Linq To Object多字段组合唯一校验

1.第一种方式
if(partsSalesOrderTypes.GroupBy(entity => new {
                    entity.Name,
                    entity.Code
                }).Any(array => array.Count() > 1)) {
                    /*违反多字段唯一时，提示信息处理*/
 return;
}
2.第二种方式
var groupPrice = from price in this.PartsSpecialTreatyPrices
                               group price by new {
                                       price.DealerId,     //分组字段
                                       price.PartsSalesCategoryId,    //分组字段
                                       price.SparePartId    //分组字段
                               }
                                       into groups
                                       select new {
                                               count = groups.Count(),
                                               key = groups.Key

                                       };
if(groupPrice.Any(group => group.count > 1)) {
     /*违反多字段唯一时，提示信息处理*/
}