FrameworkPropertyMetadata Constructors
Definition
Important
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Initializes a new instance of the FrameworkPropertyMetadata class.
Overloads
| FrameworkPropertyMetadata() |
Initializes a new instance of the FrameworkPropertyMetadata class. |
| FrameworkPropertyMetadata(Object) |
Initializes a new instance of the FrameworkPropertyMetadata class with the specified default value. |
| FrameworkPropertyMetadata(PropertyChangedCallback) |
Initializes a new instance of the FrameworkPropertyMetadata class with the specified PropertyChangedCallback callback. |
| FrameworkPropertyMetadata(Object, FrameworkPropertyMetadataOptions) |
Initializes a new instance of the FrameworkPropertyMetadata class with the provided default value and framework-level metadata options. |
| FrameworkPropertyMetadata(Object, PropertyChangedCallback) |
Initializes a new instance of the FrameworkPropertyMetadata class with the provided default value and specified PropertyChangedCallback callback. |
| FrameworkPropertyMetadata(PropertyChangedCallback, CoerceValueCallback) |
Initializes a new instance of the FrameworkPropertyMetadata class with the specified callbacks. |
| FrameworkPropertyMetadata(Object, FrameworkPropertyMetadataOptions, PropertyChangedCallback) |
Initializes a new instance of the FrameworkPropertyMetadata class with the provided default value and framework metadata options, and specified PropertyChangedCallback callback. |
| FrameworkPropertyMetadata(Object, PropertyChangedCallback, CoerceValueCallback) |
Initializes a new instance of the FrameworkPropertyMetadata class with the provided default value and specified callbacks. |
| FrameworkPropertyMetadata(Object, FrameworkPropertyMetadataOptions, PropertyChangedCallback, CoerceValueCallback) |
Initializes a new instance of the FrameworkPropertyMetadata class with the provided default value and framework metadata options, and specified callbacks. |
| FrameworkPropertyMetadata(Object, FrameworkPropertyMetadataOptions, PropertyChangedCallback, CoerceValueCallback, Boolean) |
Initializes a new instance of the FrameworkPropertyMetadata class with the provided default value and framework metadata options, specified callbacks, and a Boolean that can be used to prevent animation of the property. |
| FrameworkPropertyMetadata(Object, FrameworkPropertyMetadataOptions, PropertyChangedCallback, CoerceValueCallback, Boolean, UpdateSourceTrigger) |
Initializes a new instance of the FrameworkPropertyMetadata class with the provided default value and framework metadata options, specified callbacks, a Boolean that can be used to prevent animation of the property, and a data-binding update trigger default. |
FrameworkPropertyMetadata()
Initializes a new instance of the FrameworkPropertyMetadata class.
public:
FrameworkPropertyMetadata();public FrameworkPropertyMetadata ();Public Sub New ()Remarks
This signature initializes all values of FrameworkPropertyMetadata to their property defaults. DefaultValue will be null, and the various FrameworkPropertyMetadata Boolean properties will be false.
See also
Applies to
FrameworkPropertyMetadata(Object)
Initializes a new instance of the FrameworkPropertyMetadata class with the specified default value.
public:
FrameworkPropertyMetadata(System::Object ^ defaultValue);public FrameworkPropertyMetadata (object defaultValue);new System.Windows.FrameworkPropertyMetadata : obj -> System.Windows.FrameworkPropertyMetadataPublic Sub New (defaultValue As Object)Parameters
- defaultValue
- Object
The default value of the dependency property, usually provided as a value of a specific type.
Exceptions
defaultValue is set to UnsetValue.
Examples
The following example calls this constructor signature:
static FrameworkPropertyMetadata fpm;
fpm = new FrameworkPropertyMetadata(Double.NaN);
Remarks
The type of the value provided for defaultValue must match or be related to the type specified in the original registration of the dependency property that this metadata will be applied to. Mismatches between metadata default value type and the type of the dependency property it is being applied to can be difficult to debug, because the mismatch is not detectable during compilation. The property system does not evaluate the effective value of a property until run time, so the result of a default value type/property type mismatch is a run-time error.
The value UnsetValue has special meaning in the property system, and cannot be used as a dependency property default value.
See also
Applies to
FrameworkPropertyMetadata(PropertyChangedCallback)
Initializes a new instance of the FrameworkPropertyMetadata class with the specified PropertyChangedCallback callback.
public:
FrameworkPropertyMetadata(System::Windows::PropertyChangedCallback ^ propertyChangedCallback);public FrameworkPropertyMetadata (System.Windows.PropertyChangedCallback propertyChangedCallback);new System.Windows.FrameworkPropertyMetadata : System.Windows.PropertyChangedCallback -> System.Windows.FrameworkPropertyMetadataPublic Sub New (propertyChangedCallback As PropertyChangedCallback)Parameters
- propertyChangedCallback
- PropertyChangedCallback
A reference to a handler implementation that the property system will call whenever the effective value of the property changes.
Examples
The following example calls this constructor signature:
static FrameworkPropertyMetadata fpm;
fpm = new FrameworkPropertyMetadata(new PropertyChangedCallback(OnCurrentReadingChanged));
Applies to
FrameworkPropertyMetadata(Object, FrameworkPropertyMetadataOptions)
Initializes a new instance of the FrameworkPropertyMetadata class with the provided default value and framework-level metadata options.
public:
FrameworkPropertyMetadata(System::Object ^ defaultValue, System::Windows::FrameworkPropertyMetadataOptions flags);public FrameworkPropertyMetadata (object defaultValue, System.Windows.FrameworkPropertyMetadataOptions flags);new System.Windows.FrameworkPropertyMetadata : obj * System.Windows.FrameworkPropertyMetadataOptions -> System.Windows.FrameworkPropertyMetadataPublic Sub New (defaultValue As Object, flags As FrameworkPropertyMetadataOptions)Parameters
- defaultValue
- Object
The default value of the dependency property, usually provided as a value of a specific type.
The metadata option flags (a combination of FrameworkPropertyMetadataOptions values). These options specify characteristics of the dependency property that interact with systems such as layout or data binding.
Exceptions
defaultValue is set to UnsetValue.
Examples
The following example calls this constructor signature:
static FrameworkPropertyMetadata fpm;
fpm = new FrameworkPropertyMetadata(
Double.NaN,
(FrameworkPropertyMetadataOptions.AffectsRender |
FrameworkPropertyMetadataOptions.BindsTwoWayByDefault)
);
Remarks
The type of the value provided for defaultValue must match or be related to the type specified in the original registration of the dependency property that this metadata will be applied to. Mismatches between metadata default value type and the type of the dependency property it is being applied to can be difficult to debug, because the mismatch is not detectable during compilation. The property system does not evaluate the effective value of a property until run time, so the result of a default value type/property type mismatch is a run-time error.
The value UnsetValue has special meaning in the property system, and cannot be used as a dependency property default value.
Values marked as set flags in the flags parameter will set the Boolean value of FrameworkPropertyMetadata properties that match that FrameworkPropertyMetadataOptions flag's name to true. You can subsequently change the values of the properties in the metadata, as long as the metadata has not yet been applied to a specific property system operation.
See also
Applies to
FrameworkPropertyMetadata(Object, PropertyChangedCallback)
Initializes a new instance of the FrameworkPropertyMetadata class with the provided default value and specified PropertyChangedCallback callback.
public:
FrameworkPropertyMetadata(System::Object ^ defaultValue, System::Windows::PropertyChangedCallback ^ propertyChangedCallback);public FrameworkPropertyMetadata (object defaultValue, System.Windows.PropertyChangedCallback propertyChangedCallback);new System.Windows.FrameworkPropertyMetadata : obj * System.Windows.PropertyChangedCallback -> System.Windows.FrameworkPropertyMetadataPublic Sub New (defaultValue As Object, propertyChangedCallback As PropertyChangedCallback)Parameters
- defaultValue
- Object
The default value of the dependency property, usually provided as a value of a specific type.
- propertyChangedCallback
- PropertyChangedCallback
A reference to a handler implementation that the property system will call whenever the effective value of the property changes.
Exceptions
defaultValue is set to UnsetValue.
Examples
The following example calls this constructor signature:
static FrameworkPropertyMetadata fpm;
fpm = new FrameworkPropertyMetadata(
Double.NaN,
new PropertyChangedCallback(OnCurrentReadingChanged)
);
Remarks
The type of the value provided for defaultValue must match or be related to the type specified in the original registration of the dependency property that this metadata will be applied to. Mismatches between metadata default value type and the type of the dependency property it is being applied to can be difficult to debug, because the mismatch is not detectable during compilation. The property system does not evaluate the effective value of a property until run time, so the result of a default value type/property type mismatch is a run-time error.
The value UnsetValue has special meaning in the property system, and cannot be used as a dependency property default value.
See also
Applies to
FrameworkPropertyMetadata(PropertyChangedCallback, CoerceValueCallback)
Initializes a new instance of the FrameworkPropertyMetadata class with the specified callbacks.
public:
FrameworkPropertyMetadata(System::Windows::PropertyChangedCallback ^ propertyChangedCallback, System::Windows::CoerceValueCallback ^ coerceValueCallback);public FrameworkPropertyMetadata (System.Windows.PropertyChangedCallback propertyChangedCallback, System.Windows.CoerceValueCallback coerceValueCallback);new System.Windows.FrameworkPropertyMetadata : System.Windows.PropertyChangedCallback * System.Windows.CoerceValueCallback -> System.Windows.FrameworkPropertyMetadataPublic Sub New (propertyChangedCallback As PropertyChangedCallback, coerceValueCallback As CoerceValueCallback)Parameters
- propertyChangedCallback
- PropertyChangedCallback
A reference to a handler implementation that the property system will call whenever the effective value of the property changes.
- coerceValueCallback
- CoerceValueCallback
A reference to a handler implementation will be called whenever the property system calls CoerceValue(DependencyProperty) for this dependency property.
Examples
The following example calls this constructor signature:
static FrameworkPropertyMetadata fpm;
fpm = new FrameworkPropertyMetadata(
new PropertyChangedCallback(OnCurrentReadingChanged),
new CoerceValueCallback(CoerceCurrentReading)
);
Remarks
This implementation calls a base initializer and then adds the coerceValueCallback by setting the property on the base instance.
See also
Applies to
FrameworkPropertyMetadata(Object, FrameworkPropertyMetadataOptions, PropertyChangedCallback)
Initializes a new instance of the FrameworkPropertyMetadata class with the provided default value and framework metadata options, and specified PropertyChangedCallback callback.
public:
FrameworkPropertyMetadata(System::Object ^ defaultValue, System::Windows::FrameworkPropertyMetadataOptions flags, System::Windows::PropertyChangedCallback ^ propertyChangedCallback);public FrameworkPropertyMetadata (object defaultValue, System.Windows.FrameworkPropertyMetadataOptions flags, System.Windows.PropertyChangedCallback propertyChangedCallback);new System.Windows.FrameworkPropertyMetadata : obj * System.Windows.FrameworkPropertyMetadataOptions * System.Windows.PropertyChangedCallback -> System.Windows.FrameworkPropertyMetadataPublic Sub New (defaultValue As Object, flags As FrameworkPropertyMetadataOptions, propertyChangedCallback As PropertyChangedCallback)Parameters
- defaultValue
- Object
The default value of the dependency property, usually provided as a value of a specific type.
The metadata option flags (a combination of FrameworkPropertyMetadataOptions values). These options specify characteristics of the dependency property that interact with systems such as layout or data binding.
- propertyChangedCallback
- PropertyChangedCallback
A reference to a handler implementation that the property system will call whenever the effective value of the property changes.
Exceptions
defaultValue is set to UnsetValue.
Examples
The following example calls this constructor signature:
static FrameworkPropertyMetadata fpm;
fpm = new FrameworkPropertyMetadata(
Double.NaN,
(FrameworkPropertyMetadataOptions.AffectsRender |
FrameworkPropertyMetadataOptions.BindsTwoWayByDefault),
new PropertyChangedCallback(OnCurrentReadingChanged)
);
Remarks
The type of the value provided for defaultValue must match or be related to the type specified in the original registration of the dependency property that this metadata will be applied to. Mismatches between metadata default value type and the type of the dependency property it is being applied to can be difficult to debug, because the mismatch is not detectable during compilation. The property system does not evaluate the effective value of a property until run time, so the result of a default value type/property type mismatch is a run-time error.
The value UnsetValue has special meaning in the property system, and cannot be used as a dependency property default value.
Values marked as set flags in the flags parameter will set the Boolean value of FrameworkPropertyMetadata properties that match that FrameworkPropertyMetadataOptions flag's name to true. You can still change the values of the properties in the metadata, as long as the metadata has not yet been applied to a specific property system operation.
See also
Applies to
FrameworkPropertyMetadata(Object, PropertyChangedCallback, CoerceValueCallback)
Initializes a new instance of the FrameworkPropertyMetadata class with the provided default value and specified callbacks.
public:
FrameworkPropertyMetadata(System::Object ^ defaultValue, System::Windows::PropertyChangedCallback ^ propertyChangedCallback, System::Windows::CoerceValueCallback ^ coerceValueCallback);public FrameworkPropertyMetadata (object defaultValue, System.Windows.PropertyChangedCallback propertyChangedCallback, System.Windows.CoerceValueCallback coerceValueCallback);new System.Windows.FrameworkPropertyMetadata : obj * System.Windows.PropertyChangedCallback * System.Windows.CoerceValueCallback -> System.Windows.FrameworkPropertyMetadataPublic Sub New (defaultValue As Object, propertyChangedCallback As PropertyChangedCallback, coerceValueCallback As CoerceValueCallback)Parameters
- defaultValue
- Object
The default value of the dependency property, usually provided as a specific type.
- propertyChangedCallback
- PropertyChangedCallback
A reference to a handler implementation that the property system will call whenever the effective value of the property changes.
- coerceValueCallback
- CoerceValueCallback
A reference to a handler implementation that will be called whenever the property system calls CoerceValue(DependencyProperty) for this dependency property.
Exceptions
defaultValue is set to UnsetValue.
Examples
The following example calls this constructor signature:
static FrameworkPropertyMetadata fpm;
fpm = new FrameworkPropertyMetadata(
Double.NaN,
new PropertyChangedCallback(OnCurrentReadingChanged),
new CoerceValueCallback(CoerceCurrentReading)
);
Remarks
The type of the value provided for defaultValue must match or be related to the type specified in the original registration of the dependency property that this metadata will be applied to. Mismatches between metadata default value type and the type of the dependency property it is being applied to can be difficult to debug, because the mismatch is not detectable during compilation. The property system does not evaluate the effective value of a property until run time, so the result of a default value type/property type mismatch is a run-time error.
The value UnsetValue has special meaning in the property system, and cannot be used as a dependency property default value.
See also
Applies to
FrameworkPropertyMetadata(Object, FrameworkPropertyMetadataOptions, PropertyChangedCallback, CoerceValueCallback)
Initializes a new instance of the FrameworkPropertyMetadata class with the provided default value and framework metadata options, and specified callbacks.
public:
FrameworkPropertyMetadata(System::Object ^ defaultValue, System::Windows::FrameworkPropertyMetadataOptions flags, System::Windows::PropertyChangedCallback ^ propertyChangedCallback, System::Windows::CoerceValueCallback ^ coerceValueCallback);public FrameworkPropertyMetadata (object defaultValue, System.Windows.FrameworkPropertyMetadataOptions flags, System.Windows.PropertyChangedCallback propertyChangedCallback, System.Windows.CoerceValueCallback coerceValueCallback);new System.Windows.FrameworkPropertyMetadata : obj * System.Windows.FrameworkPropertyMetadataOptions * System.Windows.PropertyChangedCallback * System.Windows.CoerceValueCallback -> System.Windows.FrameworkPropertyMetadataPublic Sub New (defaultValue As Object, flags As FrameworkPropertyMetadataOptions, propertyChangedCallback As PropertyChangedCallback, coerceValueCallback As CoerceValueCallback)Parameters
- defaultValue
- Object
The default value of the dependency property, usually provided as a specific type.
The metadata option flags (a combination of FrameworkPropertyMetadataOptions values). These options specify characteristics of the dependency property that interact with systems such as layout or data binding.
- propertyChangedCallback
- PropertyChangedCallback
A reference to a handler implementation that the property system will call whenever the effective value of the property changes.
- coerceValueCallback
- CoerceValueCallback
A reference to a handler implementation that will be called whenever the property system calls CoerceValue(DependencyProperty) against this property.
Exceptions
defaultValue is set to UnsetValue.
Examples
The following example calls this constructor signature:
static FrameworkPropertyMetadata fpm;
fpm = new FrameworkPropertyMetadata(
Double.NaN,
(FrameworkPropertyMetadataOptions.AffectsRender |
FrameworkPropertyMetadataOptions.BindsTwoWayByDefault),
new PropertyChangedCallback(OnCurrentReadingChanged),
new CoerceValueCallback(CoerceCurrentReading)
);
Remarks
The type of the value provided for defaultValue must match or be related to the type specified in the original registration of the dependency property that this metadata will be applied to. Mismatches between metadata default value type and the type of the dependency property it is being applied to can be difficult to debug, because the mismatch is not detectable during compilation. The property system does not evaluate the effective value of a property until run time, so the result of a default value type/property type mismatch is a run-time error.
The value UnsetValue has special meaning in the property system, and cannot be used as a dependency property default value.
Values marked as set flags in the flags parameter will set the Boolean value of FrameworkPropertyMetadata properties that match that FrameworkPropertyMetadataOptions flag's name to true. You can still change the values of the properties in the metadata, as long as the metadata has not yet been applied to a specific property system operation.
See also
Applies to
FrameworkPropertyMetadata(Object, FrameworkPropertyMetadataOptions, PropertyChangedCallback, CoerceValueCallback, Boolean)
Initializes a new instance of the FrameworkPropertyMetadata class with the provided default value and framework metadata options, specified callbacks, and a Boolean that can be used to prevent animation of the property.
public:
FrameworkPropertyMetadata(System::Object ^ defaultValue, System::Windows::FrameworkPropertyMetadataOptions flags, System::Windows::PropertyChangedCallback ^ propertyChangedCallback, System::Windows::CoerceValueCallback ^ coerceValueCallback, bool isAnimationProhibited);public FrameworkPropertyMetadata (object defaultValue, System.Windows.FrameworkPropertyMetadataOptions flags, System.Windows.PropertyChangedCallback propertyChangedCallback, System.Windows.CoerceValueCallback coerceValueCallback, bool isAnimationProhibited);new System.Windows.FrameworkPropertyMetadata : obj * System.Windows.FrameworkPropertyMetadataOptions * System.Windows.PropertyChangedCallback * System.Windows.CoerceValueCallback * bool -> System.Windows.FrameworkPropertyMetadataPublic Sub New (defaultValue As Object, flags As FrameworkPropertyMetadataOptions, propertyChangedCallback As PropertyChangedCallback, coerceValueCallback As CoerceValueCallback, isAnimationProhibited As Boolean)Parameters
- defaultValue
- Object
The default value of the dependency property, usually provided as a specific type.
The metadata option flags (a combination of FrameworkPropertyMetadataOptions values). These options specify characteristics of the dependency property that interact with systems such as layout or data binding.
- propertyChangedCallback
- PropertyChangedCallback
A reference to a handler implementation that the property system will call whenever the effective value of the property changes.
- coerceValueCallback
- CoerceValueCallback
A reference to a handler implementation that will be called whenever the property system calls CoerceValue(DependencyProperty) on this dependency property.
- isAnimationProhibited
- Boolean
true to prevent the property system from animating the property that this metadata is applied to. Such properties will raise a run-time exception originating from the property system if animations of them are attempted. false to permit animating the property. The default is false.
Exceptions
defaultValue is set to UnsetValue.
Examples
The following example calls this constructor signature:
static FrameworkPropertyMetadata fpm;
fpm = new FrameworkPropertyMetadata(
Double.NaN,
(FrameworkPropertyMetadataOptions.AffectsRender |
FrameworkPropertyMetadataOptions.BindsTwoWayByDefault),
new PropertyChangedCallback(OnCurrentReadingChanged),
new CoerceValueCallback(CoerceCurrentReading),
true //Animation prohibited
);
Remarks
The type of the value provided for defaultValue must match or be related to the type specified in the original registration of the dependency property that this metadata will be applied to. Mismatches between metadata default value type and the type of the dependency property it is being applied to can be difficult to debug, because the mismatch is not detectable during compilation. The property system does not evaluate the effective value of a property until run time, so the result of a default value type/property type mismatch is a run-time error.
The value UnsetValue has special meaning in the property system, and cannot be used as a dependency property default value.
The isAnimationProhibited parameter sets the initial value of the IsAnimationProhibited property declared by the immediate base UIPropertyMetadata class.
Values marked as set flags in the flags parameter will set the Boolean value of FrameworkPropertyMetadata properties that match that FrameworkPropertyMetadataOptions flag's name to true. You can still change the values of the properties in the metadata, as long as the metadata has not yet been applied to a specific property system operation.
See also
Applies to
FrameworkPropertyMetadata(Object, FrameworkPropertyMetadataOptions, PropertyChangedCallback, CoerceValueCallback, Boolean, UpdateSourceTrigger)
Initializes a new instance of the FrameworkPropertyMetadata class with the provided default value and framework metadata options, specified callbacks, a Boolean that can be used to prevent animation of the property, and a data-binding update trigger default.
public:
FrameworkPropertyMetadata(System::Object ^ defaultValue, System::Windows::FrameworkPropertyMetadataOptions flags, System::Windows::PropertyChangedCallback ^ propertyChangedCallback, System::Windows::CoerceValueCallback ^ coerceValueCallback, bool isAnimationProhibited, System::Windows::Data::UpdateSourceTrigger defaultUpdateSourceTrigger);public FrameworkPropertyMetadata (object defaultValue, System.Windows.FrameworkPropertyMetadataOptions flags, System.Windows.PropertyChangedCallback propertyChangedCallback, System.Windows.CoerceValueCallback coerceValueCallback, bool isAnimationProhibited, System.Windows.Data.UpdateSourceTrigger defaultUpdateSourceTrigger);new System.Windows.FrameworkPropertyMetadata : obj * System.Windows.FrameworkPropertyMetadataOptions * System.Windows.PropertyChangedCallback * System.Windows.CoerceValueCallback * bool * System.Windows.Data.UpdateSourceTrigger -> System.Windows.FrameworkPropertyMetadataPublic Sub New (defaultValue As Object, flags As FrameworkPropertyMetadataOptions, propertyChangedCallback As PropertyChangedCallback, coerceValueCallback As CoerceValueCallback, isAnimationProhibited As Boolean, defaultUpdateSourceTrigger As UpdateSourceTrigger)Parameters
- defaultValue
- Object
The default value of the dependency property, usually provided as a specific type.
The metadata option flags (a combination of FrameworkPropertyMetadataOptions values). These options specify characteristics of the dependency property that interact with systems such as layout or data binding.
- propertyChangedCallback
- PropertyChangedCallback
A reference to a handler implementation that the property system will call whenever the effective value of the property changes.
- coerceValueCallback
- CoerceValueCallback
A reference to a handler implementation that will be called whenever the property system calls CoerceValue(DependencyProperty) against this property.
- isAnimationProhibited
- Boolean
true to prevent the property system from animating the property that this metadata is applied to. Such properties will raise a run-time exception originating from the property system if animations of them are attempted. The default is false.
- defaultUpdateSourceTrigger
- UpdateSourceTrigger
The UpdateSourceTrigger to use when bindings for this property are applied that have their UpdateSourceTrigger set to Default.
Exceptions
defaultValue is set to UnsetValue.
Examples
static FrameworkPropertyMetadata fpm;
fpm = new FrameworkPropertyMetadata(
Double.NaN,
(FrameworkPropertyMetadataOptions.AffectsRender |
FrameworkPropertyMetadataOptions.BindsTwoWayByDefault),
new PropertyChangedCallback(OnCurrentReadingChanged),
new CoerceValueCallback(CoerceCurrentReading),
true //Animation prohibited
, UpdateSourceTrigger.PropertyChanged
);
Remarks
The type of the value provided for defaultValue must match or be related to the type specified in the original registration of the dependency property that this metadata will be applied to. Mismatches between metadata default value type and the type of the dependency property it is being applied to can be difficult to debug, because the mismatch is not detectable during compilation. The property system does not evaluate the effective value of a property until run time, so the result of a default value type/property type mismatch is a run-time error.
The value UnsetValue has special meaning in the property system, and cannot be used as a dependency property default value.
The isAnimationProhibited parameter sets the initial value of the IsAnimationProhibited property declared by the immediate base UIPropertyMetadata class.
For more information about the update source behavior for bindings, see Data Binding Overview.
Values marked as set flags in the flags parameter will set the Boolean value of FrameworkPropertyMetadata properties that match that FrameworkPropertyMetadataOptions flag's name to true. You can still change the values of the properties in the metadata, as long as the metadata has not yet been applied to a specific property system operation.
