C# 表达式目录树的应用详解

使用表达式目录树实现两个不同类型的属性赋值：

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));
}
}

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