F# on Marko Apfel

F#, ArcGIS Runtime and error “Cannot create unknown type '{http://schemas.esri.com/arcgis/runtime/2013}MapView'”

Tue, 14 Jul 2015 17:15:00 +0200

By playing with F# and ArcGIS Runtime I tried to re-create a sample C# project to F#.

For the WPF part I used the Visual Studio extension F# Empty Windows App (WPF) and F# Windows App (WPF, MVVM) the NuGet packages FSharp.ViewModule.Core and FsXaml for WPF.

Visual Studio – Getting compilation error “The type 'XAML' is not defined.”

Thu, 09 Jul 2015 06:34:00 +0200

During compilation of the F# Empty Windows App (WPF) I got that error (check the output pane carefully).

image

To solve this issue you have to thrust of the XAML Type Provider of this project. This you can do via the Visual Studio options:

Productive work environments for F# development (under windows)

Sat, 04 May 2013 07:30:00 +0200

IDEs, Editors, ..

Here are my favorites in descend order

Visual Studio Express 2012 for Web yes! - it allows you free F# development, notably for libraries
LINQPad again and again a wonderful tool!
SharpDevelop sometimes a little bit idiosyncratic
Online Scratchpad on TryFSharp.org the fastest start …

Additional resources

Maybe the following packages are necessary or in minimum useful:

SharpDevelop, F#, missing “Send to F# Interactive” context menu

Wed, 01 May 2013 05:15:00 +0200

Situation, Problem

During playing a little bit with these WPF MVC F# projects inside SharpDevelop I stumbled over the situation, that I could not send F# snippets to the interactive window. The menu was not available.

SharpDevelop, F#, “Please ensure that the F# compiler is installed on your computer.”

Wed, 01 May 2013 04:18:00 +0200

Situation

My private machine has Microsoft Visual Studio Express 2012 for Windows Desktop. This Visual Studio edition doesn’t allow to develop with F#. So I installed additionally SharpDevelop.

But it took longer as expected to get F# projects running in this environment.

Wie spricht man den Lambda-Operator aus?

Wed, 05 May 2010 09:27:00 +0200

Da gibt es unterschiedliche Auffassungen.

Im Englischen:

Func f = x => x * 2; ”x goes to x * 2” ”x maps to x * 2” ”x becomes x * 2” ”x induces x * 2”
Func test = c => c.City == “London”; “c for which c.City equals London”

Im Deutschen:

F# and ArcObjects, Part 3

Fri, 26 Mar 2010 13:15:00 +0100

Today i played a little bit with IFeature-sequences and piping data. The result was a calculator of the bounding box around all features in a feature class.

Maybe a little bit dirty, but for learning was it OK. ;-)

F# and ArcObjects, Part 2

Thu, 25 Mar 2010 14:49:00 +0100

After accessing one feature now i iterate through all features of a feature class:

open System;;



#I "C:\Program Files\ArcGIS\DotNet";;

#r "ESRI.ArcGIS.System.dll";;

#r "ESRI.ArcGIS.DataSourcesGDB.dll";;

#r "ESRI.ArcGIS.Geodatabase.dll";;

open ESRI.ArcGIS.esriSystem;;

open ESRI.ArcGIS.DataSourcesGDB;;

open ESRI.ArcGIS.Geodatabase;;



let aoInitialize = new AoInitializeClass();;



let status = aoInitialize.Initialize(esriLicenseProductCode.esriLicenseProductCodeArcEditor);;



let workspacefactory = new SdeWorkspaceFactoryClass();;



let connection = "SERVER=okul;DATABASE=p;VERSION=sde.default;INSTANCE=sde:sqlserver:okul;USER=s;PASSWORD=g";;



let workspace = workspacefactory.OpenFromString(connection, 0);;



let featureWorkspace = (box workspace) :?> IFeatureWorkspace;;



let featureClass = featureWorkspace.OpenFeatureClass("Praxair.SFG.BP_L_ROHR");;



let queryFilter = new QueryFilterClass();;



let featureCursor = featureClass.Search(queryFilter, true);;



let featureCursorSeq (featureCursor : IFeatureCursor) = 

 let actualFeature = ref (featureCursor.NextFeature())

 seq {

 while (!actualFeature) <> null do
 yield actualFeature

 do actualFeature := featureCursor.NextFeature()

 };;

 

featureCursorSeq featureCursor

|> Seq.iter (fun feature -> Console.WriteLine ((!feature).OID));;

F# and ArcObjects, Part 1

Thu, 25 Mar 2010 10:58:00 +0100

After having a first look on F# its time to ask: How could i use F# with ArcObjects.

So my first steps was to do something with a feature in a F# interactive session. And these are my first code lines:

Integrating F# in SharpDevelop

Wed, 24 Mar 2010 13:10:00 +0100

After installing SharpDevelop 4 the F# Interactive could not be activated.

In my case the correct folder for the F# installation must by specified in die application config file. So i opened SharpDevelop.exe.config and set this entry in the appSettings section: