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使用表達(dá)式目錄樹實(shí)現(xiàn)兩個不同類型的屬性賦值:
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)); } }
以上這篇C# 表達(dá)式目錄樹的應(yīng)用詳解就是小編分享給大家的全部內(nèi)容了,希望能給大家一個參考,也希望大家多多支持億速云。
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