c# - 需要有关 C# LINQ 列表聚合表达式的建议

Question

假设我有这个类型价格列表:

[
    {
        "Id": 57571,
        "Price": 1745.0,
        "DateAdded": "2018-12-01T00:00:00"
    },
    {
        "Id": 67537,
        "Price": 1695.0,
        "DateAdded": "2018-09-24T00:00:00"
    },
    {
        "Id": 80042,
        "Price": 1645.0,
        "DateAdded": "2019-03-24T00:00:00"
    },
    {
        "Id": 155866,
        "Price": 1545.0,
        "DateAdded": "2019-04-24T00:00:00"
    },
    {
        "Id": 163643,
        "Price": 1545.0,
        "DateAdded": "2019-04-26T00:00:00"
    },
    {
        "Id": 171379,
        "Price": 1545.0,
        "DateAdded": "2019-04-27T00:00:00"
    },
    {
        "Id": 178990,
        "Price": 1545.0,
        "DateAdded": "2019-04-28T00:00:00"
    }
]

我需要删除具有相同价格的所有项目，但前提是该项目是列表元素的同级元素。是否可以使用 LINQ 来实现这一点？

我的预期输出是

[
    {
        "Id": 57571,
        "Price": 1745.0,
        "DateAdded": "2018-12-01T00:00:00"
    },
    {
        "Id": 67537,
        "Price": 1695.0,
        "DateAdded": "2018-09-24T00:00:00"
    },
    {
        "Id": 80042,
        "Price": 1645.0,
        "DateAdded": "2019-03-24T00:00:00"
    },
    {
        "Id": 155866,
        "Price": 1545.0,
        "DateAdded": "2019-04-24T00:00:00"
    }
]

我完全不知道如何实现这一目标。我很感激任何建议。

Answer 1

通过使用ChunkBy extension在微软的C#文档中找到的方法，你可以

myData.ChunkBy(x => x.Price).Select(g => g.First())

...或使用 MoreLinq's GroupAdjacent你可以

myData.GroupAdjacent(x => x.Price).Select(g => g.First())