DictionaryKeyPropertyAttribute 类

定义

指定提供隐式键值的关联类的属性。Specifies a property of the associated class that provides the implicit key value. 对于 IDictionary 集合中的项,隐式键用于除 XAML 中定义的显式 x:Key 属性以外的键。Implicit keys are used for keys rather than explicit x:Key attributes defined in XAML for an item in IDictionary collections.

public ref class DictionaryKeyPropertyAttribute sealed : Attribute
public sealed class DictionaryKeyPropertyAttribute : Attribute
[System.AttributeUsage(System.AttributeTargets.Class, AllowMultiple=false, Inherited=true)]
public sealed class DictionaryKeyPropertyAttribute : Attribute
type DictionaryKeyPropertyAttribute = class
    inherit Attribute
Public NotInheritable Class DictionaryKeyPropertyAttribute
Inherits Attribute
继承
DictionaryKeyPropertyAttribute
属性

注解

IDictionary 字典中的项(如 WPFWPF ResourceDictionary)需要键。Items in an IDictionary dictionary (such as the WPFWPF ResourceDictionary) require a key. 在 XAML 中,通常通过 IDictionary中的每一项的 XAML 标记 x:Key 特性来指定键。In XAML, the key is typically specified by x:Key attribute in the XAML markup for each item in the IDictionary. DictionaryKeyPropertyAttribute 应用于使用隐式密钥的类,其中用于 IDictionary 包含的密钥来自类中的不同属性值。The DictionaryKeyPropertyAttribute is applied to classes that work with an implicit key, where the key to use for IDictionary inclusion comes from a different property value in the class. 应用 DictionaryKeyPropertyAttribute 的类的实例可以包括在没有显式键的 IDictionary 中,只要 IDictionary 引用的属性有一个作为该字典实现中的键有效的值。Instances of the class applying the DictionaryKeyPropertyAttribute can be included in an IDictionary without an explicit key so long as the property referenced by IDictionary has a value that is valid as a key in that dictionary implementation.

在 .NET Framework 的以前版本中,此类存在于 WPF 特定的程序集 WindowsBase 中。In previous versions of the .NET Framework, this class existed in the WPF-specific assembly WindowsBase. .NET Framework 4.NET Framework 4中,DictionaryKeyPropertyAttribute 在 system.exception 程序集中。In .NET Framework 4.NET Framework 4, DictionaryKeyPropertyAttribute is in the System.Xaml assembly. 有关详细信息,请参阅 Types Migrated from WPF to System.XamlFor more information, see Types Migrated from WPF to System.Xaml.

WPF 用法说明WPF Usage Notes

以下列表引用应用此特性的 WPF Api 的示例:The following list references examples of WPF APIs where this attribute is applied:

有关 DictionaryKeyPropertyAttribute的 WPF 资源字典含义的详细信息,请参阅XAML 资源For more information about the WPF resource dictionary implications of DictionaryKeyPropertyAttribute, see XAML Resources.

构造函数

DictionaryKeyPropertyAttribute(String)

初始化 DictionaryKeyPropertyAttribute 类的新实例。Initializes a new instance of the DictionaryKeyPropertyAttribute class.

属性

Name

获取提供隐式键值的属性的名称。Gets the name of the property that provides the implicit key value.

TypeId

在派生类中实现时,获取此 Attribute 的唯一标识符。When implemented in a derived class, gets a unique identifier for this Attribute.

(继承自 Attribute)

方法

Equals(Object)

返回一个值,该值指示此实例是否与指定的对象相等。Returns a value that indicates whether this instance is equal to a specified object.

(继承自 Attribute)
GetHashCode()

返回此实例的哈希代码。Returns the hash code for this instance.

(继承自 Attribute)
GetType()

获取当前实例的 TypeGets the Type of the current instance.

(继承自 Object)
IsDefaultAttribute()

在派生类中重写时,指示此实例的值是否是派生类的默认值。When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.

(继承自 Attribute)
Match(Object)

当在派生类中重写时,返回一个指示此实例是否等于指定对象的值。When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.

(继承自 Attribute)
MemberwiseClone()

创建当前 Object 的浅表副本。Creates a shallow copy of the current Object.

(继承自 Object)
ToString()

返回一个表示当前对象的 string。Returns a string that represents the current object.

(继承自 Object)

显式接口实现

_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

将一组名称映射为对应的一组调度标识符。Maps a set of names to a corresponding set of dispatch identifiers.

(继承自 Attribute)
_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)

检索对象的类型信息,然后可以使用该信息获取接口的类型信息。Retrieves the type information for an object, which can be used to get the type information for an interface.

(继承自 Attribute)
_Attribute.GetTypeInfoCount(UInt32)

检索对象提供的类型信息接口的数量(0 或 1)。Retrieves the number of type information interfaces that an object provides (either 0 or 1).

(继承自 Attribute)
_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

提供对某一对象公开的属性和方法的访问。Provides access to properties and methods exposed by an object.

(继承自 Attribute)

适用于

另请参阅