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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