DataServiceCollection<T> Constructors
Definition
Important
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Creates a new instance of the DataServiceCollection<T> class.
Overloads
DataServiceCollection<T>()
Creates a new instance of the DataServiceCollection<T> class.
public:
DataServiceCollection();public DataServiceCollection ();Public Sub New ()Remarks
By default, automatic change tracking is enabled for a DataServiceCollection<T>. You can create an instance of DataServiceCollection<T> that uses manual change tracking when you create an instance using a constructor that enables you to supply a value of None for TrackingMode. When you use manual tracking, you must implement INotifyPropertyChanged and INotifyCollectionChanged and handle the raise events to manually report changes to the DataServiceContext.
Automatic change tracking begins after items are loaded into the collection.
Applies to
DataServiceCollection<T>(IEnumerable<T>)
Creates a new instance of the DataServiceCollection<T> class based on query execution.
public:
DataServiceCollection(System::Collections::Generic::IEnumerable<T> ^ items);public DataServiceCollection (System.Collections.Generic.IEnumerable<T> items);new System.Data.Services.Client.DataServiceCollection<'T> : seq<'T> -> System.Data.Services.Client.DataServiceCollection<'T>Public Sub New (items As IEnumerable(Of T))Parameters
- items
- IEnumerable<T>
A DataServiceQuery<TElement> or LINQ query that returns an IEnumerable<T> collection of objects that are used to initialize the collection.
Remarks
The IEnumerable<T> collection of objects supplied for items is usually a query that returns the items in the collection. However, any IEnumerable<T> collection of the correct type can be supplied.
By default, automatic change tracking is enabled for a DataServiceCollection<T>. You can create an instance of DataServiceCollection<T> that uses manual change tracking when you create an instance using a constructor that enables you to supply a value of None for TrackingMode. When you use manual tracking, you must implement INotifyPropertyChanged and INotifyCollectionChanged and handle the raise events to manually report changes to the DataServiceContext.
Applies to
DataServiceCollection<T>(DataServiceContext)
Creates a new instance of the DataServiceCollection<T> class that uses the specified DataServiceContext.
public:
DataServiceCollection(System::Data::Services::Client::DataServiceContext ^ context);public DataServiceCollection (System.Data.Services.Client.DataServiceContext context);new System.Data.Services.Client.DataServiceCollection<'T> : System.Data.Services.Client.DataServiceContext -> System.Data.Services.Client.DataServiceCollection<'T>Public Sub New (context As DataServiceContext)Parameters
- context
- DataServiceContext
The DataServiceContext used to track changes to objects in the collection.
Remarks
Use this constructor to create an empty DataServiceCollection<T> to which entity objects can be added without executing a query against the service or when an IEnumerable<T> is not available.
By default, automatic change tracking is enabled for a DataServiceCollection<T>. You can create an instance of DataServiceCollection<T> that uses manual change tracking when you create an instance using a constructor that enables you to supply a value of None for TrackingMode. When you use manual tracking, you must implement INotifyPropertyChanged and INotifyCollectionChanged and handle the raise events to manually report changes to the DataServiceContext.
Applies to
DataServiceCollection<T>(IEnumerable<T>, TrackingMode)
Creates a new instance of the DataServiceCollection<T> class based on query execution and with the specified tracking mode.
public:
DataServiceCollection(System::Collections::Generic::IEnumerable<T> ^ items, System::Data::Services::Client::TrackingMode trackingMode);public DataServiceCollection (System.Collections.Generic.IEnumerable<T> items, System.Data.Services.Client.TrackingMode trackingMode);new System.Data.Services.Client.DataServiceCollection<'T> : seq<'T> * System.Data.Services.Client.TrackingMode -> System.Data.Services.Client.DataServiceCollection<'T>Public Sub New (items As IEnumerable(Of T), trackingMode As TrackingMode)Parameters
- items
- IEnumerable<T>
A DataServiceQuery<TElement> or LINQ query that returns an IEnumerable<T> collection of objects that are used to initialize the collection.
- trackingMode
- TrackingMode
A TrackingMode value that indicated whether or not changes made to items in the collection are automatically tracked.
Remarks
By default, automatic change tracking is enabled for a DataServiceCollection<T>. Use this class constructor and supply a value of None for trackingMode to create an instance of DataServiceCollection<T> that uses manual change tracking. When you use manual tracking, you must implement INotifyPropertyChanged and INotifyCollectionChanged and handle the raise events to manually report changes to the DataServiceContext.
The IEnumerable<T> collection of objects supplied for items is usually a query that returns the items in the collection. However, any IEnumerable<T> collection of the correct type can be supplied.
Applies to
DataServiceCollection<T>(DataServiceContext, String, Func<EntityChangedParams,Boolean>, Func<EntityCollectionChangedParams,Boolean>)
Creates a new instance of the DataServiceCollection<T> class with the supplied change method delegates and that uses the specified DataServiceContext.
public:
DataServiceCollection(System::Data::Services::Client::DataServiceContext ^ context, System::String ^ entitySetName, Func<System::Data::Services::Client::EntityChangedParams ^, bool> ^ entityChangedCallback, Func<System::Data::Services::Client::EntityCollectionChangedParams ^, bool> ^ collectionChangedCallback);public DataServiceCollection (System.Data.Services.Client.DataServiceContext context, string entitySetName, Func<System.Data.Services.Client.EntityChangedParams,bool> entityChangedCallback, Func<System.Data.Services.Client.EntityCollectionChangedParams,bool> collectionChangedCallback);new System.Data.Services.Client.DataServiceCollection<'T> : System.Data.Services.Client.DataServiceContext * string * Func<System.Data.Services.Client.EntityChangedParams, bool> * Func<System.Data.Services.Client.EntityCollectionChangedParams, bool> -> System.Data.Services.Client.DataServiceCollection<'T>Public Sub New (context As DataServiceContext, entitySetName As String, entityChangedCallback As Func(Of EntityChangedParams, Boolean), collectionChangedCallback As Func(Of EntityCollectionChangedParams, Boolean))Parameters
- context
- DataServiceContext
The DataServiceContext used to track items in the collection.
- entitySetName
- String
The entity set of the objects in the collection.
- entityChangedCallback
- Func<EntityChangedParams,Boolean>
A delegate that encapsulates a method that is called when an entity changes.
- collectionChangedCallback
- Func<EntityCollectionChangedParams,Boolean>
A delegate that encapsulates a method that is called when the collection of entities changes.
Remarks
Use this constructor to create an empty DataServiceCollection<T> to which entity objects can be added without executing a query against the service or when an IEnumerable<T> is not available.
By default, automatic change tracking is enabled for a DataServiceCollection<T>. You can create an instance of DataServiceCollection<T> that uses manual change tracking when you create an instance using a constructor that enables you to supply a value of None for TrackingMode. When you use manual tracking, you must implement INotifyPropertyChanged and INotifyCollectionChanged and handle the raise events to manually report changes to the DataServiceContext.
Applies to
DataServiceCollection<T>(IEnumerable<T>, TrackingMode, String, Func<EntityChangedParams,Boolean>, Func<EntityCollectionChangedParams,Boolean>)
Creates a new instance of the DataServiceCollection<T> class a based on query execution and with the supplied change method delegates.
public:
DataServiceCollection(System::Collections::Generic::IEnumerable<T> ^ items, System::Data::Services::Client::TrackingMode trackingMode, System::String ^ entitySetName, Func<System::Data::Services::Client::EntityChangedParams ^, bool> ^ entityChangedCallback, Func<System::Data::Services::Client::EntityCollectionChangedParams ^, bool> ^ collectionChangedCallback);public DataServiceCollection (System.Collections.Generic.IEnumerable<T> items, System.Data.Services.Client.TrackingMode trackingMode, string entitySetName, Func<System.Data.Services.Client.EntityChangedParams,bool> entityChangedCallback, Func<System.Data.Services.Client.EntityCollectionChangedParams,bool> collectionChangedCallback);new System.Data.Services.Client.DataServiceCollection<'T> : seq<'T> * System.Data.Services.Client.TrackingMode * string * Func<System.Data.Services.Client.EntityChangedParams, bool> * Func<System.Data.Services.Client.EntityCollectionChangedParams, bool> -> System.Data.Services.Client.DataServiceCollection<'T>Public Sub New (items As IEnumerable(Of T), trackingMode As TrackingMode, entitySetName As String, entityChangedCallback As Func(Of EntityChangedParams, Boolean), collectionChangedCallback As Func(Of EntityCollectionChangedParams, Boolean))Parameters
- items
- IEnumerable<T>
A DataServiceQuery<TElement> or LINQ query that returns an IEnumerable<T> collection of objects that are used to initialize the collection.
- trackingMode
- TrackingMode
A TrackingMode value that indicated whether or not changes made to items in the collection are automatically tracked.
- entitySetName
- String
The entity set of the objects in the collection.
- entityChangedCallback
- Func<EntityChangedParams,Boolean>
A delegate that encapsulates a method that is called when an entity changes.
- collectionChangedCallback
- Func<EntityCollectionChangedParams,Boolean>
A delegate that encapsulates a method that is called when the collection of entities changes.
Remarks
The entityChanged and collectionChanged functions are invoked by the PropertyChanged and CollectionChanged events, respectively. The entityChanged method takes an EntityCollectionChangedParams value and the collectionChanged method takes a EntityChangedParams value. Both methods must return a Boolean value that indicates whether the event was handled by the function. When the method returns true, the default behavior still occurs.
By default, automatic change tracking is enabled for a DataServiceCollection<T>. You can create an instance of DataServiceCollection<T> that uses manual change tracking when you create an instance using a constructor that enables you to supply a value of None for TrackingMode. When you use manual tracking, you must implement INotifyPropertyChanged and INotifyCollectionChanged and handle the raise events to manually report changes to the DataServiceContext.
Applies to
DataServiceCollection<T>(DataServiceContext, IEnumerable<T>, TrackingMode, String, Func<EntityChangedParams,Boolean>, Func<EntityCollectionChangedParams, Boolean>)
Creates a new instance of the DataServiceCollection<T> class a based on query execution, with the supplied change method delegates, and that uses the supplied DataServiceContext.
public:
DataServiceCollection(System::Data::Services::Client::DataServiceContext ^ context, System::Collections::Generic::IEnumerable<T> ^ items, System::Data::Services::Client::TrackingMode trackingMode, System::String ^ entitySetName, Func<System::Data::Services::Client::EntityChangedParams ^, bool> ^ entityChangedCallback, Func<System::Data::Services::Client::EntityCollectionChangedParams ^, bool> ^ collectionChangedCallback);public DataServiceCollection (System.Data.Services.Client.DataServiceContext context, System.Collections.Generic.IEnumerable<T> items, System.Data.Services.Client.TrackingMode trackingMode, string entitySetName, Func<System.Data.Services.Client.EntityChangedParams,bool> entityChangedCallback, Func<System.Data.Services.Client.EntityCollectionChangedParams,bool> collectionChangedCallback);new System.Data.Services.Client.DataServiceCollection<'T> : System.Data.Services.Client.DataServiceContext * seq<'T> * System.Data.Services.Client.TrackingMode * string * Func<System.Data.Services.Client.EntityChangedParams, bool> * Func<System.Data.Services.Client.EntityCollectionChangedParams, bool> -> System.Data.Services.Client.DataServiceCollection<'T>Public Sub New (context As DataServiceContext, items As IEnumerable(Of T), trackingMode As TrackingMode, entitySetName As String, entityChangedCallback As Func(Of EntityChangedParams, Boolean), collectionChangedCallback As Func(Of EntityCollectionChangedParams, Boolean))Parameters
- context
- DataServiceContext
The DataServiceContext used to track items in the collection.
- items
- IEnumerable<T>
A DataServiceQuery<TElement> or LINQ query that returns an IEnumerable<T> collection of objects that are used to initialize the collection.
- trackingMode
- TrackingMode
A TrackingMode value that indicated whether or not changes made to items in the collection are automatically tracked.
- entitySetName
- String
The entity set of the objects in the collection.
- entityChangedCallback
- Func<EntityChangedParams,Boolean>
A delegate that encapsulates a method that is called when an entity changes.
- collectionChangedCallback
- Func<EntityCollectionChangedParams,Boolean>
A delegate that encapsulates a method that is called when the collection of entities changes.
Remarks
By default, automatic change tracking is enabled for a DataServiceCollection<T>. Use this class constructor to supply a value of None for trackingMode to create an instance of DataServiceCollection<T> that uses manual change tracking. When you use manual tracking, you must implement INotifyPropertyChanged and INotifyCollectionChanged and handle the raise events to manually report changes to the DataServiceContext.
The DataServiceContext must be supplied when items is not a DataServiceQuery<TElement> or QueryOperationResponse<T> that has a reference to a DataServiceContext instance.
The entityChanged and collectionChanged functions are invoked by the PropertyChanged and CollectionChanged events, respectively. The entityChanged method takes an EntityCollectionChangedParams value and the collectionChanged method takes a EntityChangedParams value. Both methods must return a Boolean value that indicates whether the event was handled by the function. When the method returns true, the default behavior will still occur.
