学步园

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

/// <summary>
/// 可以根据字段过滤重复的数据
/// </summary>
/// <typeparam name="T"></typeparam>
public class Comparint<T> : IEqualityComparer<T> where T : class, new()
{
    private string[] comparintFiledName = { };

    public Comparint() { }
    public Comparint(params string[] comparintFiledName)
    {
        this.comparintFiledName = comparintFiledName;
    }

    bool IEqualityComparer<T>.Equals(T x, T y)
    {
        if (x == null && y == null)
        {
            return false;
        }
        if (comparintFiledName.Length == 0)
        {
            return x.Equals(y);
        }
        bool result = true;
        var typeX = x.GetType();//获取类型
        var typeY = y.GetType();
        foreach (var filedName in comparintFiledName)
        {
            var xPropertyInfo = (from p in typeX.GetProperties() where p.Name.Equals(filedName) select p).FirstOrDefault();
            var yPropertyInfo = (from p in typeY.GetProperties() where p.Name.Equals(filedName) select p).FirstOrDefault();

            result = result
                && xPropertyInfo != null && yPropertyInfo != null
                && xPropertyInfo.GetValue(x, null).ToString().Equals(yPropertyInfo.GetValue(y, null));
        }
        return result;
    }
    int IEqualityComparer<T>.GetHashCode(T obj)
    {
        return obj.ToString().GetHashCode();
    }
}

然后可以调用上面的类

例如：IList<BaseTag> listnew = list.Distinct(new Comparint<BaseTag>("BaseName")).ToList();

           过滤list中 字段BaseName 相同的