Question

必须从API调用反序列化JSON。在下面发布JSON流。必须获得每个“区域”节点。请注意，有些孩子有孩子（这是我遇到了麻烦）。昨天之前甚至不知道JSON是什么（说我已经出去了一段时间）。

我发现了什么：添加了Netwonsoft.Json参考将其转换为XML以查看是否有所帮助，但认为保持JSON会有更好的性能。

vb.net类具有以下属性： Area_Name为字符串（JSON中的“ID”） Area_ID为字符串（JSON中的“Name”） Parent_ID为字符串（JSON中的父“ID”）

因此，需要知道从哪里开始从以下JSON中提取所有节点。 ----- JSON Stream -----

{"areas":
    [{"id":"1353331688024941487","name":"NGT","children":
        [{"id":"1353331688024941488","name":"Other","children":
            [
             {"id":"1353331688024941489","name":"Independence Office","children":[]},
             {"id":"1353331688024941490","name":"Lordstown Pipe Receipt Site (PRS)","children":[]},
             {"id":"1353331688024941491","name":"Marion Pipe Receipt Site (PRS)","children":[]},
             {"id":"1353331688024941492","name":"Marion Warehouse Facility","children":[]},
             {"id":"1353331688024941493","name":"Port of Toledo Pipe Receipt Site (PRS)","children":[]},
             {"id":"1353331688024941494","name":"Spread -1 - No facility","children":[]},
             {"id":"1353331688024941495","name":"Spread -2 - Wadsworth Office","children":[]},
             {"id":"1353331688024941496","name":"Spread -3 - Toledo Office","children":[]},
             {"id":"1353331688024941497","name":"Spread -4 - Dundee Office","children":[]}
            ]
         },
         {"id":"1353331688024941498","name":"Spread-1","children":
            [
            {"id":"1353331688024941499","name":"Compressor Station 1","children":[]},
            {"id":"1353331688024941500","name":"Field Inspectors 1","children":[]},
            {"id":"1353331688024941501","name":"Meter Station 1","children":[]},
            {"id":"1353331688024941502","name":"Meter Station 2","children":[]},
            {"id":"1353331688024941503","name":"Meter Station 3","children":[]},
            {"id":"1353331688024941504","name":"NDE Testing 1","children":[]},
            {"id":"1353331688024941505","name":"Pipeline 1","children":[]},
            {"id":"1353331688024941506","name":"Wareyard 1-1","children":[]}
            ]
         },
        {"id":"1353331688024941507","name":"Spread-2","children":
            [
             {"id":"1353331688024941508","name":"Compressor Station 2","children":[]},
             {"id":"1353331688024941509","name":"Field Inspectors 2","children":[]},
             {"id":"1353331688024941510","name":"Meter Station 5","children":[]},
             {"id":"1353331688024941511","name":"NDE Testing 2","children":[]},
             {"id":"1353331688024941512","name":"Pipeline 2","children":[]},
             {"id":"1353331688024941513","name":"Wareyard 2-1","children":[]}
            ]
        },
        {"id":"1353331688024941514","name":"Spread-3","children":
            [
             {"id":"1353331688024941515","name":"Compressor Station 3","children":[]},
             {"id":"1353331688024941516","name":"Compressor Station 4","children":[]},
             {"id":"1353331688024941517","name":"Field Inspectors 3","children":[]},
             {"id":"1353331688024941518","name":"Meter Station 6","children":[]},
             {"id":"1353331688024941519","name":"NDE Testing 3","children":[]},
             {"id":"1353331688024941520","name":"Pipeline 2","children":[]},
             {"id":"1353331688024941521","name":"Wareyard 3-1","children":[]}
            ]
        },
        {"id":"1353331688024941522","name":"Spread-4","children":
            [
             {"id":"1353331688024941523","name":"Field Inspectors 4","children":[]},
             {"id":"1353331688024941524","name":"Meter Station 4","children":[]},
             {"id":"1353331688024941525","name":"NDE Testing 4","children":[]},
             {"id":"1353331688024941526","name":"Pipeline 4","children":[]},
             {"id":"1353331688024941527","name":"Wareyard 4-1","children":[]},
             {"id":"1353331688024941528","name":"Wareyard 4-3","children":[]},
             {"id":"1353331688024941529","name":"Wareyard 4-4","children":[]}

            ]
        }
    ]
    }
    ]
}

谢谢，感谢您的帮助。

Answer 1

Visual Studio将创建您需要的类，或者您可以使用在线机器人。在VS中，使用剪贴板上的JSON，编辑 - ＆gt; 选择性粘贴 - ＆gt; 将JSON粘贴为类

两者都有点密集，因为他们不会认识到Child类实际上是相同的，你可以使用相同的类。 事实上， Area和Child类也是相同的：

Public Class AreaContainer
    Public Property areas As AreaItem()
End Class

Public Class AreaItem
    Public Property id As String
    Public Property name As String
    Public Property children As AreaItem()    ' no need for a Child1
End Class

反序列化：

Dim jstr = ...wherever you get it
Dim myareas = JsonConvert.DeserializeObject(Of AreaContainer)(jstr)

我不确定您的目标是什么，但这会打印NGT.Other名儿童的姓名和他们的儿童的名字。

For n As Int32 = 0 To myareas.areas(0).children(0).children.Count - 1
    Console.WriteLine("Name {0}    => children: {1}",
                        myareas.areas(0).children(0).children(n).name,
                        myareas.areas(0).children(0).children(n).children.Count)
Next

名称独立办事处=＆gt;孩子：0
  名称Lordstown Pipe Receipt Site（PRS）=＆gt;孩子：0
  名称Marion Pipe Receipt Site（PRS）=＆gt;孩子：0
  名称Marion Warehouse Facility =＆gt;孩子：0
  名称托莱多管道接收站点（PRS）=>孩子：0
  名称传播-1 - 没有设施=＆gt;孩子：0
  名称差价-2 - Wadsworth Office =＆gt;孩子：0
  名称差价-3 - 托莱多办公室=＆gt;孩子：0
  名称传播-4 - 邓迪办公室=＆gt;孩子：0

Intellisense将帮助您在完成课程后导航结构
本地窗口也将扩展收藏和帮助＆＃34;参见＆＃34;如何获得不同的数据元素

如此处的其他帖子所示，您可以通过首先解析JSON来简化代码必须使用的结果对象，将areas部分反序列化为数组。它省略了myAreas变量以及AreaContainer类，两者都没有用处。

Answer 2

你需要再增加一个“AreaModel”类，其中包含一个属性“Areas”。所以你的课程应如下所示。

public class AreaModel
{
    public List<Area> Areas { get; set; }
}
public class Area
{
    [JsonProperty(PropertyName = "id")]
    public string Area_Name 
    {
        get;
        set;
    }

    [JsonProperty(PropertyName = "name")]
    public string Area_ID {get;set;}

    [JsonProperty(PropertyName= "children")]
    public List<Area> Children 
    { 
        get;set;
    }
}

然后您可以将JSON字符串反序列化如下。

var areaModel = JsonConvert.DeserializeObject<AreaModel>(areaJSON);

foreach (var area in areaModel.Areas)
{
    DisplayAreas(area);
}

private static void DisplayAreas(Area area)
{
    Console.WriteLine(area.Area_Name);
    if(area.Children != null && area.Children.Count > 0)
    {
        foreach(var child in area.Children)
        {
            DisplayAreas(child);
        }
    }
}

用儿童用品反序列化json

2 个答案: