VB.NET

Find and Delete Object from JSON Array

See more JSON Examples

Demonstrates how to find an delete an object from a JSON array of objects. VB.NET

Dim success As Boolean = False

' This example will delete the "Pasta" category object from Menu B.

' {
'   "menus": [
'     {
'       "name": "Menu A",
'       "categories": [
' 			{
' 			"name": "Kebabs",
' 			"description": "blah blah blah"
' 			},
' 			{
' 			"name": "Burgers",
' 			"description": "blah blah blah"
' 			},
' 			{
' 			"name": "Pasta",
' 			"description": "blah blah blah"
' 			},
' 			{
' 			"name": "Appetizers",
' 			"description": "blah blah blah"
' 			}
' 		]
' 	},
'     {
'       "name": "Menu B",
'       "categories": [
' 			{
' 			"name": "Kebabs",
' 			"description": "blah blah blah"
' 			},
' 			{
' 			"name": "Burgers",
' 			"description": "blah blah blah"
' 			},
' 			{
' 			"name": "Pasta",
' 			"description": "blah blah blah"
' 			},
' 			{
' 			"name": "Appetizers",
' 			"description": "blah blah blah"
' 			}
' 		]
' 	  }
' 	]
' }

Dim json As New Chilkat.JsonObject
success = json.LoadFile("qa_data/json/menus.json")
If (success = False) Then
    Debug.WriteLine(json.LastErrorText)
    Exit Sub
End If


' Find Menu B.
Dim menu As Chilkat.JsonObject = json.FindRecord("menus","name","Menu B",True)
' assume menu is found..

' Get the categories array, and then find the index of the "Pasta" menu category.
Dim catArr As Chilkat.JsonArray = menu.ArrayOf("categories")
' Assume it is found..

' Find the object where the name of the JSON member is "name", and the value is "Pasta"
Dim index As Integer = catArr.FindObject("name","Pasta",True)
If (index < 0) Then
    Debug.WriteLine("Pasta not found.")
Else

    ' Delete the "Pasta" category record from Menu B
    success = catArr.DeleteAt(index)
    ' Assume OK..
End If


' Examine the JSON to see if it worked as expected..
json.EmitCompact = False
Debug.WriteLine(json.Emit())