Изменения документа Сценарии

Сводка

• Свойства страницы (1 изменено, 0 добавлено, 0 удалено)

Подробности

Свойства страницы

Содержимое

...	...	@@ -13,8 +13,14 @@
13	13	|(% style="width:394px" %) |(% style="width:1090px" %)(((
14	14	How do I set a field value in an C# Expression tree?
15	15	[[https:~~/~~/stackoverflow.com/questions/321650/how-do-i-set-a-field-value-in-an-c-sharp-expression-tree>>https://stackoverflow.com/questions/321650/how-do-i-set-a-field-value-in-an-c-sharp-expression-tree]]
	16	+
	17	+How do you call a constructor via an expression tree on an existing object?
	18	+[[https:~~/~~/stackoverflow.com/questions/16363838/how-do-you-call-a-constructor-via-an-expression-tree-on-an-existing-object>>https://stackoverflow.com/questions/16363838/how-do-you-call-a-constructor-via-an-expression-tree-on-an-existing-object]]
	19	+
	20	+How do I set a field value in an C# Expression tree?
	21	+[[https:~~/~~/stackoverflow.com/questions/321650/how-do-i-set-a-field-value-in-an-c-sharp-expression-tree>>https://stackoverflow.com/questions/321650/how-do-i-set-a-field-value-in-an-c-sharp-expression-tree]]
16	16	)))
17		-|(% style="width:394px" %)Типизированый вызов конструктора|(% style="width:1090px" %){{code language="c#"}}var constructorInfo = type.GetConstructors().First(e => e.Attributes.HasFlag(MethodAttributes.Public));
	23	+|(% style="width:394px" %)Вызов конструктора|(% style="width:1090px" %){{code language="c#"}}var constructorInfo = type.GetConstructors().First(e => e.Attributes.HasFlag(MethodAttributes.Public));
18	18	var constructorParameter1 = Expression.Parameter(typeof(bool));
19	19	var constructorExp = Expression.New(constructorInfo, constructorParameter1);
20	20
...	...	@@ -28,113 +28,20 @@
28	28	How do you call a constructor via an expression tree on an existing object?
29	29	[[https:~~/~~/stackoverflow.com/questions/16363838/how-do-you-call-a-constructor-via-an-expression-tree-on-an-existing-object>>https://stackoverflow.com/questions/16363838/how-do-you-call-a-constructor-via-an-expression-tree-on-an-existing-object]]
30	30	)))
31		-|(% style="width:394px" %)Нетипизированый вызов|(% style="width:1090px" %)(((
32		-|{{code language="c#"}}public delegate object ConstructorDelegate(object[]? Args);
33	33
34		-public static ConstructorDelegate GetConstructorWithArgsDelegate(
35		- ConstructorInfo constructorInfo)
36		-{
37		- ParameterExpression constructorParameters = Expression.Parameter(typeof(object?[]));
38		-
39		- Expression[] parameterExpressions;
40		- {
41		- ParameterInfo[] parametersInfos = constructorInfo.GetParameters();
42		- parameterExpressions = new Expression[parametersInfos.Length];
43		-
44		- for (int i = 0; i < parametersInfos.Length; i++)
45		- {
46		- ConstantExpression ithIndex = Expression.Constant(i);
47		- BinaryExpression ithParameter = Expression.ArrayIndex(
48		- constructorParameters,
49		- ithIndex);
50		- UnaryExpression unboxedIthParameter = Expression.Convert(
51		- ithParameter,
52		- parametersInfos[i].ParameterType
53		- );
54		- parameterExpressions[i] = unboxedIthParameter;
55		- }
56		- }
57		-
58		- NewExpression constructorCallExp = Expression.New(
59		- constructorInfo,
60		- parameterExpressions);
61		-
62		- var convertResultExp = Expression.Convert(
63		- constructorCallExp,
64		- typeof(object)
65		- );
66		-
67		- var constructorHandler = Expression
68		- .Lambda<ConstructorDelegate>(
69		- convertResultExp,
70		- constructorParameters
71		- )
72		- .Compile();
73		-
74		- return constructorHandler;
75		-}{{/code}}|{{code language="c#"}}object Func<object[]>{{/code}}(((
76		-C# Expression tree: object array to Expression.New() parameters
77		-[[https:~~/~~/stackoverflow.com/questions/67968927/c-sharp-expression-tree-object-array-to-expression-new-parameters>>https://stackoverflow.com/questions/67968927/c-sharp-expression-tree-object-array-to-expression-new-parameters]]
78		-)))
79		-|{{code language="c#"}}public delegate object? MethodDelegate(object instance, object[]? Args);
	38	+==== ====
80	80
81		-public static MethodDelegate GetMethodWithArgsDelegate(
82		- MethodInfo methodInfo,
83		- Type instanceType)
84		-{
85		- ParameterExpression instanceParameter = Expression.Parameter(typeof(object));
86		- ParameterExpression methodParameters = Expression.Parameter(typeof(object?[]));
87		-
88		- Expression instanceExp;
89		- Expression[] parameterExpressions;
90		- {
91		- instanceExp = Expression.Convert(instanceParameter, instanceType);
92		-
93		- ParameterInfo[] parametersInfos = methodInfo.GetParameters();
94		- parameterExpressions = new Expression[parametersInfos.Length];
95		-
96		- for (int i = 0; i < parametersInfos.Length; i++)
97		- {
98		- ConstantExpression ithIndex = Expression.Constant(i);
99		- BinaryExpression ithParameter = Expression.ArrayIndex(
100		- methodParameters,
101		- ithIndex);
102		- UnaryExpression unboxedIthParameter = Expression.Convert(
103		- ithParameter,
104		- parametersInfos[i].ParameterType
105		- );
106		- parameterExpressions[i] = unboxedIthParameter;
107		- }
108		- }
109		-
110		- var callExpression = Expression.Call(
111		- instanceExp,
112		- methodInfo,
113		- parameterExpressions
114		- );
115		-
116		- var convertResultExp = Expression.Convert(
117		- callExpression,
118		- typeof(object)
119		- );
120		-
121		- var callHandler = Expression
122		- .Lambda<MethodDelegate>(
123		- convertResultExp,
124		- instanceParameter,
125		- methodParameters
126		- )
127		- .Compile();
128		-
129		- return callHandler;
130		-}{{/code}}|{{code language="c#"}}object? Func<object, object[]>{{/code}}
131		-
132		-
133		-)))
134		-|(% style="width:394px" %)[[Generic enum to int>>doc:.Generic enum to int.WebHome]]|(% style="width:1090px" %)
135		-
136	136	==== ====
137	137
138	138	==== ====
139	139
	44	+
	45	+----
	46	+
140	140	==== ====
	48	+
	49	+
	50	+----
	51	+
	52	+
	53	+----