C# 使用LINQ展平嵌套结构

我收到一个JSON负载，它有嵌套列表。LINQ是否可以用于展平结构并将嵌套列表提取为非规范化形式

我有很强的数据库背景，所以我称之为JSON数据的非规范化形式

我以前使用过LINQ，但没有使用这些深层结构

我尝试过使用LINQ fluent方法，但我可以；我似乎无法进入嵌套列表

        public class Exampleobject
        {
            public string result { get; set; }
            public Propertydata propertyData { get; set; }
        }

        public class Propertydata
        {
            public List<Buildings> building { get; set; }           
        }



        public class Buildings
        {
            public string itemId { get; set; }
            [JsonProperty("type")]
            public string buildingType { get; set; }
            public string buildingTypeCode { get; set; }
            public string buildingTypeDescription { get; set; }            

            [JsonProperty("floors")]
            public List<floorInvolved> floorsInvolved { get; set; }            
        }

        public class floorInvolved
        {
            public string InvolvedId { get; set; }
            public List<FRole> roles { get; set; }
        }

        public class FRole
        {
            public string code { get; set; }
            public string description { get; set; }
        }                     

我像这样加载json数据
var resulting=JsonConvert.DeserializeObject（rawjson）；

使用查询语法：

var result =
    from building in resulting.propertyData.building
    from floor in building.floorsInvolved
    select $"{building.itemId} {building.buildingTypeDescription} " +
        $"{floor.InvolvedId} " +
        $"{string.Join(", ", floor.roles.Select(role => role.description))}";

或者（也许更容易理解）：

使用扩展方法语法：

 var result = resulting.propertyData.building
    .SelectMany(building => building.floorsInvolved
        .Select(floor => $"{building.itemId} {building.buildingTypeDescription} " +
            $"{floor.InvolvedId} " +
            $"{string.Join(", ", floor.roles.Select(role => role.description))}"));

使用查询语法：

var result =
    from building in resulting.propertyData.building
    from floor in building.floorsInvolved
    select $"{building.itemId} {building.buildingTypeDescription} " +
        $"{floor.InvolvedId} " +
        $"{string.Join(", ", floor.roles.Select(role => role.description))}";

或者（也许更容易理解）：

使用扩展方法语法：

 var result = resulting.propertyData.building
    .SelectMany(building => building.floorsInvolved
        .Select(floor => $"{building.itemId} {building.buildingTypeDescription} " +
            $"{floor.InvolvedId} " +
            $"{string.Join(", ", floor.roles.Select(role => role.description))}"));

---

扩展方法语法中的

SelectMany

，或查询语法中的

from x in xs from y in x.ys…

。我已经使用了SelectMany，但我仍然无法找到在这种情况下如何正确使用LINQ的答案

SelectMany

在扩展方法语法中，或者查询语法中的

from x in xs from y in x.ys…

。我已经使用了SelectMany，但我仍然无法找到在这种情况下如何正确使用LINQ的答案Beautiful——工作起来很有魅力，我终于对如何在这些数据上使用LINQ有了一些见解。我欠你很多啤酒！漂亮——工作起来很有魅力，我终于有了一些见解，可以继续在这些数据上使用LINQ。我欠你很多啤酒！

var result =
    from building in resulting.propertyData.building
    from floor in building.floorsInvolved
    let roles = floor.roles.Select(role => role.description)
    select $"{building.itemId} {building.buildingTypeDescription} " +
        $"{floor.InvolvedId} {string.Join(", ", roles)}";

 var result = resulting.propertyData.building
    .SelectMany(building => building.floorsInvolved
        .Select(floor => $"{building.itemId} {building.buildingTypeDescription} " +
            $"{floor.InvolvedId} " +
            $"{string.Join(", ", floor.roles.Select(role => role.description))}"));