遞歸實現依賴注入

創建所需的依賴服務類

1public?class?Test2{3????public?void?PrintTest()4????{5????????Console.WriteLine("Hello?World");6????}7}89public?class?Test2
10{
11????private?readonly?Test?_test;
12
13????public?Test2(Test?test)
14????{
15????????this._test?=?test;
16????}
17????public?void?PrintTest2()
18????{
19????????_test.PrintTest();
20????}
21}
22
23public?class?Test3
24{
25????private?readonly?Test2?_test2;
26
27????public?Test3(Test2?test2)
28????{
29????????this._test2?=?test2;
30????}
31
32????public?void?PrintTest3()
33????{
34????????_test2.PrintTest2();
35????}
36}

層層遞進之傻瓜式創建實例

1#region??寫法一??無腦new?出實例化對象
2var?test?=?new?Test();
3var?test2?=?new?Test2(test);
4
5test.PrintTest();
6test2.PrintTest2();
7#endregion

層層遞進之反射創建實例

1#region?寫法二??反射創建實例對象
2var?test?=?(Test)Activator.CreateInstance(typeof(Test));
3var?test2?=?(Test2)Activator.CreateInstance(typeof(Test2),?test);
4
5test.PrintTest();
6test2.PrintTest2();
7#endregion

層層遞進之單層有參構造實例

1#region?寫法四??單層有參數構造實例2using?System.Reflection;34var?container?=?new?Container();5container.Add(typeof(Test));6container.Add<Test2>();78var?service?=?new?ContainerService(container);9var?test?=?service.GenerateService<Test>();
10var?test2?=?service.GenerateServiceWithParameter<Test2>();??//?
11test.PrintTest();
12test2.PrintTest2();
13
14#endregion

層次遞進之多層有參構造實例

1#region?多層有參數構造函數實例2using?System.Reflection;34var?container?=?new?Container();5container.Add(typeof(Test));6container.Add<Test2>();7container.Add<Test3>();89var?service?=?new?ContainerService(container);
10var?test?=?service.GenerateService<Test>();
11var?test2?=?service.GenerateServiceWithParameter<Test2>();?
12var?test3?=?service.GenerateServiceComplted<Test3>();?
13test.PrintTest();
14test2.PrintTest2();
15test3.PrintTest3();
16#endregion

容器類生成以及調用

1public?class?ContainerService2{3????private?readonly?Container?_container;45????public?ContainerService(Container?container)6????{7????????this._container?=?container;8????}9
10????public?T?GenerateService<T>()
11????{
12????????var?type?=?_container.GetDependencyType(typeof(T));
13????????//?實例化
14????????return?(T)Activator.CreateInstance(type);
15????}
16
17????///?<summary>
18????///?單層構造參數實例
19????///?</summary>
20????///?<typeparam?name="T"></typeparam>
21????///?<returns></returns>
22????public?T?GenerateServiceWithParameter<T>()
23????{
24????????var?type?=?_container.GetDependencyType(typeof(T));
25????????var?constructor?=?type.GetConstructors().Single();
26????????ParameterInfo[]?paras?=?constructor.GetParameters().ToArray();
27????????if(paras.Length?>?0)
28????????{
29????????????var?arr?=?new?Object[paras.Length];
30????????????for?(int?i?=?0;?i?<?paras.Length;?i++)
31????????????{
32????????????????arr[i]?=?Activator.CreateInstance(paras[i].ParameterType);
33????????????}
34????????????return?(T)Activator.CreateInstance(type,?arr);
35????????}
36????????return?(T)Activator.CreateInstance(type);
37????}
38
39????public?Object?GenerateType(Type?type)
40????{
41????????var?serviceType?=?_container.GetDependencyType(type);
42????????var?constructor?=?serviceType.GetConstructors().Single();
43????????ParameterInfo[]?paras?=?constructor.GetParameters().ToArray();
44????????if?(paras.Length?>?0)
45????????{
46????????????var?arr?=?new?Object[paras.Length];
47????????????for?(int?i?=?0;?i?<?paras.Length;?i++)
48????????????{
49????????????????arr[i]?=?GenerateType(paras[i].ParameterType);
50????????????}
51????????????return?Activator.CreateInstance(serviceType,?arr);
52????????}
53????????return?Activator.CreateInstance(serviceType);
54????}
55
56????public?T?GenerateServiceComplted<T>()
57????{
58????????return?(T)GenerateType(typeof(T));
59????}
60
61}
62
63public?class?Container?
64{
65????List<Type>?_lists;
66
67????public?Container()
68????{
69????????_lists?=?new?List<Type>();
70????}
71????public?void?Add<T>()
72????{
73????????_lists.Add(typeof(T));
74????}
75
76????public?void?Add(Type?type)
77????{
78????????_lists.Add(type);
79????}
80
81????public?Type?GetDependencyType(Type?type)
82????{
83????????return?_lists.FirstOrDefault(x?=>?x.Name?==?type.Name);
84????}
85}