选择出现在两个列表中的单个元素
本文关键字:列表 两个 元素 单个 选择 | 更新日期: 2023-09-27 18:23:41
我需要从属性列表中按名称找到一个属性,该属性与另一个列表中的字符串相匹配,该列表是根据声明类型的类型生成的。
╔═════════════╦═════════════════╗
║ Properties ║ Names ║
╠═════════════╬═════════════════╣
║ User.UserId ║ Id ║
║ User.Name ║ IdUser ║
║ User.Age ║ UserId <- MATCH ║
║ User.Email ║ Key ║
║ ║ UserKey ║
║ ║ KeyUser ║
╚═════════════╩═════════════════╝
private const string IdAffix = "Id";
private const string KeyAffix = "Key";
private static readonly Func<Type, IEnumerable<string>> GetIdentityNamePatterns
= type => new [] { IdAffix, KeyAffix, type.Name + IdAffix, IdAffix + Type.Name,...}
private Expression<Func<TEntity, TIdentity> KeySelector = entity =>
{
var type = typeof(TEntity);
if(type.IsAssignableFrom(typeof(IEntity<TIdentity>)))
return ((IEntity<TIdentity>) entity).Id;
const BindingFlags bindingFlags
= BindingFlags.IgnoreCase | BindingFlags.GetProperty | BindingFlags.Public;
var properties = type.GetProperties(bindingFlags);
var identityProperty = entityProperties.SingleOrDefault(x =>
Attribute.IsDefined(x, typeof(IdentityAttribute)) && x.PropertyType == typeof (TIdentity))
// this is where I'm stuck
// how to loopthe list of possible names while looping
// through the properties at the same time?
?? entityProperties.SingleOrDefault(
x => x.Name.Equals... // GetIdentityNamePatterns(type)
我不能100%确定你的意思-基本上,你想返回某个对象的属性-该属性的名称存在于其他列表中吗?
var namesToMatch = GetIdentityNamePatterns(type);
var property = entityProperties
.FirstOrDefault(p => namesToMatch.Any(n => x => x.Name.Equals(n)));