115 lines
4.4 KiB
VB.net
115 lines
4.4 KiB
VB.net
#Region "Microsoft.VisualBasic::749bbcaeebecf045cf882ac170b0ef86, Microsoft.VisualBasic.Core\Extensions\Collection\Linq\Enumeration.vb"
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' Author:
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'
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' asuka (amethyst.asuka@gcmodeller.org)
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' xie (genetics@smrucc.org)
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' xieguigang (xie.guigang@live.com)
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'
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' Copyright (c) 2018 GPL3 Licensed
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'
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'
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' GNU GENERAL PUBLIC LICENSE (GPL3)
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'
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'
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' This program is free software: you can redistribute it and/or modify
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' it under the terms of the GNU General Public License as published by
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' the Free Software Foundation, either version 3 of the License, or
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' (at your option) any later version.
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'
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' This program is distributed in the hope that it will be useful,
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' but WITHOUT ANY WARRANTY; without even the implied warranty of
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' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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' GNU General Public License for more details.
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'
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' You should have received a copy of the GNU General Public License
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' along with this program. If not, see <http://www.gnu.org/licenses/>.
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' /********************************************************************************/
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' Summaries:
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' Interface Enumeration
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'
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' Function: GenericEnumerator, GetEnumerator
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'
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' Module EnumerationExtensions
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'
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' Function: AsEnumerable
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' Class Enumerator
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'
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' Function: GetEnumerator, IEnumerable_GetEnumerator
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'
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'
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'
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'
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' /********************************************************************************/
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#End Region
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Imports System.Runtime.CompilerServices
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Namespace Linq
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''' <summary>
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''' Exposes the enumerator, which supports a simple iteration over a collection of
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''' a specified type.To browse the .NET Framework source code for this type, see
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''' the Reference Source.
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''' (使用这个的原因是系统自带的<see cref="IEnumerable(Of T)"/>在Xml序列化之中的支持不太友好，
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''' 实现这个接口之后可以通过<see cref="EnumerationExtensions.AsEnumerable(Of T)(Enumeration(Of T))"/>
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''' 拓展来转换为查询操作的数据源)
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''' </summary>
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''' <typeparam name="T">The type of objects to enumerate.This type parameter is covariant. That is, you
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''' can use either the type you specified or any type that is more derived. For more
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''' information about covariance and contravariance, see Covariance and Contravariance
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''' in Generics.</typeparam>
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Public Interface Enumeration(Of T)
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''' <summary>
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''' Returns an enumerator that iterates through the collection.
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''' </summary>
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''' <returns>An enumerator that can be used to iterate through the collection.</returns>
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Function GenericEnumerator() As IEnumerator(Of T)
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''' <summary>
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''' Returns an enumerator that iterates through a collection.
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''' </summary>
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''' <returns>An System.Collections.IEnumerator object that can be used to iterate through
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''' the collection.</returns>
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Function GetEnumerator() As IEnumerator
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End Interface
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Public Module EnumerationExtensions
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Private Class Enumerator(Of T) : Implements IEnumerable(Of T)
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Public Enumeration As Enumeration(Of T)
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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Public Function GetEnumerator() As IEnumerator(Of T) Implements IEnumerable(Of T).GetEnumerator
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Return Enumeration.GenericEnumerator
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End Function
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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Private Function IEnumerable_GetEnumerator() As IEnumerator Implements IEnumerable.GetEnumerator
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Return Enumeration.GetEnumerator
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End Function
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End Class
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''' <summary>
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''' Returns the input typed as <see cref="IEnumerable(Of T)"/>.
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''' </summary>
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''' <typeparam name="T">The type of the elements of source.</typeparam>
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''' <param name="enums">The sequence to type as <see cref="IEnumerable(Of T)"/></param>
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''' <returns>The input sequence typed as <see cref="IEnumerable(Of T)"/>.</returns>
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'''
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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<Extension>
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Public Function AsEnumerable(Of T)(enums As Enumeration(Of T)) As IEnumerable(Of T)
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Return New Enumerator(Of T) With {.Enumeration = enums}
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End Function
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End Module
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End Namespace
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