XmlReader.Item[] 属性

public:
 virtual property System::String ^ default[int] { System::String ^ get(int i); };

public:
 abstract property System::String ^ default[int] { System::String ^ get(int i); };

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

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

member this.Item(int) : string

Default Public Overridable ReadOnly Property Item(i As Integer) As String

Default Public MustOverride ReadOnly Property Item(i As Integer) As String

参数

属性值

String

指定的属性的值。

例外

示例

以下示例显示当前节点上的所有属性。

// 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();
}

' Display all attributes.
If reader.HasAttributes Then
  Console.WriteLine("Attributes of <" + reader.Name + ">")
  Dim i As Integer
  For i = 0 To (reader.AttributeCount - 1)
    Console.WriteLine("  {0}", reader(i))
  Next i
  ' Move the reader back to the element node.
  reader.MoveToElement() 
End If

注解

此属性不会移动读取器。

另请参阅

• GetAttribute(Int32)

public:
 virtual property System::String ^ default[System::String ^] { System::String ^ get(System::String ^ name); };

public:
 abstract property System::String ^ default[System::String ^] { System::String ^ get(System::String ^ name); };

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

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

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

member this.Item(string) : string

Default Public Overridable ReadOnly Property Item(name As String) As String

Default Public MustOverride ReadOnly Property Item(name As String) As String

参数

属性值

String

指定的属性的值。 如果未找到该属性，则返回 null。

例外

示例

以下示例获取 ISBN 属性的值。

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

reader.ReadToDescendant("book")
Dim isbn As String = reader("ISBN")
Console.WriteLine("The ISBN value: " + isbn)

注解

此属性不会移动读取器。

如果读取器定位在 DocumentType 节点上，则此方法可用于获取 PUBLIC 和 SYSTEM 文本，例如 reader["PUBLIC"]

另请参阅

• GetAttribute(String)

public:
 virtual property System::String ^ default[System::String ^, System::String ^] { System::String ^ get(System::String ^ name, System::String ^ namespaceURI); };

public:
 abstract property System::String ^ default[System::String ^, System::String ^] { System::String ^ get(System::String ^ name, System::String ^ 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; }

member this.Item(string * string) : string

Default Public Overridable ReadOnly Property Item(name As String, namespaceURI As String) As String

Default Public MustOverride ReadOnly Property Item(name As String, namespaceURI As String) As String

参数

属性值

String

指定的属性的值。 如果未找到该属性，则返回 null。

例外

注解

此属性不会移动读取器。

另请参阅

• GetAttribute(String, String)