1 | #Region "Microsoft.VisualBasic::b14bc5436ac6578fc064be651c3862a6, Microsoft.VisualBasic.Core\Extensions\Reflection\Delegate\TypeExtensions.vb" |
2 | |
3 | ' Author: |
4 | ' |
5 | ' asuka (amethyst.asuka@gcmodeller.org) |
6 | ' xie (genetics@smrucc.org) |
7 | ' xieguigang (xie.guigang@live.com) |
8 | ' |
9 | ' Copyright (c) 2018 GPL3 Licensed |
10 | ' |
11 | ' |
12 | ' GNU GENERAL PUBLIC LICENSE (GPL3) |
13 | ' |
14 | ' |
15 | ' This program is free software: you can redistribute it and/or modify |
16 | ' it under the terms of the GNU General Public License as published by |
17 | ' the Free Software Foundation, either version 3 of the License, or |
18 | ' (at your option) any later version. |
19 | ' |
20 | ' This program is distributed in the hope that it will be useful, |
21 | ' but WITHOUT ANY WARRANTY; without even the implied warranty of |
22 | ' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
23 | ' GNU General Public License for more details. |
24 | ' |
25 | ' You should have received a copy of the GNU General Public License |
26 | ' along with this program. If not, see <http://www.gnu.org/licenses/>. |
27 | |
28 | |
29 | |
30 | ' /********************************************************************************/ |
31 | |
32 | ' Summaries: |
33 | |
34 | ' Module TypeExtensions |
35 | ' |
36 | ' Function: CanBeAssignedFrom, ImplementInterface |
37 | ' |
38 | ' |
39 | ' /********************************************************************************/ |
40 | |
41 | #End Region |
42 | |
43 | Imports System.Runtime.CompilerServices |
44 | |
45 | Namespace Emit.Delegates |
46 | |
47 | Public Module TypeExtensions |
48 | |
49 | ''' <summary> |
50 | ''' <paramref name="source"/>能否转换至<paramref name="destination"/>类型? |
51 | ''' </summary> |
52 | ''' <param name="destination"></param> |
53 | ''' <param name="source"></param> |
54 | ''' <returns></returns> |
55 | <Extension> |
56 | Public Function CanBeAssignedFrom(destination As Type, source As Type) As Boolean |
57 | If source Is Nothing OrElse destination Is Nothing Then |
58 | Return False |
59 | End If |
60 | |
61 | If destination Is source OrElse source.IsSubclassOf(destination) Then |
62 | Return True |
63 | End If |
64 | |
65 | If destination.IsInterface Then |
66 | Return source.ImplementInterface(destination) |
67 | End If |
68 | |
69 | If Not destination.IsGenericParameter Then |
70 | Return False |
71 | End If |
72 | |
73 | Dim constraints = destination.GetGenericParameterConstraints() |
74 | Return constraints.All(Function(t1) t1.CanBeAssignedFrom(source)) |
75 | End Function |
76 | |
77 | ''' <summary> |
78 | ''' 目标类型<paramref name="source"/>是否实现了制定的接口类型? |
79 | ''' </summary> |
80 | ''' <param name="source"></param> |
81 | ''' <param name="interfaceType">接口类型信息</param> |
82 | ''' <returns></returns> |
83 | <Extension> Public Function ImplementInterface(source As Type, interfaceType As Type) As Boolean |
84 | While source IsNot Nothing |
85 | Dim interfaces = source.GetInterfaces() |
86 | If interfaces.Any(Function(i) i Is interfaceType OrElse i.ImplementInterface(interfaceType)) Then |
87 | Return True |
88 | End If |
89 | |
90 | source = source.BaseType |
91 | End While |
92 | |
93 | Return False |
94 | End Function |
95 | End Module |
96 | End Namespace |