Tutorial by Examples: u

[Range(min,max)] attribute

Specifies a numeric minimum and maximum range for a property using System.ComponentModel.DataAnnotations; public partial class Enrollment { public int EnrollmentID { get; set; } [Range(0, 4)] public Nullable<decimal> Grade { get; set; } } If we try to insert/upd...

Entity Framework • Code First DataAnnotations

[DatabaseGenerated] attribute

Specifies how the database generates values for the property. There are three possible values: None specifies that the values are not generated by the database. Identity specifies that the column is an identity column, which is typically used for integer primary keys. Computed specifies that th...

Entity Framework • Code First DataAnnotations

[NotMapped] attribute

By Code-First convention, Entity Framework creates a column for every public property that is of a supported data type and has both a getter and a setter. [NotMapped] annotation must be applied to any properties that we do NOT want a column in a database table for. An example of a property that we ...

Entity Framework • Code First DataAnnotations

[Table] attribute

[Table("People")] public class Person { public int PersonID { get; set; } public string PersonName { get; set; } } Tells Entity Framework to use a specific table name instead of generating one (i.e. Person or Persons) We can also specify a schema for the table using [T...

Entity Framework • Code First DataAnnotations

[Column] attribute

public class Person { public int PersonID { get; set; } [Column("NameOfPerson")] public string PersonName { get; set; } } Tells Entity Framework to use a specific column name instead using the name of the property. You can also specify the database data type a...

Entity Framework • Code First DataAnnotations

[Index] attribute

public class Person { public int PersonID { get; set; } public string PersonName { get; set; } [Index] public int Age { get; set; } } Creates a database index for a column or set of columns. [Index("IX_Person_Age")] public int Age { get; set; } This creates ...

Entity Framework • Code First DataAnnotations

Find existing ScriptableObjects during runtime

To find active ScriptableObjects during runtime, you can use Resources.FindObjectsOfTypeAll(). T[] instances = Resources.FindObjectsOfTypeAll<T>(); Where T is the type of the ScriptableObject instance you're searching. Active means it has been loaded in memory in some form before. This me...

unity3d • ScriptableObject

Use Option<'T> over null values

In functional programming languages like F# null values are considered potentially harmful and poor style (non-idiomatic). Consider this C# code: string x = SomeFunction (); int l = x.Length; x.Length will throw if x is null let's add protection: string x = SomeFunction (); int l = x ...

F# • Option types

Option Module enables Railway Oriented Programming

Error handling is important but can make an elegant algorithm into a mess. Railway Oriented Programming (ROP) is used to make error handling elegant and composable. Consider the simple function f: let tryParse s = let b, v = System.Int32.TryParse s if b then Some v else None let f (g : ...

F# • Option types

Update a Node

MATCH (n) WHERE n.some_attribute = "some identifier" SET n.other_attribute = "a new value"

neo4j • Cypher

Using XML Configuration to set up Hibernate

I create a file called database-servlet.xml somewhere on the classpath. Initially your config file will look like this: <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/...

hibernate • Getting started with hibernate

Build your own Linq operators for IEnumerable

One of the great things about Linq is that it is so easy to extend. You just need to create an extension method whose argument is IEnumerable<T>. public namespace MyNamespace { public static class LinqExtensions { public static IEnumerable<List<T>> Batch<T&...

C# Language • LINQ Queries

Remove extra paddings to fit to a precisely measured text.

UITextView has extra paddings by default. Sometimes it's annoying especially if you want to measure some text without view instance and place them at some area precisely. Do this to remove such paddings. messageTextView.textContainerInset = UIEdgeInsetsZero messageTextView.textContainer.lineFragm...

iOS • UITextView

Uploading a Conda Package

Before starting you must have: Anaconda installed on your system Account on Binstar If you are not using Anaconda 1.6+ install the binstar command line client: $ conda install binstar $ conda update binstar If you are not using Anaconda the Binstar is also available on pypi: $ pip install bin...

Python Language • Deployment

Setup for Specflow

Pre -Requsite: Download Visual Studio IDE Create a new project Install specflow visual studio integration, Nunit Adapter & Nunit framework Download specflow for visual studio as shown below

specflow • Getting started with specflow

Hello Web (Basic "Hello World"-type setup)

<html> <head> <script src="https://code.jquery.com/jquery-3.1.0.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script> <script src="https:...

backbone.js • Getting started with backbone.js

Reading status codes

The attribute status_code contains the status code of the response good_req = requests.get('https://api.github.com/events') code_200 = good_req.status_code notfound_req = requests.get('https://api.github.com/not_found') code_404 = notfound_req.status_code requests.codes.__dict__ will provid...

python-requests • Getting started with python-requests

Installation or Setup

We have 2 way, we can install Universal app in windows 10 devices (OS/Phone). One app works for both mobile and OS 1 Install using Power Shell command Step 1: Make sure app not have any error and developed, then right click on Universal app project in solution explorer. Step 2: Select Store and C...

win-universal-app • Getting started with win-universal-app

Deferring operations using $q.defer

We can use $q to defer operations to the future while having a pending promise object at the present, by using $q.defer we create a promise that will either resolve or reject in the future. This method is not equivalent of using the $q constructor, as we use $q.defer to promisify an existing routin...

AngularJS • Angular promises with $q service

Pre get posts filter basic usage

Sometimes you would like to change main WordPress query. Filter pre_get_posts is the way to go. For example using pre_get_posts you can tell main loop to show only 5 posts. Or to show posts only from one category, or excluding any category etc. add_action( 'pre_get_posts', 'my_callback_function' ...

WordPress • Alternating main loop (pre_get_posts filter)