Freezable Freezable Freezable Freezable Class

定义

定义具有可修改状态和只读(冻结)状态的对象。Defines an object that has a modifiable state and a read-only (frozen) state. Freezable 派生的类提供详细更改通知,可以设置为不可变,并且可以克隆自身。Classes that derive from Freezable provide detailed change notification, can be made immutable, and can clone themselves.

public ref class Freezable abstract : System::Windows::DependencyObject
public abstract class Freezable : System.Windows.DependencyObject
type Freezable = class
    inherit DependencyObject
Public MustInherit Class Freezable
Inherits DependencyObject
继承
派生

注解

Freezable类提供了特殊功能,可帮助提高应用程序性能时使用的成本要修改或复制对象。The Freezable class provides special features that can help improve application performance when using objects that are expensive to modify or copy. 示例Freezable对象包括以下项目:Examples of Freezable objects include the following:

从 Freezable 派生Deriving From Freezable

从派生的类Freezable可以获得以下功能:A class that derives from Freezable gains the following features:

  • 特殊状态: 只读 (冻结) 状态和可写状态。Special states: a read-only (frozen) state and a writable state.

  • 线程安全: 的冻结Freezable对象可以在线程之间共享。Thread safety: a frozen Freezable object can be shared across threads.

  • 详细的更改通知: 与其他不同DependencyObject对象,Freezable子属性值更改时,对象提供更改通知。Detailed change notification: Unlike other DependencyObject objects, a Freezable object provides change notifications when sub-property values change.

  • 简单克隆: Freezable 类已经实现生成深层克隆的几种方法。Easy cloning: the Freezable class has already implemented several methods that produce deep clones.

有关使用和创建你自己Freezable对象,请参阅Freezable 对象概述For information on using and creating your own Freezable objects, see Freezable Objects Overview.

构造函数

Freezable() Freezable() Freezable() Freezable()

初始化 Freezable 派生类的新实例。Initializes a new instance of a Freezable derived class.

属性

CanFreeze CanFreeze CanFreeze CanFreeze

获取一个值,该值指示是否可将对象变为不可修改。Gets a value that indicates whether the object can be made unmodifiable.

DependencyObjectType DependencyObjectType DependencyObjectType DependencyObjectType

获取对此实例的 CLRCLR 类型进行包装的 DependencyObjectTypeGets the DependencyObjectType that wraps the CLRCLR type of this instance.

(Inherited from DependencyObject)
Dispatcher Dispatcher Dispatcher Dispatcher

获取与此 Dispatcher 关联的 DispatcherObjectGets the Dispatcher this DispatcherObject is associated with.

(Inherited from DispatcherObject)
IsFrozen IsFrozen IsFrozen IsFrozen

获取一个值,该值指示对象当前是否可修改。Gets a value that indicates whether the object is currently modifiable.

IsSealed IsSealed IsSealed IsSealed

获取一个值,该值指示此实例当前是否为密封的(只读)。Gets a value that indicates whether this instance is currently sealed (read-only).

(Inherited from DependencyObject)

方法

CheckAccess() CheckAccess() CheckAccess() CheckAccess()

确定调用线程是否可以访问此 DispatcherObjectDetermines whether the calling thread has access to this DispatcherObject.

(Inherited from DispatcherObject)
ClearValue(DependencyProperty) ClearValue(DependencyProperty) ClearValue(DependencyProperty) ClearValue(DependencyProperty)

清除属性的本地值。Clears the local value of a property. 要清除的属性由 DependencyProperty 标识符指定。The property to be cleared is specified by a DependencyProperty identifier.

(Inherited from DependencyObject)
ClearValue(DependencyPropertyKey) ClearValue(DependencyPropertyKey) ClearValue(DependencyPropertyKey) ClearValue(DependencyPropertyKey)

清除只读属性的本地值。Clears the local value of a read-only property. 要清除的属性由 DependencyPropertyKey 指定。The property to be cleared is specified by a DependencyPropertyKey.

(Inherited from DependencyObject)
Clone() Clone() Clone() Clone()

创建 Freezable 的可修改克隆,以制作该对象值的深层副本。Creates a modifiable clone of the Freezable, making deep copies of the object's values. 在复制此对象的依赖属性时,此方法会复制表达式(可能不再解析),但不复制动画或其当前值。When copying the object's dependency properties, this method copies expressions (which might no longer resolve) but not animations or their current values.

CloneCore(Freezable) CloneCore(Freezable) CloneCore(Freezable) CloneCore(Freezable)

使用基(未经过动画处理的)属性值使该实例成为指定 Freezable 的克隆(深层复制)。Makes the instance a clone (deep copy) of the specified Freezable using base (non-animated) property values.

CloneCurrentValue() CloneCurrentValue() CloneCurrentValue() CloneCurrentValue()

使用 Freezable 的当前值创建其可修改复本(深层副本)。Creates a modifiable clone (deep copy) of the Freezable using its current values.

CloneCurrentValueCore(Freezable) CloneCurrentValueCore(Freezable) CloneCurrentValueCore(Freezable) CloneCurrentValueCore(Freezable)

使用当前属性值使该实例成为指定 Freezable 的可修改克隆(深层复制)。Makes the instance a modifiable clone (deep copy) of the specified Freezable using current property values.

CoerceValue(DependencyProperty) CoerceValue(DependencyProperty) CoerceValue(DependencyProperty) CoerceValue(DependencyProperty)

对指定依赖属性的值进行强制。Coerces the value of the specified dependency property. 通过对调用方 DependencyObject 上存在的依赖属性的属性元数据中所指定的任何 CoerceValueCallback 函数进行调用来完成此操作。This is accomplished by invoking any CoerceValueCallback function specified in property metadata for the dependency property as it exists on the calling DependencyObject.

(Inherited from DependencyObject)
CreateInstance() CreateInstance() CreateInstance() CreateInstance()

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

CreateInstanceCore() CreateInstanceCore() CreateInstanceCore() CreateInstanceCore()

在派生类中实现时,创建 Freezable 派生类的新实例。When implemented in a derived class, creates a new instance of the Freezable derived class.

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

确定提供的 DependencyObject 是否等效于当前 DependencyObjectDetermines whether a provided DependencyObject is equivalent to the current DependencyObject.

(Inherited from DependencyObject)
Freeze() Freeze() Freeze() Freeze()

使当前对象不可修改,并且将其 IsFrozen 属性设置为 trueMakes the current object unmodifiable and sets its IsFrozen property to true.

Freeze(Freezable, Boolean) Freeze(Freezable, Boolean) Freeze(Freezable, Boolean) Freeze(Freezable, Boolean)

如果 isChecking 参数为 true,则此方法指示是否可将指定的 Freezable 变为不可修改。If the isChecking parameter is true, this method indicates whether the specified Freezable can be made unmodifiable. 如果 isChecking 参数为 false,则此方法尝试将指定的 Freezable 变为不可修改,并指示操作是否成功。If the isChecking parameter is false, this method attempts to make the specified Freezable unmodifiable and indicates whether the operation succeeded.

FreezeCore(Boolean) FreezeCore(Boolean) FreezeCore(Boolean) FreezeCore(Boolean)

使 Freezable 对象变为不可修改或测试是否可将其变为不可修改。Makes the Freezable object unmodifiable or tests whether it can be made unmodifiable.

GetAsFrozen() GetAsFrozen() GetAsFrozen() GetAsFrozen()

使用基(未经过动画处理的)属性值创建 Freezable 的冻结副本。Creates a frozen copy of the Freezable, using base (non-animated) property values. 由于副本已冻结,因此将通过引用复制任何冻结的子对象。Because the copy is frozen, any frozen sub-objects are copied by reference.

GetAsFrozenCore(Freezable) GetAsFrozenCore(Freezable) GetAsFrozenCore(Freezable) GetAsFrozenCore(Freezable)

让该实例成为指定的 Freezable 的冻结克隆,前者使用基(非动画的)属性值。Makes the instance a frozen clone of the specified Freezable using base (non-animated) property values.

GetCurrentValueAsFrozen() GetCurrentValueAsFrozen() GetCurrentValueAsFrozen() GetCurrentValueAsFrozen()

使用当前属性值创建 Freezable 的冻结副本。Creates a frozen copy of the Freezable using current property values. 由于副本已冻结,因此将通过引用复制任何冻结的子对象。Because the copy is frozen, any frozen sub-objects are copied by reference.

GetCurrentValueAsFrozenCore(Freezable) GetCurrentValueAsFrozenCore(Freezable) GetCurrentValueAsFrozenCore(Freezable) GetCurrentValueAsFrozenCore(Freezable)

使当前实例成为指定 Freezable 的冻结克隆。Makes the current instance a frozen clone of the specified Freezable. 如果对象具有动画依赖属性,则复制其当前的动画值。If the object has animated dependency properties, their current animated values are copied.

GetHashCode() GetHashCode() GetHashCode() GetHashCode()

获取此 DependencyObject 的哈希代码。Gets a hash code for this DependencyObject.

(Inherited from DependencyObject)
GetLocalValueEnumerator() GetLocalValueEnumerator() GetLocalValueEnumerator() GetLocalValueEnumerator()

创建一个专用的枚举数,用于确定哪些依赖项属性在此 DependencyObject 上具有以本地方式设置的值。Creates a specialized enumerator for determining which dependency properties have locally set values on this DependencyObject.

(Inherited from DependencyObject)
GetType() GetType() GetType() GetType()

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

(Inherited from Object)
GetValue(DependencyProperty) GetValue(DependencyProperty) GetValue(DependencyProperty) GetValue(DependencyProperty)

DependencyObject 的此实例返回依赖属性的当前有效值。Returns the current effective value of a dependency property on this instance of a DependencyObject.

(Inherited from DependencyObject)
InvalidateProperty(DependencyProperty) InvalidateProperty(DependencyProperty) InvalidateProperty(DependencyProperty) InvalidateProperty(DependencyProperty)

重新计算指定依赖项属性的有效值Re-evaluates the effective value for the specified dependency property

(Inherited from DependencyObject)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

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

(Inherited from Object)
OnChanged() OnChanged() OnChanged() OnChanged()

修改当前 Freezable 对象时调用。Called when the current Freezable object is modified.

OnFreezablePropertyChanged(DependencyObject, DependencyObject) OnFreezablePropertyChanged(DependencyObject, DependencyObject) OnFreezablePropertyChanged(DependencyObject, DependencyObject) OnFreezablePropertyChanged(DependencyObject, DependencyObject)

确保为刚刚设置的 DependencyObjectType 数据成员建立适当的上下文指针。Ensures that appropriate context pointers are established for a DependencyObjectType data member that has just been set.

OnFreezablePropertyChanged(DependencyObject, DependencyObject, DependencyProperty) OnFreezablePropertyChanged(DependencyObject, DependencyObject, DependencyProperty) OnFreezablePropertyChanged(DependencyObject, DependencyObject, DependencyProperty) OnFreezablePropertyChanged(DependencyObject, DependencyObject, DependencyProperty)

此成员支持 Windows Presentation Foundation (WPF)Windows Presentation Foundation (WPF) 基础结构,但不能在代码中直接使用。This member supports the Windows Presentation Foundation (WPF)Windows Presentation Foundation (WPF) infrastructure and is not intended to be used directly from your code.

OnPropertyChanged(DependencyPropertyChangedEventArgs) OnPropertyChanged(DependencyPropertyChangedEventArgs) OnPropertyChanged(DependencyPropertyChangedEventArgs) OnPropertyChanged(DependencyPropertyChangedEventArgs)

重写 OnPropertyChanged(DependencyPropertyChangedEventArgs)DependencyObject 实现,以同时调用任何响应类型 Freezable 不断变化的依赖属性的 Changed 处理程序。Overrides the DependencyObject implementation of OnPropertyChanged(DependencyPropertyChangedEventArgs) to also invoke any Changed handlers in response to a changing dependency property of type Freezable.

ReadLocalValue(DependencyProperty) ReadLocalValue(DependencyProperty) ReadLocalValue(DependencyProperty) ReadLocalValue(DependencyProperty)

如果存在,则返回依赖属性的本地值。Returns the local value of a dependency property, if it exists.

(Inherited from DependencyObject)
ReadPreamble() ReadPreamble() ReadPreamble() ReadPreamble()

确保正在从有效的线程访问 FreezableEnsures that the Freezable is being accessed from a valid thread. Freezable 的继承者必须在任何 APIAPI 一开始读取不属于依赖项对象的数据成员时调用此方法。Inheritors of Freezable must call this method at the beginning of any APIAPI that reads data members that are not dependency properties.

SetCurrentValue(DependencyProperty, Object) SetCurrentValue(DependencyProperty, Object) SetCurrentValue(DependencyProperty, Object) SetCurrentValue(DependencyProperty, Object)

设置依赖属性的值而不更改其值源。Sets the value of a dependency property without changing its value source.

(Inherited from DependencyObject)
SetValue(DependencyProperty, Object) SetValue(DependencyProperty, Object) SetValue(DependencyProperty, Object) SetValue(DependencyProperty, Object)

设置依赖属性的本地值,该值由其依赖属性标识符指定。Sets the local value of a dependency property, specified by its dependency property identifier.

(Inherited from DependencyObject)
SetValue(DependencyPropertyKey, Object) SetValue(DependencyPropertyKey, Object) SetValue(DependencyPropertyKey, Object) SetValue(DependencyPropertyKey, Object)

设置一个只读依赖属性的本地值,该值由依赖属性的 DependencyPropertyKey 标识符指定。Sets the local value of a read-only dependency property, specified by the DependencyPropertyKey identifier of the dependency property.

(Inherited from DependencyObject)
ShouldSerializeProperty(DependencyProperty) ShouldSerializeProperty(DependencyProperty) ShouldSerializeProperty(DependencyProperty) ShouldSerializeProperty(DependencyProperty)

返回一个值,该值指示序列化进程是否应序列化所提供的依赖属性的值。Returns a value that indicates whether serialization processes should serialize the value for the provided dependency property.

(Inherited from DependencyObject)
ToString() ToString() ToString() ToString()

返回表示当前对象的字符串。Returns a string that represents the current object.

(Inherited from Object)
VerifyAccess() VerifyAccess() VerifyAccess() VerifyAccess()

强制调用线程具有此 DispatcherObject 的访问权限。Enforces that the calling thread has access to this DispatcherObject.

(Inherited from DispatcherObject)
WritePostscript() WritePostscript() WritePostscript() WritePostscript()

引发 FreezableChanged 事件并调用其 OnChanged() 方法。Raises the Changed event for the Freezable and invokes its OnChanged() method. Freezable 派生的类应在修改的类成员不存储为依赖属性的任何 API 的末尾调用此方法。Classes that derive from Freezable should call this method at the end of any API that modifies class members that are not stored as dependency properties.

WritePreamble() WritePreamble() WritePreamble() WritePreamble()

验证 Freezable 是否未被冻结,并且是否正在从有效的线程上下文中访问它。Verifies that the Freezable is not frozen and that it is being accessed from a valid threading context. Freezable 的继承项应当在任何 APIAPI 一开始写入不属于依赖项属性的数据成员时调用此方法。Freezable inheritors should call this method at the beginning of any APIAPI that writes to data members that are not dependency properties.

事件

Changed Changed Changed Changed

在修改 Freezable 或其包含的对象时发生。Occurs when the Freezable or an object it contains is modified.

适用于

线程安全性

任何公共static此类型的成员是线程安全。Any public static members of this type are thread safe. 但不保证所有实例成员都是线程安全的。Any instance members are not guaranteed to be thread safe.

IsFrozen属性是falseFreezable可以仅从其创建的线程访问对象。When the IsFrozen property is false, a Freezable object can be accessed only from the thread on which it was created. 尝试从另一个线程,则会引发访问InvalidOperationExceptionAttempting to access it from another thread throws an InvalidOperationException. InvokeBeginInvoke方法为封送到正确的线程提供支持。The Invoke and BeginInvoke methods provide support for marshalling to the correct thread.

当他们IsFrozen属性是trueFreezable对象是自由线程。When their IsFrozen property is true, Freezable objects are free-threaded. 有关详细信息,请参阅 Freezable 对象概述For more information, see Freezable Objects Overview.