(VB.NET UWP/WinRT) Get the Root of a JSON Document

Demonstrates how to get back to the JSON root object from anywhere in the JSON document. This example uses the following JSON document:

{
  "flower": "tulip",
  "abc":
    {
    "x": [
       { "a" : 1 },
       { "b1" : 100, "b2" : 200 },
       { "c" : 3 }
    ],
    "y": 200,
    "z": 200
    }
}

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

Dim json As New Chilkat.JsonObject

Dim jsonStr As String = "{""flower"": ""tulip"",""abc"":{""x"": [{ ""a"" : 1 },{ ""b1"" : 100, ""b2"" : 200 },{ ""c"" : 3 }],""y"": 200,""z"": 200}}"

Dim success As Boolean = json.Load(jsonStr)
If (success <> True) Then
    Debug.WriteLine(json.LastErrorText)
    Exit Sub
End If


' Get the "abc" object.
Dim abcObj As Chilkat.JsonObject = json.ObjectOf("abc")
If (json.LastMethodSuccess = False) Then
    Debug.WriteLine("abc object not found.")
    Exit Sub
End If


' Side note: The JSON of a sub-part of the document can be emitted from any JSON object:
abcObj.EmitCompact = False
Debug.WriteLine(abcObj.Emit())

' Navigate to the "x" array
Dim xArray As Chilkat.JsonArray = abcObj.ArrayOf("x")
' We'll skip the null check and assume it's non-null...

' Navigate to the 2nd object contained within the array.  This contains members b1 and b2
Dim bObj As Chilkat.JsonObject = xArray.ObjectAt(1)
' We'll skip the null check and assume it's non-null...

' Show that we're at "b1/b2".
' The value of "b1" should be "200"
Debug.WriteLine("b2 = " & bObj.IntOf("b2"))

' Now go back to the JSON doc root:
Dim docRoot As Chilkat.JsonObject = bObj.GetDocRoot()
' We'll skip the null check and assume it's non-null...

' Pretty-print the JSON doc from the root to show that this is indeed the root.
docRoot.EmitCompact = False
Debug.WriteLine(docRoot.Emit())