Class ViewModelBase

A base class for implementing models that fire notifications when their properties change. This class is ideal for implementing MVVM driven UIs.

Inheritance

Object

ViewModelBase

Namespace: Swan

Syntax

public abstract class ViewModelBase : INotifyPropertyChanged

Constructors

ViewModelBase()

Initializes a new instance of the ViewModelBase class.

Declaration

protected ViewModelBase()

ViewModelBase(Boolean)

Initializes a new instance of the ViewModelBase class.

Declaration

protected ViewModelBase(bool useDeferredNotifications)

Parameters

Type	Name	Description
Boolean	useDeferredNotifications	Set to true to use deferred notifications in the background.

Methods

NotifyPropertyChanged(String[])

Notifies one or more properties changed.

Declaration

protected void NotifyPropertyChanged(params string[] propertyNames)

Parameters

Type	Name	Description
String[]	propertyNames	The property names.

SetProperty<T>(ref T, T, String, String[])

Checks if a property already matches a desired value. Sets the property and notifies listeners only when necessary.

Declaration

protected bool SetProperty<T>(ref T storage, T value, string propertyName = "", string[] notifyAlso = null)

Parameters

Type	Name	Description
T	storage	Reference to a property with both getter and setter.
T	value	Desired value for the property.
String	propertyName	Name of the property used to notify listeners. This value is optional and can be provided automatically when invoked from compilers that support CallerMemberName.
String[]	notifyAlso	An array of property names to notify in addition to notifying the changes on the current property name.

Returns

Type	Description
Boolean	True if the value was changed, false if the existing value matched the desired value.

Type Parameters

Name	Description
T	Type of the property.

Events

PropertyChanged

Declaration

public event PropertyChangedEventHandler PropertyChanged

Event Type

Type	Description
PropertyChangedEventHandler

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