Исходный код вики Добавление ссылки после создания Activity
Версия 1.2 от Alexandr Fokin на 2022/12/06 17:44
Последние авторы
author | version | line-number | content |
---|---|---|---|
1 | [[Reflection | Рефлексия>>doc:Разработка.NET.C#.Рантайм и типы.Reflection | Рефлексия .WebHome]] | ||
2 | |||
3 | [[Expression tree>>doc:Разработка.NET.C#.Рантайм и типы.Expression tree.WebHome]] | ||
4 | |||
5 | ---- | ||
6 | |||
7 | {{code language="c#"}} | ||
8 | public static class ActivityExtensions | ||
9 | { | ||
10 | private static readonly Action<Activity, ActivityLink> ActivityAddLink1; | ||
11 | private static readonly Action<Activity, ActivityLink> ActivityAddLink2; | ||
12 | |||
13 | static ActivityExtensions() | ||
14 | { | ||
15 | var activityType = typeof(Activity); | ||
16 | var linkType = typeof(ActivityLink); | ||
17 | |||
18 | var linksField = activityType.GetField( | ||
19 | name: "_links", | ||
20 | bindingAttr: BindingFlags.Instance | BindingFlags.NonPublic | ||
21 | )!; | ||
22 | |||
23 | var collectionType = linksField.FieldType; | ||
24 | var collectionAddMethod = collectionType.GetMethod( | ||
25 | name: "Add", | ||
26 | bindingAttr: BindingFlags.Instance | BindingFlags.Public | ||
27 | )!; | ||
28 | |||
29 | |||
30 | { | ||
31 | var constructorMethod = collectionType.GetConstructor( | ||
32 | types: linkType.OneItemArray() | ||
33 | )!; | ||
34 | |||
35 | |||
36 | ActivityAddLink2 = (a, e) => | ||
37 | { | ||
38 | var parameter = ((object)e).OneItemArray(); | ||
39 | var collection = linksField.GetValue(a); | ||
40 | |||
41 | if (collection == null) | ||
42 | { | ||
43 | collection = constructorMethod.Invoke(parameter); | ||
44 | linksField.SetValue(a, collection); | ||
45 | } | ||
46 | else | ||
47 | { | ||
48 | collectionAddMethod.Invoke( | ||
49 | collection, | ||
50 | parameter | ||
51 | ); | ||
52 | } | ||
53 | }; | ||
54 | } | ||
55 | |||
56 | { | ||
57 | var constructorMethod = collectionType.GetConstructor( | ||
58 | types: linkType.OneItemArray() | ||
59 | )!; | ||
60 | |||
61 | |||
62 | var activityParameter = Expression.Parameter(activityType); | ||
63 | var linkParameter = Expression.Parameter(linkType); | ||
64 | |||
65 | |||
66 | var collectionExp = Expression.Field(activityParameter, linksField); | ||
67 | |||
68 | var addExp = Expression.Call(collectionExp, collectionAddMethod, linkParameter); | ||
69 | |||
70 | var constructorExp = Expression.New(constructorMethod, linkParameter); | ||
71 | var constructorAndSetExp = Expression.Assign(collectionExp, constructorExp); | ||
72 | |||
73 | |||
74 | var addMethodLambda = Expression.Lambda<Action<Activity, ActivityLink>>( | ||
75 | body: addExp, | ||
76 | parameters: new ParameterExpression[] { activityParameter, linkParameter } | ||
77 | ); | ||
78 | var createCollectionMethodLambda = Expression.Lambda<Action<Activity, ActivityLink>>( | ||
79 | body: constructorAndSetExp, | ||
80 | parameters: new ParameterExpression[] { activityParameter, linkParameter } | ||
81 | ); | ||
82 | |||
83 | |||
84 | Action<Activity, ActivityLink> addMethod = addMethodLambda.Compile(); | ||
85 | Action<Activity, ActivityLink> createCollectionMethod = createCollectionMethodLambda.Compile(); | ||
86 | |||
87 | |||
88 | |||
89 | ActivityAddLink1 = (a, e) => | ||
90 | { | ||
91 | if (a.Links.Any()) | ||
92 | { | ||
93 | addMethod(a, e); | ||
94 | } | ||
95 | else | ||
96 | { | ||
97 | createCollectionMethod(a, e); | ||
98 | } | ||
99 | }; | ||
100 | } | ||
101 | } | ||
102 | |||
103 | [Obsolete] | ||
104 | public static void AddLink( | ||
105 | this Activity activity, | ||
106 | in ActivityLink link | ||
107 | ) | ||
108 | { | ||
109 | ActivityAddLink1( | ||
110 | activity, | ||
111 | link | ||
112 | ); | ||
113 | } | ||
114 | |||
115 | public static void AddLink( | ||
116 | this Activity activity, | ||
117 | Activity linkActivity, | ||
118 | params (string Key, string Value)[] tags | ||
119 | ) | ||
120 | { | ||
121 | var link = new ActivityLink( | ||
122 | linkActivity.Context, | ||
123 | new ActivityTagsCollection( | ||
124 | tags.Select( | ||
125 | e => new KeyValuePair<string, object?>(e.Key, e.Value) | ||
126 | ) | ||
127 | ) | ||
128 | ); | ||
129 | |||
130 | AddLink( | ||
131 | activity, | ||
132 | link | ||
133 | ); | ||
134 | } | ||
135 | } | ||
136 | {{/code}} |