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 with 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.

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: