使用C＃將Treeview轉換為JSON

Question

我必須使用C＃將TreeView對象轉換為JSON。 我目前正在使用JsonConvert.SerializeObject() 。

public class SubTreeNode : TreeNode
{
    public CustomProperties customProperties;
}

public class CustomProperties
{

    public string property1 = "Property1";
    public string property2 = "Property2";
    public string property3 = "Property3";
}

當嘗試使用JsonConvert.SerializeObject(treeView1.Nodes); 它僅返回頂部節點，而不返回子節點，子子節點等。

序列化和反序列化此TreeView對象的最簡單方法是什么？

Answer 1

您將需要添加從每個節點遞歸生成JSON的方法。

查看相關文章： 將樹序列化為Json Object 。

Answer 2

我遇到了同樣的問題：只有頂部節點才使用標准JSON.Net序列化程序導出，這是因為，正如上述鏈接正確地聲明，“您的TreeNode類被序列化為數組，因為它實現了IEnumerable”。 進一步說，您應該使用JsonConverterAttribute裝飾TreeNode類。 我沒有得到這個工作。

這是另一種選擇。 請注意，這可能不被視為最佳方法。 但這很簡單：

• 您正在使用標准TreeNode類，並且您的數據存儲在TreeView中
• 您要使用JSON.NET序列化器

使用要在JSON中導出的信息創建一個新的層次結構類（在我的情況下，我只想導出我的treenode-properties的一部分，因此創建一個新的簡單類有意義兩次）：

'Simplified version of tree for json
'Compared to TreeNode class, this object is also serializable with the standard JSON.NET Serializer
Public Class JTree
    Public children As New List(Of JTree)()
    Private _name As String
    Public Property name() As String
        Get
            Return _name
        End Get
        Set(value As String)
            _name = value
        End Set
    End Property
    Private _id As String
    Public Property id() As String
        Get
            Return _id
        End Get
        Set(value As String)
            _id = value
        End Set
    End Property
End Class

將數據從TreeView遞歸移動到新的JTree（我們的自定義類）：

Public Sub createSimplifiedJSONTree(parentNode As TreeNode, ByRef JTreeSimp As JTree)
    'Start recursion on all subnodes
    For Each childNode As TreeNode In parentNode.Nodes
        Dim jchild As New JTree
        jchild.id = childNode.Name
        jchild.name = childNode.Text
        JTreeSimp.children.Add(jchild)
        createSimplifiedJSONTree(childNode, jchild)
    Next
End Sub

使用JSON.NET Serializer將簡化的JSON樹寫入文件：

Private Sub WriteJSONfromTreeview()
    Dim rootNode As TreeNode = TreeView1.Nodes(0)
    Dim JTreeSimp As New JTree
    createSimplifiedJSONTree(rootNode, JTreeSimp)

    'serialize JSON directly to a file using JSON.Net Serializer
    Using file__1 As StreamWriter = File.CreateText("c:\temp\test.txt")
        Dim serializer As New JsonSerializer()
        serializer.Formatting = Formatting.Indented
        serializer.Serialize(file__1, JTreeSimp)
    End Using
End Sub

最終文本（示例）：

{
  "children": [    
    {
      "children": [
        {
          "children": [
            {
              "children": [
                {
                  "children": [
                    {
                      "children": [
                        {
                          "children": [
                            {
                              "children": [],
                              "name": "alcatraz",
                              "id": "021_3",
                              "size": 166
                            }
                          ],
                          "name": "skyline",
                          "id": "031_3",
                          "size": 167
                        }
                      ],
                      "name": "city",
                      "id": "041_5",
                      "size": 167
                    }
                  ],
                  "name": "coit",
                  "id": "051_4",
                  "size": 169
                }
              ],
              "name": "tower",
              "id": "061_3",
              "size": 170
            }
          ],
          "name": "telegraphhill",
          "id": "071_3",
          "size": 170
        }
      ],
      "name": "coittower",
      "id": "081_2",
      "size": 170
    },   
    {
      "children": [
        {
          "children": [],
          "name": "sunset",
          "id": "071_112",
          "size": 3
        }
      ],
      "name": "berkeley",
      "id": "081_109",
      "size": 3
    },
    {
      "children": [
        {
          "children": [],
          "name": "marin",
          "id": "071_77",
          "size": 3
        }
      ],
      "name": "marinheadlands",
      "id": "081_110",
      "size": 3
    }
  ],
  "name": "root",
  "id": "000",
  "size": 0
}

Answer 3

這是我的解決方案：

---

1. 首先，我創建一個節點類，其中包含我想要的節點數據結構，以及一個將對象序列化的JSon方法

    [JsonObject(ItemNullValueHandling = NullValueHandling.Ignore)] private class node { public node() { this.children = new List<node>(); } public node(string _value, List<node> _children = null, bool _isChecked = false) { Value = _value; isChecked = _isChecked; if (_children != null) { children = _children; } } [JsonProperty("value")] public string Value { get; set; } [JsonProperty("isChecked")] public bool isChecked { get; set; } [JsonProperty("children", NullValueHandling = NullValueHandling.Ignore)] public List<node> children { get; set; } [JsonIgnore] public string JSon { get { return JsonConvert.SerializeObject(this); } } } 

---

2. 我編寫了一種方法，該方法旨在遞歸調用。 返回給定特定樹節點的子節點列表

     private List<node> RunNode(TreeNode node) { List<node> nodeOut = new List<node>(); foreach(TreeNode child in node.Nodes) { List<node> grandchild = RunNode(child); nodeOut.Add(new node(child.Text, grandchild, child.Checked)); } return nodeOut; } 

---

3. 我編寫並更新了對象方法，以創建一個根節點，其中可以包含樹視圖的所有節點。 我決定使用根節點而不是節點列表，因為列表中沒有用於序列化對象的JSon方法。

    private void ActualizarMenus() { List<node> parents= new List<node>(); foreach (TreeNode node in trw.Nodes) { List<node> childs = RunNode(node); parents.Add(new node(node.Text,childs,node.Checked)); } root = new node("root", parents, true); } 

4. 根對象必須聲明為單個節點

    private node root; 

   你可以調用root的JSon方法

    MessageBox.show(root.JSon()); 

我希望這有幫助

Answer 4

使用自定義json序列化器對我有用

var settings = new JsonSerializerSettings
                {
                    Converters = new List<JsonConverter> { new OrgChartConverter() },
                    Formatting = Formatting.Indented
                };

                string json = JsonConvert.SerializeObject(tree, settings);

public class OrgChartConverter : JsonConverter
{
    public override bool CanConvert(Type objectType)
    {
        return typeof(Node<T>).IsAssignableFrom(objectType);
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        Node<T> node = (Node<T>)value;
        JObject obj = new JObject();
        obj.Add("Name", node.Value.Name);
        obj.Add("Children", JArray.FromObject(node.Children, serializer));
        obj.WriteTo(writer);
    }

    public override bool CanRead
    {
        get { return false; }
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        throw new NotImplementedException();
    }
}