IMapView<K, V> IMapView<K, V> IMapView<K, V> IMapView<K, V> Interface
Definition
Represents an immutable view into a map.
.NET This interface appears as System.Collections.Generic.IReadOnlyDictionary<TKey,TValue> due to .NET language projection. In any case where a Windows Runtime type has implemented IMapView;, .NET code can use the APIs of IReadOnlyDictionary<TKey,TValue> instead.
public : interface IMapView<K, V>public interface IMapView<K, V>Public Interface IMapView<K, V>// You can use this interface in JavaScript.
- Attributes
| Device family |
Windows 10 (introduced v10.0.10240.0)
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| API contract |
Windows.Foundation.FoundationContract (introduced v1)
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Remarks
When programming with .NET, this interface is hidden and developers should use the System.Collections.Generic.IReadOnlyDictionary<TKey,TValue> interface if they want to implement a read-only map/dictionary type. In any case where a Windows Runtime type has implemented IMapView;, .NET code can use the APIs of IReadOnlyDictionary<TKey,TValue> instead. This includes all the existing Windows Runtime API and also scenarios such as using the APIs of Windows Runtime components originally implemented in Visual C++ component extensions (C++/CX) from a C# or Visual Basic app.
The IMapView; interface represents a collection of key-value pairs where a value can be accessed by its associated key. Properties and methods of IMapView; support dictionary-type functionality, such as getting the size of the collection, or lookups, but don't support adding or removing items because the map is read-only.
Interface inheritance
IMapView inherits IIterable, using an IKeyValuePair constraint. Types that implement IMapView also implement the interface members of IKeyValuePair, with an IKeyValuePair type constraint. Similarly, if you're using .NET, there is support for IEnumerable<T>, with its constraint type as a KeyValuePair that uses the same key and value types as does the IReadOnlyDictionary<TKey,TValue> implementation.
Properties
Size Size Size Size
Gets the number of elements in the map.
public : unsigned short Size { get; }public uint Size { get; }Public ReadOnly Property Size As uint// You can use this property in JavaScript.
- Value
- unsigned short uint uint uint
The number of elements in the map.
Remarks
When programming with .NET, this interface is hidden and developers should use the System.Collections.Generic.IReadOnlyDictionary<TKey,TValue> interface.
- See Also
Methods
HasKey(K) HasKey(K) HasKey(K) HasKey(K)
Determines whether the map view contains the specified key.
public : PlatForm::Boolean HasKey(K key)public bool HasKey(K key)Public Function HasKey(key As K) As bool// You can use this method in JavaScript.
- key
- K K K K
The key to locate in the map view.
True if the key is found; otherwise, false.
Remarks
When programming with .NET, this interface is hidden and developers should use the System.Collections.Generic.IReadOnlyDictionary<TKey,TValue> interface.
- See Also
Lookup(K) Lookup(K) Lookup(K) Lookup(K)
Returns the item at the specified key in the map view.
public : V Lookup(K key)public V Lookup(K key)Public Function Lookup(key As K) As V// You can use this method in JavaScript.
- key
- K K K K
The key to locate in the map view.
The value, if an item with the specified key exists. Use the HasKey method to determine whether the key exists.
Remarks
When programming with .NET, this interface is hidden and developers should use the System.Collections.Generic.IReadOnlyDictionary<TKey,TValue> interface.
- See Also
Split(IMapView<K, V>, IMapView<K, V>) Split(IMapView<K, V>, IMapView<K, V>) Split(IMapView<K, V>, IMapView<K, V>) Split(IMapView<K, V>, IMapView<K, V>)
Splits the map view into two views.
public : void Split(IMapView<K, V> first, IMapView<K, V> second)public void Split(IReadOnlyDictionary<K, V> first, IReadOnlyDictionary<K, V> second)Public Function Split(first As IReadOnlyDictionary<K, V>, second As IReadOnlyDictionary<K, V>) As void// You can use this method in JavaScript.
- first
- IMapView<K, V> IReadOnlyDictionary<K, V> IReadOnlyDictionary<K, V> IReadOnlyDictionary<K, V>
One half of the original map.
- second
- IMapView<K, V> IReadOnlyDictionary<K, V> IReadOnlyDictionary<K, V> IReadOnlyDictionary<K, V>
The second half of the original map.
Remarks
When programming with .NET, this interface is hidden and developers should use the System.Collections.Generic.IReadOnlyDictionary<TKey,TValue> interface.
The two views that result from the split operation may not contain the same number of items. The two views do not overlap.
If the IMapView, V> instance cannot be split, then both the first and second parameters are null when the method returns.
- See Also