ImmutableArray<T>.CastUp<TDerived>(ImmutableArray<TDerived>) 方法

定义

基于现有实例的内容,初始化 ImmutableArray<T> 结构的新实例,允许协变静态转换,以便高效重用现有数组。Initializes a new instance of the ImmutableArray<T> struct based on the contents of an existing instance, allowing a covariant static cast to efficiently reuse the existing array.

public:
generic <typename TDerived>
 where TDerived : class, T static System::Collections::Immutable::ImmutableArray<T> CastUp(System::Collections::Immutable::ImmutableArray<TDerived> items);
public static System.Collections.Immutable.ImmutableArray<T> CastUp<TDerived> (System.Collections.Immutable.ImmutableArray<TDerived> items) where TDerived : class, T;
public static System.Collections.Immutable.ImmutableArray<T> CastUp<TDerived> (System.Collections.Immutable.ImmutableArray<TDerived>? items) where TDerived : class, T;
static member CastUp : System.Collections.Immutable.ImmutableArray<#'T> -> System.Collections.Immutable.ImmutableArray<'T>
Public Shared Function CastUp(Of TDerived As {Class, T}) (items As ImmutableArray(Of TDerived)) As ImmutableArray(Of T)

类型参数

TDerived

要返回的数组元素类型。The type of array element to return.

参数

items
ImmutableArray<TDerived>

用于初始化该数组的数组。The array to initialize the array with. 不创建任何副本。No copy is made.

返回

ImmutableArray<T>

其元素已转换为新类型的不可变数组实例。An immutable array instance with elements cast to the new type.

注解

可以通过调用或方法来反转此方法的协变向上转换 As CastArrayCovariant upcasts from this method may be reversed by calling the As or CastArray method.

适用于