class MyObj
{
    public String Title { get; set; }
    public Decimal Price { get; set; }
    public String OtherData { get; set; }
}

var list = new List<MyObj> {
 new MyObj { Title = "AAA",Price = 20,OtherData = "Z1" },new MyObj { Title = "BBB",OtherData = "Z2" },new MyObj { Title = "AAA",Price = 30,OtherData = "Z5" },Price = 10,OtherData = "Z10" },new MyObj { Title = "CCC",Price = 99,OtherData = "ZZ" }
};

var ret = new List<MyObj> {
 new MyObj { Title = "BBB",OtherData = "ZZ" }
};

@R_404_323@@H_404_11@

好吧,你可以这样做：

var query = list.GroupBy(x => x.Title)
                .Select(group =>
                {
                    decimal maxPrice = group.Max(x => x.Price);
                    return group.Where(x => x.Price == maxPrice)
                                .First();
                };

如果你需要LINQ to sql(你不能使用语句lambdas),你可以使用：

var query = list.GroupBy(x => x.Title)
       .Select(group => group.Where(x => x.Price == group.Max(y => y.Price))
                             .First());

请注意,在LINQ to Objects中,效率会低于Where的每次迭代,它会重新计算最高价格.

如果您希望能够返回具有给定名称的多个项目(如果它们具有相同的价格),请调整.First()部分.

在LINQ to Objects中,您还可以使用MoreLINQ的MaxBy方法：

var query = list.GroupBy(x => x.Title)
                .Select(group => group.MaxBy(x => x.Price));