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XmlReader.Item[] Property

Definition

When overridden in a derived class, gets the value of the attribute.

Overloads

Item[Int32]

When overridden in a derived class, gets the value of the attribute with the specified index.

Item[String]

When overridden in a derived class, gets the value of the attribute with the specified Name.

Item[String, String]

When overridden in a derived class, gets the value of the attribute with the specified LocalName and NamespaceURI.

Item[Int32]

Source:
XmlReader.cs
Source:
XmlReader.cs
Source:
XmlReader.cs

When overridden in a derived class, gets the value of the attribute with the specified index.

public virtual string this[int i] { get; }
public abstract string this[int i] { get; }

Parameters

i
Int32

The index of the attribute.

Property Value

The value of the specified attribute.

Exceptions

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 all attributes on the current node.

// Display all attributes.
if (reader.HasAttributes) {
  Console.WriteLine("Attributes of <" + reader.Name + ">");
  for (int i = 0; i < reader.AttributeCount; i++) {
    Console.WriteLine("  {0}", reader[i]);
  }
  // Move the reader back to the element node.
  reader.MoveToElement();
}

Remarks

This property does not move the reader.

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

Item[String]

Source:
XmlReader.cs
Source:
XmlReader.cs
Source:
XmlReader.cs

When overridden in a derived class, gets the value of the attribute with the specified Name.

public virtual string this[string name] { get; }
public virtual string? this[string name] { get; }
public abstract string this[string name] { get; }

Parameters

name
String

The qualified name of the attribute.

Property Value

The value of the specified attribute. If the attribute is not found, null is returned.

Exceptions

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 gets the value of the ISBN attribute.

reader.ReadToDescendant("book");
string isbn =reader["ISBN"];
Console.WriteLine("The ISBN value: " + isbn);

Remarks

This property does not move the reader.

If the reader is positioned on a DocumentType node, this method can be used to get the PUBLIC and SYSTEM literals, for example, reader["PUBLIC"]

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

Item[String, String]

Source:
XmlReader.cs
Source:
XmlReader.cs
Source:
XmlReader.cs

When overridden in a derived class, gets the value of the attribute with the specified LocalName and NamespaceURI.

public virtual string this[string name, string namespaceURI] { get; }
public virtual string? this[string name, string? namespaceURI] { get; }
public abstract string this[string name, string namespaceURI] { get; }

Parameters

name
String

The local name of the attribute.

namespaceURI
String

The namespace URI of the attribute.

Property Value

The value of the specified attribute. If the attribute is not found, null is returned.

Exceptions

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 property does not move the reader.

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