private void btn_Convert_MouseClick(object sender, MouseEventArgs e)
{
try
{
string json = rbt_display.Text;
JObject obj = JObject.Parse(json);
tvw_display.Nodes.Clear();
TreeNode parent = Json2Tree(obj);
parent.Text = "Root Object";
tvw_display.Nodes.Add(parent);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "ERROR");
}
}
private TreeNode Json2Tree(JObject obj)
{
//create the parent node
TreeNode parent = new TreeNode();
//loop through the obj. all token should be pair<key, value>
foreach (var token in obj)
{
//change the display Content of the parent
parent.Text = token.Key.ToString();
//create the child node
TreeNode child = new TreeNode();
child.Text = token.Key.ToString();
//check if the value is of type obj recall the method
if (token.Value.Type.ToString() == "Object")
{
// child.Text = token.Key.ToString();
//create a new JObject using the the Token.value
JObject o = (JObject)token.Value;
//recall the method
child = Json2Tree(o);
//add the child to the parentNode
parent.Nodes.Add(child);
}
//if type is of array
else if (token.Value.Type.ToString() == "Array")
{
int ix = -1;
// child.Text = token.Key.ToString();
//loop though the array
foreach (var itm in token.Value)
{
//check if value is an Array of objects
if (itm.Type.ToString() == "Object")
{
TreeNode objTN = new TreeNode();
//child.Text = token.Key.ToString();
//call back the method
ix++;
JObject o = (JObject)itm;
objTN = Json2Tree(o);
objTN.Text = token.Key.ToString() + "[" + ix + "]";
child.Nodes.Add(objTN);
//parent.Nodes.Add(child);
}
//regular array string, int, etc
else if(itm.Type.ToString() == "Array")
{
ix++;
TreeNode dataArray = new TreeNode();
foreach (var data in itm)
{
dataArray.Text = token.Key.ToString() + "[" + ix + "]";
dataArray.Nodes.Add(data.ToString());
}
child.Nodes.Add(dataArray);
}
else
{
child.Nodes.Add(itm.ToString());
}
}
parent.Nodes.Add(child);
}
else
{
//if token.Value is not nested
// child.Text = token.Key.ToString();
//change the value into N/A if value == null or an empty string
if (token.Value.ToString() == "")
child.Nodes.Add("N/A");
else
child.Nodes.Add(token.Value.ToString());
parent.Nodes.Add(child);
}
}
return parent;
}
sample json
{
"firstName": "John",
"lastName": "Smith",
"isAlive": true,
"age": 25,
"height_cm": 167.6,
"address": {
"streetAddress": "21 2nd Street",
"city": "New York",
"state": "NY",
"postalCode": "10021-3100"
},
"phoneNumbers": [
{
"type": "home",
"number": "212 555-1234"
},
{
"type": "office",
"number": "646 555-4567"
}
],
"children": [],
"spouse": null
}
Note: This example uses NewtonSoft Json. Right-click solution and click manage NuGet packages to install the reference.
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