server/aspnetapp/Helper/LinqHelper.cs

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using System;
using System.Collections.Generic;

namespace aspnetapp.Helper
{
    public static class LinqHelper
    {
        public static IEnumerable<TSource> DistinctBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector)
        {
            HashSet<TKey> seenKeys = new HashSet<TKey>();
            foreach (TSource element in source)
            {
                if (seenKeys.Add(keySelector(element)))
                {
                    yield return element;
                }
            }
        }

        /// <summary>
        /// 将父类的值赋值到子类中
        /// </summary>
        /// <typeparam name="TParent"></typeparam>
        /// <typeparam name="TChild"></typeparam>
        /// <param name="parent"></param>
        /// <param name="child"></param>
        public static void CopyToChild<TParent, TChild>(TParent parent, TChild child)
        {
            var ParentType = typeof(TParent);
            var Properties = ParentType.GetProperties();
            foreach (var Propertie in Properties)
            {
                //循环遍历属性
                if (Propertie.CanRead && Propertie.CanWrite)
                {
                    //进行属性拷贝
                    Propertie.SetValue(child, Propertie.GetValue(parent, null), null);
                }
            }
        }
    }
}