C#表达式目录树的应用详解-创新互联

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 _Dic = new Dictionary();
private static TOut TransExp(TIn tIn) {
string key = $"funckey_{typeof(TIn).FullName}_{typeof(TOut).FullName}";
if (!_Dic.Keys.Contains(key)) { 
ParameterExpression parameterExpression = Expression.Parameter(typeof(TIn), "p");
List memberBindingList = new List();
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> expression = Expression.Lambda>(Expression.MemberInit(Expression.New(typeof(TOut)), memberBindingList), new ParameterExpression[]
{
parameterExpression
});
Func func = expression.Compile();
_Dic.Add(key,func);
}
return ((Func < TIn, TOut > )_Dic[key])(tIn);
}
}
static void Main(string[] args)
{
List PeoleCopyList = new List();
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(people));
}
}

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