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(VB.NET UWP/WinRT) Using Pre-defined JSON Templates

Demonstrates how to predefine a JSON template, and then use it to emit JSON with variable substitutions.

Note: This example requires Chilkat v9.5.0.67 or greater.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads

Chilkat for the Universal Windows Platform (UWP)

'  One way to create JSON is to do it in a straightforward manner:
Dim json As New Chilkat.JsonObject
json.EmitCompact = False
json.UpdateString("id","0001")
json.UpdateString("type","donut")
json.UpdateString("name","Cake")
json.UpdateString("image.url","images/0001.jpg")
json.UpdateInt("image.width",200)
json.UpdateInt("image.height",200)
json.UpdateString("thumbnail.url","images/thumbnails/0001.jpg")
json.UpdateInt("thumbnail.width",32)
json.UpdateInt("thumbnail.height",32)
Debug.WriteLine(json.Emit())

'  The JSON created by the above code:

'  	{
'  	  "id": "0001",
'  	  "type": "donut",
'  	  "name": "Cake",
'  	  "image": {
'  	    "url": "images/0001.jpg",
'  	    "width": 200,
'  	    "height": 200
'  	  },
'  	  "thumbnail": {
'  	    "url": "images/thumbnails/0001.jpg",
'  	    "width": 32,
'  	    "height": 32
'  	  }
'  	}


'  An alternative is to predefine a template, and then use it to emit with variable substitutions.
'  For example:

Dim jsonTemplate As New Chilkat.JsonObject
jsonTemplate.UpdateString("id","{$id}")
jsonTemplate.UpdateString("type","donut")
jsonTemplate.UpdateString("name","{$name}")
jsonTemplate.UpdateString("image.url","{$imageUrl}")
'  The "i." indicates that it's an integer variable.
jsonTemplate.UpdateString("image.width","{$i.imageWidth}")
jsonTemplate.UpdateString("image.height","{$i.imageHeight}")
jsonTemplate.UpdateString("thumbnail.url","{$thumbUrl}")
jsonTemplate.UpdateString("thumbnail.width","{$i.thumbWidth}")
jsonTemplate.UpdateString("thumbnail.height","{$i.thumbHeight}")
'  Give this template a name.
jsonTemplate.Predefine("donut")

'  --------------------------------------------------------------------------
'  OK, the template is defined.  Defining a template can be done once
'  at the start of your program, and you can discard the jsonTemplate object (it
'  doesn't need to stick around..)

'  Now we can create instances of the JSON object by name:
Dim jsonDonut As New Chilkat.JsonObject
jsonDonut.EmitCompact = False
jsonDonut.LoadPredefined("donut")
Debug.WriteLine(jsonDonut.Emit())

'  The output is this:

'  	{
'  	  "id": "{$id}",
'  	  "type": "donut",
'  	  "name": "{$name}",
'  	  "image": {
'  	    "url": "{$imageUrl}",
'  	    "width": "{$i.imageWidth}",
'  	    "height": "{$i.imageHeight}"
'  	  },
'  	  "thumbnail": {
'  	    "url": "{$thumbUrl}",
'  	    "width": "{$i.thumbWidth}",
'  	    "height": "{$i.thumbHeight}"
'  	  }
'  	}

'  Finally, we can substitute variables like this:
Dim donutValues As New Chilkat.Hashtable
donutValues.AddStr("id","0001")
donutValues.AddStr("name","Cake")
donutValues.AddStr("imageUrl","images/0001.jpg")
donutValues.AddInt("imageWidth",200)
donutValues.AddInt("imageHeight",200)
donutValues.AddStr("thumbUrl","images/thumbnails/0001.jpg")
donutValues.AddInt("thumbWidth",32)
donutValues.AddInt("thumbHeight",32)

'  Emit with variable substitutions:
Dim omitEmpty As Boolean = True
Debug.WriteLine(jsonDonut.EmitWithSubs(donutValues,omitEmpty))

'  Output:

'  	{
'  	  "id": "0001",
'  	  "type": "donut",
'  	  "name": "Cake",
'  	  "image": {
'  	    "url": "images/0001.jpg",
'  	    "width": 200,
'  	    "height": 200
'  	  },
'  	  "thumbnail": {
'  	    "url": "images/thumbnails/0001.jpg",
'  	    "width": 32,
'  	    "height": 32
'  	  }
'  	}

'  Change some of the values:
donutValues.AddStr("id","0002")
donutValues.AddStr("imageUrl","images/0002.jpg")
donutValues.AddStr("thumbUrl","images/thumbnails/0002.jpg")

Debug.WriteLine(jsonDonut.EmitWithSubs(donutValues,omitEmpty))

'  Output:

'  	{
'  	  "id": "0002",
'  	  "type": "donut",
'  	  "name": "Cake",
'  	  "image": {
'  	    "url": "images/0002.jpg",
'  	    "width": 200,
'  	    "height": 200
'  	  },
'  	  "thumbnail": {
'  	    "url": "images/thumbnails/0002.jpg",
'  	    "width": 32,
'  	    "height": 32
'  	  }
'  	}

 

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