From JSON to MapPoint

Permanently deleted user

22 Maj 2012 01:31

In my workflow, I've got a string variable holding a string which represents a MapPoint in JSON format.  For instance, when I simulate the workflow, the string looks like this:

{ "x" : 1945761.21727366, "y" : 715756.433240193, "spatialReference" : { "wkid" : 32043 } }

But how I get that into an ESRI.ArcGIS.Client.Geometry.MapPoint is beyond me--I've been trying for hours now.  Can someone with more knowledge of .NET, Workflow Designer, and JSON lend me a hand on this?  I'd sure appreciate it.

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  Permanently deleted user

  22 Maj 2012 02:59

  Roger,

  I've never tried assigning a mappoint to a parsed value so I looked over some of the workflows that I have that get the mappoint from user input and thought perhaps the following will work:

  create a variable:

   

  esriPoint esri.arcgis.client.geometry.MapPoint

   

  jsonX  double

   

  jsonY  double

   

  jsonSpatialExtent Int32

  parse out spatialreference, x, and y from the json string

  assign

  esriPoint.X = jsonX

   

  esriPoint.Y = jsonY

   

  esriPoint.spatialreference   = new esri.ArcGIS.Client.Geometry.SpatialReference(jsonSpatialExtent)

   

   

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  Permanently deleted user

  22 Maj 2012 04:29

  Hi Roger,

      Out of curiosity, where did you get the Json from? Is it just hard coded, or did you get it from some interaction with the client? If you properly type variables as Geomety in the workflow, they would be created correctly coming from the client.

      We have some internal methods that we use in the product to get geometry from Json. I'll put in a feature request to expose it as public in the future (won't help you right now). 

  Cheers,

  Christian.

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  Permanently deleted user

  22 Maj 2012 04:52

  I knew someone would ask.  I have my own geocoding service that's specific to the city I work for.  It used to be SOAP based, but I added a REST endpoint last week.  But now that I can get a JSON response from geocoding in the URL, I don't know what to do with it.  I've tried casting the string to a MapPoint or a Geometry and many other things.  I thought it would be simple, but I guess it's not.

  As far as the parsing goes, I was hoping I could find a class that would do it for me (you know, stripping out the quotes, breaking on commas, etc.)  I did see a class called JsonReaderWriterFactory, but don't know how to use it.  I just need something to break that JSON value into pairs, and then read the X and Y.  Then I'd feel comfortable giving those to a new MapPoint.

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  Permanently deleted user

  12 Juli 2017 06:28

  Try this:

   

  Geometry geo = new MapPoint  //Assign

   

  MapPoint pt = geo.FromJson(strJson) //Cast to point

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