Snippets created by Tuomas Hietanen
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Getting a key from Windows registry
F# code to fetch a registry key
42 people like this
Like the snippet!Posted: 14 years ago by Tuomas Hietanen
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Timestamp with timezone (YYYYMMDDhhmmssffff+zzzz)
Timestamp: Time format in ISO 8601 with timezone. YYYYMMDDhhmmssffff+zzzz For example 2011-05-17 19:01:10.000 -0200 would be: 20110517190110000-0200
5 people like this
Like the snippet!Posted: 13 years ago by Tuomas Hietanen
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Simple F# ViewModel for Silverlight MVVM
Silverlight default architecture is Model-View-ViewModel. This code gives full design time support for Microsoft Expression Blend. The F# ViewModel is seen as strongly typed data source in the Blend UI. There are two properties binded to the view: HiLabel (OneWay data binding) and MyName (TwoWay data binding). ViewModel implements the INotifyPropertyChanged to support the binding. The view project (HelloApp) is made with Blend (by designers) and it is Silverlight 5.0 project. The view codebehind is c# file and it has only this.DataContext -assignment. The viewmodel project (HelloApp.ViewModel) is F# Silverlight 4.0 library. It is made with VS2010 and F# (by developers). It contains the logical functionality of the current view.
5 people like this
Like the snippet!Posted: 13 years ago by Tuomas Hietanen
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csproj-file parsing with Linq2Xml
This program reads all *.csproj-files from a path and then uses Linq2Xml to show data about the projects. This should be a good template for scripts to manage tons of c#-project files. F# and LINQ-to-XML is very powerful combination.
9 people like this
Like the snippet!Posted: 13 years ago by Tuomas Hietanen
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Team Foundation Server: Check Out a file
Team Foundation Server (TFS): Check Out a file.
3 people like this
Like the snippet!Posted: 12 years ago by Tuomas Hietanen
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Simple NumericLiteral example
You can use numeric literals, constant expressions and operator overloading to make your own arithmetics. Useful in DSL languages. With NumericLiterals, you can use any of Q, R, Z, I, N, G. Basic syntax: [Number][Letter] will forward the call to the type NumericLiteral[Letter] to FromInt32 [Number] (or FromInt64 or FromString...)
9 people like this
Like the snippet!Posted: 12 years ago by Tuomas Hietanen
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Simple builder example: Nullable
Simple Computational expressions / monad / builder -example, using .NET Nullable as demo.
3 people like this
Like the snippet!Posted: 12 years ago by Tuomas Hietanen
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Agent that can upgrade its functionality on the fly.
Agent that can upgrade its functionality on the fly. (F# MailboxProcessor containing function in the loop...)
5 people like this
Like the snippet!Posted: 11 years ago by Tuomas Hietanen
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Log file parser for log4Net files
Log file parser for log4Net files
3 people like this
Like the snippet!Posted: 11 years ago by Tuomas Hietanen
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String.notNullOrEmpty extension to strings
String.notNullOrEmpty extension to strings
2 people like this
Like the snippet!Posted: 10 years ago by Tuomas Hietanen
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Different styles of pattern matching
For tutorial, the same functionality, different styles of pattern matching.
4 people like this
Like the snippet!Posted: 10 years ago by Tuomas Hietanen
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Small quiz-game
Small quiz-game with World Bank TypeProvider (from FSharp.Data Nuget-package): Which country has the capital city of (random capital)? (Three options)
3 people like this
Like the snippet!Posted: 10 years ago by Tuomas Hietanen
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Word count analyzer
Analyse word count from files. You can use it e.g. to create Tag Clouds
3 people like this
Like the snippet!Posted: 10 years ago by Tuomas Hietanen
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Musical Note Frequencies
With the usual Western music it is common to use the Equal temperament: http://en.wikipedia.org/wiki/Equal_temperament http://hyperphysics.phy-astr.gsu.edu/hbase/music/et.html Then the note frequencies are calculated by this formula. For more information: http://en.wikipedia.org/wiki/Pitch_(music) http://en.wikipedia.org/wiki/Musical_tuning#Tuning_systems
2 people like this
Like the snippet!Posted: 10 years ago by Tuomas Hietanen
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Querying NuGet via OData TypeProvider
Querying NuGet package manager via OData TypeProvider
3 people like this
Like the snippet!Posted: 9 years ago by Tuomas Hietanen
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One script to create MS-SQL-database and host OWIN Web-server with SignalR-clients
One script to create MS-SQL-database and host OWIN Web-server with SignalR-clients
1 people like this
Like the snippet!Posted: 9 years ago by Tuomas Hietanen
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F# lambda to C# LINQ Expression
F# lambda (quotation) to C# Expression
10 people like this
Like the snippet!Posted: 9 years ago by Tuomas Hietanen
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PHP compatible MD5 hash calculation
Calculate MD5 hash that can be used when interacting with a PHP-website. Note: MD5 has been cracked and shouldn't be used in new systems.
5 people like this
Like the snippet!Posted: 8 years ago by Tuomas Hietanen
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Calculate distance between two GPS latitude-longitude points.
Calculate distance between two GPS latitude-longitude points.
3 people like this
Like the snippet!Posted: 8 years ago by Tuomas Hietanen
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Way to wrap methods to transactions
1) Create TransactionScope, on Mono and in .NET, and the later one supports TransactionScopeAsyncFlowOption. 2) Then, complete the transaction automatically if no exceptions has been thrown. If Async or Task, then automatically await the result before complete without blocking the thread.
3 people like this
Like the snippet!Posted: 8 years ago by Tuomas Hietanen
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Parse currency conversion rates from European Central Bank
Fetch EUR based currency rates of the day.
1 people like this
Like the snippet!Posted: 8 years ago by Tuomas Hietanen
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Concurrent Memoization
This is more generic variant of http://www.fssnip.net/c4 if you want to memoize over different functions / code paths that calls the same to-be-cached-code.
7 people like this
Like the snippet!Posted: 8 years ago by Tuomas Hietanen
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Concurrent Memoization with Timeout
This is variant of http://www.fssnip.net/sA that is having a time-out. You may want to use this if you e.g. cache a database query result or other mutable data source.
3 people like this
Like the snippet!Posted: 8 years ago by Tuomas Hietanen
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Bitcoin current price data from blockchain.info
Using FSharp.Data
2 people like this
Like the snippet!Posted: 7 years ago by Tuomas Hietanen
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Using machine learning tool Accord.Net from F#
This example uses the same data and methods as http://accord-framework.net/docs/html/T_Accord_Statistics_Models_Regression_LogisticRegression.htm
8 people like this
Like the snippet!Posted: 7 years ago by Tuomas Hietanen
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Function to get all possible combinations
Function to get all possible combinations of list items. There are some Euler problems (like 77 & 78) to get total amounts. But e.g. for some card game implementations you will need the real items.
4 people like this
Like the snippet!Posted: 7 years ago by Tuomas Hietanen
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Wine-quality decision-tree using Accord.Net
Wine-quality decision-tree using machine-learning tool Accord.Net with F#
1 people like this
Like the snippet!Posted: 7 years ago by Tuomas Hietanen
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More parallel option for nonce checking in NBitcoin block-chain` for http://www.fssnip.net/7RY
More parallel calculating alternative option for ``mine to correct`` for http://www.fssnip.net/7RY/title/Using-NBitcoin-to-create-private-BlockChain-with-F-FSharp
0 people like this
Like the snippet!Posted: 7 years ago by Tuomas Hietanen
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FTPS download and upload a file
FTPS = SSL encrypted FTP. SFTP = FTP over SSH.
9 people like this
Like the snippet!Posted: 7 years ago by Tuomas Hietanen
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Async computation with cancellation timeout
Async.Start with timeout in seconds
3 people like this
Like the snippet!Posted: 6 years ago by Tuomas Hietanen
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Mailbox processor that won't die on errors
Sometimes mailboxprocessor may corrupt on errors and the state is not clear. Sometimes you don't care about the existing queue, but you want to have always a processor listening.
1 people like this
Like the snippet!Posted: 6 years ago by Tuomas Hietanen
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BTC transfers with NBitcoin
Bitcoin transfers. I'm not responsible if your money gets lost. Have fun!
2 people like this
Like the snippet!Posted: 5 years ago by Tuomas Hietanen
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Basic F# LINQ GroupBy example and multiple aggregates
Converting F# LINQ queries to SQL: - Basic example of simple group-by - Also if you want to have multiple aggregates (SUM, COUNT, MAX, MIN, AVG, ...) in the same SQL-clause, that is done with groupBy over a constant value.
2 people like this
Like the snippet!Posted: 5 years ago by Tuomas Hietanen
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Coding with Emojis
In Windows you can press WindowsKey & dot to open Emoji menu.
8 people like this
Like the snippet!Posted: 4 years ago by Tuomas Hietanen
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Convert an object to json, and json to object
There is a namespace System.Runtime.Serialization.Json To serialize generic object you can do like this...
3 people like this
Like the snippet!Posted: 3 years ago by Tuomas Hietanen
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Decrypting a Rijndael string
This F# code decrypts an encrypted string using Rijndael symmetric encryption algorithm. It uses key and initialization vector stored in a registry key.
2 people like this
Like the snippet!Posted: 2 years ago by Tuomas Hietanen
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Parse bindingRedirects with Linq2Xml
Find binding-redirects with linq-to-xml from a .config file. This might be useful for then parsing config-changes e.g. by System.Linq.Enumerable.Except
4 people like this
Like the snippet!Posted: 1 year ago by Tuomas Hietanen
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Making QR-code image having contact information (VCard) with Google Chart API
Making QR-code image having contact information (VCard) with Google Chart API. If you scan this image with mobile phone, you can directly add new person to your contacts.
7 people like this
Like the snippet!Posted: 6 months ago by Tuomas Hietanen
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Get Stock Quote Data and Historical Stock Prices from Yahoo Finance
Get Stock Quote Data and Historical Stock Prices from Yahoo Finance.
237 people like this
Like the snippet!Posted: 13 years ago by Tuomas Hietanen
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SHA512 hash code from a string
Generates SHA512 hash code from a string. Usually used in some kind of validity checks, e.g. check first timestamp and then check SHA-hash over id and timestamp to ensure a valid session.
4 people like this
Like the snippet!Posted: 13 years ago by Tuomas Hietanen
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Silverlight asynchronous WebService call with UI-thread syncronization dispatcher
You can use this code to make a async WebRequest from Silverlight to update ViewModel.
5 people like this
Like the snippet!Posted: 13 years ago by Tuomas Hietanen
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Simple Reactive Extensions Example
Subject is a class that implements both IObservable<'T> and IObserver<'T>
6 people like this
Like the snippet!Posted: 13 years ago by Tuomas Hietanen
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csproj-file parsing with Linq2Xml - part 2
This program reads all *.csproj-files from a path and then uses Linq2Xml to show or modify data about the projects. This should be a good template for scripts to manage tons of c#-project files. F# and LINQ-to-XML is very powerful combination.
7 people like this
Like the snippet!Posted: 12 years ago by Tuomas Hietanen
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F# 3.0 - EntityFramework Type Provider usage with Northwind DB
A small sample how to use F# 3.0 Entity Framework (EF) Type Provider. Visual Studio 11 Beta (and Northwind sample database) needed.
5 people like this
Like the snippet!Posted: 12 years ago by Tuomas Hietanen
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Yet another Fibonacci
In mathematics, the Fibonacci numbers or Fibonacci series or Fibonacci sequence are the numbers in the following integer sequence: [0; 1; 1; 2; 3; 5; 8; 13; 21; 34; 55; 89; 144; 233; 377; ...] http://en.wikipedia.org/wiki/Fibonacci_number
5 people like this
Like the snippet!Posted: 12 years ago by Tuomas Hietanen
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Log file parsing
File parsing, based on multiple lines, using recursive pattern matching with many :: (cons) operator
2 people like this
Like the snippet!Posted: 11 years ago by Tuomas Hietanen
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Actors with control actor
Actors with control actor. No mutable state.
3 people like this
Like the snippet!Posted: 11 years ago by Tuomas Hietanen
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Set timeout or cancel
Using task based async, won't block the thread.
2 people like this
Like the snippet!Posted: 10 years ago by Tuomas Hietanen
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Simple example how to use option type
For tutorial, example how to use option type.
3 people like this
Like the snippet!Posted: 10 years ago by Tuomas Hietanen
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Using Azure Table Storage
Using Azure Table Storage with WindowsAzure.Storage
3 people like this
Like the snippet!Posted: 10 years ago by Tuomas Hietanen
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Microsoft Kinect Body Basics with Kinect SDK 2.0 and F#
Microsoft Kinect Body Basics with Kinect SDK 2.0 and F-Sharp
7 people like this
Like the snippet!Posted: 10 years ago by Tuomas Hietanen
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Parallel fold
Idea from Guy L. Steele - Organizing Functional Code for Parallel Execution; or, foldl and foldr Considered Slightly Harmful - https://vimeo.com/6624203
9 people like this
Like the snippet!Posted: 9 years ago by Tuomas Hietanen
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Getting started with Akka.NET
Getting started with Akka.NET
7 people like this
Like the snippet!Posted: 9 years ago by Tuomas Hietanen
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Takes an array and splits it to arrays of arrays
To avoid too huge lists when doing recursion, SQL-IN-clauses, etc... Use the F# core version: chunkBySize
2 people like this
Like the snippet!Posted: 9 years ago by Tuomas Hietanen
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OWIN Self-Host web-server
Simple OWIN Self-Host web-server with static files support and request deflate/gzip compression.
3 people like this
Like the snippet!Posted: 8 years ago by Tuomas Hietanen
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Get local IPv4-address of the computer
Get local IPv4-address of the computer
1 people like this
Like the snippet!Posted: 8 years ago by Tuomas Hietanen
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Sending an email
Quite similar to http://www.fssnip.net/eg but authentication, html-messages and async sending.
4 people like this
Like the snippet!Posted: 8 years ago by Tuomas Hietanen
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Encrypting a Rijndael string
Counter part for http://www.fssnip.net/1n
4 people like this
Like the snippet!Posted: 8 years ago by Tuomas Hietanen
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Correct and Incorrect Way to Use ConcurrentDictionary
Correct and Incorrect Way to Use ConcurrentDictionary
8 people like this
Like the snippet!Posted: 8 years ago by Tuomas Hietanen
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Generate rss feed from F# record items
Generate rss news feed from a list of F# record items using Linq2Xml. To use e.g. to generate feeds from your web server.
2 people like this
Like the snippet!Posted: 8 years ago by Tuomas Hietanen
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Generating GraphViz images using C# wrapper.
How you can programmatically use GraphViz from F#.
8 people like this
Like the snippet!Posted: 8 years ago by Tuomas Hietanen
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Using NBitcoin to create private BlockChain with F# (FSharp)
This is just an initial example / tech-demo.
4 people like this
Like the snippet!Posted: 7 years ago by Tuomas Hietanen
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Visual Studio 2017 extension: Displaying Light Bulb Suggestions
Example follows this, translated to FSharp: https://msdn.microsoft.com/en-us/library/dn903708.aspx Just instead of copy&pasting C#, add a new F# class library and paste this code to there, then add that to reference to your C#-project.
3 people like this
Like the snippet!Posted: 7 years ago by Tuomas Hietanen
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Fetch GitHub download count for a file in a repo
GitHub has a public JsonApi to expose file download count.
0 people like this
Like the snippet!Posted: 7 years ago by Tuomas Hietanen
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Average Square Error
In statistics, one of the standard ways to calculate an estimate/estimation quality, to be able to compare how good are different estimates.
1 people like this
Like the snippet!Posted: 7 years ago by Tuomas Hietanen
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SFTP with SSH.Net
SFTP with SSH.Net
4 people like this
Like the snippet!Posted: 7 years ago by Tuomas Hietanen
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Emailage email fraud detection query
Emailage email fraud detection query, using https://www.emailage.com/ Supports emails and IPs.
0 people like this
Like the snippet!Posted: 6 years ago by Tuomas Hietanen
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Send async HTTP POST request
Bit like http://www.fssnip.net/a7 but send as async.
3 people like this
Like the snippet!Posted: 6 years ago by Tuomas Hietanen
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Parsing UserAgent strings with FSharp
Identify user's browser, Os and device by the browser's UserAgent string.
3 people like this
Like the snippet!Posted: 5 years ago by Tuomas Hietanen
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Harshad numbers / Niven numbers
As described in https://en.wikipedia.org/wiki/Harshad_number
1 people like this
Like the snippet!Posted: 5 years ago by Tuomas Hietanen
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F# LINQ-Expression-tree visitor
A simple expression tree visitor, to inject a lambda inside another lambda parameters.
4 people like this
Like the snippet!Posted: 5 years ago by Tuomas Hietanen
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Using PKCS#11 interface via F#, Pkcs11Interop and Soft-HSM2
Initial example of using PKCS#11 from F#
1 people like this
Like the snippet!Posted: 4 years ago by Tuomas Hietanen
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PGP F# with PGPCore
PGP F# with PGPCore https://blog.bitscry.com/2018/07/05/pgp-encryption-and-decryption-in-c/
0 people like this
Like the snippet!Posted: 2 years ago by Tuomas Hietanen
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Random-key-generator and Base-58-encoding
Generate random hex-string and calculate base58encode. I made these for some initial BTC-testing, but didn't test too much... seems to work, but would need some unit-tests... :-) Feel free to update or add new versions.
7 people like this
Like the snippet!Posted: 2 years ago by Tuomas Hietanen
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Using Utf8JsonReader from System.Text.Json with FSharp
High-performance JSON parsing with System.Text.Json and F#
1 people like this
Like the snippet!Posted: 1 year ago by Tuomas Hietanen
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String.Join with pipe
Just use the concat
0 people like this
Like the snippet!Posted: 10 days ago by Tuomas Hietanen