() finds a start tag or empty element tag; false
if a node type other than XmlNodeType.Element
was found.
Exceptions
Incorrect XML is encountered in the input stream.
An XmlReader method was called before a previous asynchronous operation finished. In this case, InvalidOperationException is thrown with the message "An asynchronous operation is already in progress."
Examples
The following example displays the text content of each element.
while (reader.Read()) {
if (reader.IsStartElement()) {
if (reader.IsEmptyElement)
{
Console.WriteLine("<{0}/>", reader.Name);
}
else {
Console.Write("<{0}> ", reader.Name);
reader.Read(); // Read the start tag.
if (reader.IsStartElement()) // Handle nested elements.
Console.Write("\r\n<{0}>", reader.Name);
Console.WriteLine(reader.ReadString()); //Read the text content of the element.
}
}
}
While reader.Read()
If reader.IsStartElement() Then
If reader.IsEmptyElement Then
Console.WriteLine("<{0}/>", reader.Name)
Else
Console.Write("<{0}> ", reader.Name)
reader.Read() ' Read the start tag.
If reader.IsStartElement() Then ' Handle nested elements.
Console.Write(vbCr + vbLf + "<{0}>", reader.Name)
End If
Console.WriteLine(reader.ReadString()) 'Read the text content of the element.
End If
End If
End While
The example uses the file, elems.xml
, as input.
<book>
<title>Pride And Prejudice</title>
<price>19.95</price>
<misc/>
</book>
Remarks
This method skips white space, comments, and processing instructions until the reader is positioned on a content node. The method then tests if the current node is an element.
See also
Applies to
.NET 9 и други версии
Продукт | Версии |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 1.0, 1.1, 1.2, 1.3, 1.4, 1.6, 2.0, 2.1 |
UWP | 10.0 |
- Source:
- XmlReader.cs
- Source:
- XmlReader.cs
- Source:
- XmlReader.cs
Calls MoveToContent() and tests if the current content node is a start tag or empty element tag and if the Name property of the element found matches the given argument.
public:
virtual bool IsStartElement(System::String ^ name);
public virtual bool IsStartElement (string name);
abstract member IsStartElement : string -> bool
override this.IsStartElement : string -> bool
Public Overridable Function IsStartElement (name As String) As Boolean
Parameters
- name
- String
The string matched against the Name
property of the element found.
Returns
true
if the resulting node is an element and the Name
property matches the specified string. false
if a node type other than XmlNodeType.Element
was found or if the element Name
property does not match the specified string.
Exceptions
Incorrect XML is encountered in the input stream.
An XmlReader method was called before a previous asynchronous operation finished. In this case, InvalidOperationException is thrown with the message "An asynchronous operation is already in progress."
Examples
The following example displays each price element.
// Parse the file and display each price node.
while (reader.Read()) {
if (reader.IsStartElement("price")) {
Console.WriteLine(reader.ReadInnerXml());
}
}
' Parse the file and display each price node.
While reader.Read()
If reader.IsStartElement("price") Then
Console.WriteLine(reader.ReadInnerXml())
End If
End While
Remarks
This method skips white space, comments, and processing instructions until the reader is positioned on a content node. The method then tests if the current node is an element.
See also
Applies to
.NET 9 и други версии
Продукт | Версии |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 1.0, 1.1, 1.2, 1.3, 1.4, 1.6, 2.0, 2.1 |
UWP | 10.0 |
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