C++ C#

ItemObjectView<I> Class

API Reference

Namespace: Semata.DataStore.ObjectModel.Views

Abstract base class for all ItemObjectViews.

Many of the ItemObjectView properties will be the same as that of the ItemObject. However, the PropertyChanged events of the ItemObject cannot just be forwarded as some of the ItemObjectView properties may need to perform processing before the event is passed on. Instead PropertyChanged and PropertyWritten events from the ItemObject cause a PropertySourceChanged to be raised. The properties ubscribe to this event, perform the necessary processin , and then raise the PropertyChanged event.

public abstract class ItemObjectView<I> : ItemObjectView , IEditableData , IEditableObject , INotifyPropertySourceChanged , IValidatableObject , IEquatable<ItemObjectView<I>> where I : ItemObject

Inherits: ItemObjectView

Implements: IEditableData , IEditableObject , INotifyPropertySourceChanged , MISSING PAGE IValidatableObject , IEquatable<ItemObjectView<I>>

Constructors

Name Description
ItemObjectView()

Default constructor, mainly used controls, such as DataGrid, that require it for their new object logic

ItemObjectView(I, bool, bool)

Creates new ItemObjectView from an ItemObject

ItemObjectView(ItemObjectView<I>, bool, bool)

Creates new ItemObjectView from another ItemObjectVew

Events

Name Description
ErrorsChanged

Occurs when the erros on the viewed ItemObject changes

PropertyChanged

Occurs when a property value changes.

PropertySourceChanged

Occurs whenever the source of the view raises PropertyChanged and UsesPropertyChange is true, or PropertyWritten is raised

StateChanged

Occurs when the value changes of any property.

Properties

Name Description
DataName

The name of the underlying Item (IEditableData)

HasErrors

Gets a value that indicates whether the entity has validation errors.

IsChanged

Are there any changes to properties that have not been written to the DataStore?

IsDeleted

Has this ItemObject been deleted?

IsInitialized

Has the been initialized. In other words does the property ItemObject not null

IsNew

Is the ItemObject new? In other words, has been written to the DataStore.

ItemObject

Returns the viewed ItemObject

UsesPropertyChanged

True if the ItemObjectView subscribes to the PropertyChanged event of the ItemObject

WriteOnEndEdit

True if Write will be called on EndEdit

operator

Returns false if both views are null, or are views of the same ItemObject

Methods

Name Description
BeginEdit()

Starts editing

CanDelete()

Determines if the viewed ItemObject can be deleted

CancelEdit()

Cancels the edits on the ItemObject

ClearErrors()

Clear all errors on the ItemObject.

ClearErrors(string)

Clear errors for specified property name.

Delete()

Delete Item from DataStore

EndEdit()

If WriteOnEdit is true calls Write, otherwise call ItemObject.Validate()

Equals(ItemObjectView<I>)

Returns true if other is a view of the same ItemObject

Equals(object)

Returns true if obj is a view of the same ItemObject

GetErrors()

Get all errors on the ItemObject.

GetErrors(string)

Gets the validation errors for a specified property or for the entire object.

GetHashCode()

Returns the HasCode of the viewed ItemObject

Initialize(ItemObjectView<I>)

Initializes the view from a view based on the same ItemObject

NotifyErrorsChanged(DataErrorsChangedEventArgs)

Raises event ErrorsChanged

NotifyPropertyChanged(PropertyChangedEventArgs)

Raises event PropertyChanged

NotifyPropertySourceChanged(PropertyChangedEventArgs)

Raises event PropertySourceChanged

NotifyStateChanged(EventArgs)

Raises event StateChanged

Validate()

Validates the viewed ItemObject

Write()

Writes the viewed ItemObject

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