使用表达式目录树实现两个不同类型的属性赋值：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
public class People{public int Age { get; set; }public string Name { get; set; }public int Id;}public class PeopleCopy{public int Age { get; set; }public string Name { get; set; }public int Id;}public class Class1{private static Dictionary<string, object> _Dic = new Dictionary<string, object>();private static TOut TransExp<TIn, TOut>(TIn tIn) {string key = $"funckey_{typeof(TIn).FullName}_{typeof(TOut).FullName}";if (!_Dic.Keys.Contains(key)) { ParameterExpression parameterExpression = Expression.Parameter(typeof(TIn), "p");List<MemberBinding> memberBindingList = new List<MemberBinding>();foreach (var item in typeof(TOut).GetProperties()){PropertyInfo propertyInfo = typeof(TIn).GetProperty(item.Name);if (propertyInfo == null) { continue; }MemberExpression property = Expression.Property(parameterExpression, propertyInfo);memberBindingList.Add(Expression.Bind(item, property));}foreach (var item in typeof(TOut).GetFields()){FieldInfo fieldInfo = typeof(TIn).GetField(item.Name);if (fieldInfo == null) { continue; }MemberExpression property = Expression.Field(parameterExpression, fieldInfo);memberBindingList.Add(Expression.Bind(item, property));}Expression<Func<TIn, TOut>> expression = Expression.Lambda<Func<TIn, TOut>>(Expression.MemberInit(Expression.New(typeof(TOut)), memberBindingList), new ParameterExpression[]{parameterExpression});Func<TIn, TOut> func = expression.Compile();_Dic.Add(key,func);}return ((Func < TIn, TOut > )_Dic[key])(tIn);}}static void Main(string[] args){List<ClassLibrary1.PeopleCopy> PeoleCopyList = new List<ClassLibrary1.PeopleCopy>();for (int i = 0; i < 5; i++){ClassLibrary1.People people = new ClassLibrary1.People() { Id = 5+1, Age = 25, Name = "aaa"+i };PeoleCopyList.Add(Class1.ToutGet<ClassLibrary1.People, ClassLibrary1.PeopleCopy>(people));}} |
以上这篇C# 表达式目录树的应用详解就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持服务器之家。
原文链接：http://www.cnblogs.com/Torey/archive/2017/12/16/8048131.html
