Question

我还没有很好地掌握LINQ，感觉我的代码可以优化，以寻求帮助。贝娄是我的模特

class entity
{
    public string id  { get; set; }
    public string catagory { get; set; }
    public IList<details> info{ get; set;}
}
class details
{ 
    public string id{ get; set; }
    public string name { get; set; }
    public string locale { get; set; }
}   

List<entity> list = new List<entity>();
list.Add(new entity { id = "1", catagory = "cat1", info = new { locale = "en", name = "d1" }, {  locale = "fr", name = "d2" } });
list.Add(new entity { id = "2", catagory = "cat2", info = new { locale = "en", name = "d3" }});

需要根据区域设置过滤掉，假设我只需要获得locale =＆＃34; en＆＃34;列表..

为了清晰起见，在json中建模

     { 
      "id": "1",
      "catagory": "cat1",
      "info": [{"locale":"en","name":"d1"},{"locale":"fr","name":"d1"}]
    },
    { 
      "id": "2",
      "catagory": "cat2",
      "info": [{"locale":"en","name":"d3"}]
    }

预期结果 - 仅获取区域设置=＆＃34; en＆＃34;

     { 
      "id": "1",
      "catagory": "cat1",
      "info": [{"locale":"en","name":"d1"}]
    },
    { 
      "id": "2",
      "catagory": "cat2",
      "info": [{"locale":"en","name":"d3"}]
    }`

Answer 1

仅限linq的解决方案将是：

var result = list.Select(item => new entity
        {
            id = item.id,
            catagory = item.catagory,
            info = item.info.Where(inner => inner.locale == "en").ToList()
        });

如果您不想投射新的entry个详细信息，请使用foreach循环，并在其中为每个项目保留仅匹配的details：

foreach (var item in list)
{
    item.info = item.info.Where(inner => inner.locale == "en").ToList();
}

请注意，您的课程不遵循C＃的命名惯例：

General Naming Conventions - MSDN

Answer 2

试试这个...希望它可以帮助你（修复你的一些代码）：

 class entity
        {
            public string id { get; set; }
            public string catagory { get; set; }
            public IList<details> info { get; set; }
        }
        class details
        {
            public string id { get; set; }
            public string name { get; set; }
            public string locale { get; set; }
        }

 List<entity> list = new List<entity>();
            list.Add(new entity { id = "1", catagory = "cat1", info = new List<details> { new details { locale = "en", name = "d1" }, new details { locale = "fr", name = "d2" } } });
            list.Add(new entity { id = "2", catagory = "cat2", info = new List<details> { new details { locale = "en", name = "d3" } } });

            var result = list.Where(xx => xx.info.Any(yy => yy.locale == ""));

Linq查询过滤掉列表列表而不使用Remove

2 个答案: