Tutorial by Examples: c

MyPage.cs

using System; using Xamarin.Forms; namespace contact_picker { public class MyPage : ContentPage { Button button; public MyPage () { button = new Button { Text = "choose contact" }; button....

Xamarin.Forms • Contact Picker - Xamarin Forms (Android and iOS)

ChooseContactPicker.cs

using System; using Xamarin.Forms; namespace contact_picker { public class ChooseContactPage : ContentPage { public ChooseContactPage () { } } }

Xamarin.Forms • Contact Picker - Xamarin Forms (Android and iOS)

using Android.App; using Android.OS; using Android.Content; using Android.Database; using Xamarin.Forms; namespace contact_picker.Droid { [Activity (Label = "ChooseContactActivity")] public class ChooseContactActivity : Activity { public string type_num...

Xamarin.Forms • Contact Picker - Xamarin Forms (Android and iOS)

MainActivity.cs

using System; using Android.App; using Android.Content; using Android.Content.PM; using Android.Runtime; using Android.Views; using Android.Widget; using Android.OS; using Xamarin.Forms; namespace contact_picker.Droid { [Activity (Label = "contact_picker.Droid", Icon = &...

Xamarin.Forms • Contact Picker - Xamarin Forms (Android and iOS)

ChooseContactRenderer.cs

using UIKit; using AddressBookUI; using Xamarin.Forms; using Xamarin.Forms.Platform.iOS; using contact_picker; using contact_picker.iOS; [assembly: ExportRenderer (typeof(ChooseContactPage), typeof(ChooseContactRenderer))] namespace contact_picker.iOS { public partial class Choose...

Xamarin.Forms • Contact Picker - Xamarin Forms (Android and iOS)

Select: Project selected columns

Sample table (say Employee) structure Column NameDatatypeIDINTF_NameSTRINGL_NameSTRINGPhoneSTRINGAddressSTRING Project all the columns Use wild card * to project all the columns. e.g. Select * from Employee Project selected columns (say ID, Name) Use name of columns in the projection list. e...

hive • SELECT Statement

Common HTML Operations

If the input HTML DOM is <html> <body> <a>link</a> <div class='container' id='divone'> <p class='common' id='enclosedone'>Element One</p> <p class='common' id='enclosedtwo'>Element Two</p> ...

xpath • Getting started with xpath

Convert px to (r)em

To convert px to em or rem you can use the following function: @function rem-calc($size, $font-size : $font-size) { $font-size: $font-size + 0px; $remSize: $size / $font-size; @return #{$remSize}rem; } @function em-calc($size, $font-size : $font-size) { $font-size: $font-siz...

sass • Convert units

Creating custom interceptors

Interceptors require the IInterceptor interface. Any public method within the intercepted class will be intercepted (including getters and setters) public class MyInterceptor : IInterceptor { public void Intercept(IInvocation invocation) { //Calls the next method in the chain - T...

castle-windsor • Interceptors

Accessing a filtered list from outside an ng-repeat

Occasionally you will want to access the result of your filters from outside the ng-repeat, perhaps to indicate the number of items that have been filtered out. You can do this using as [variablename] syntax on the ng-repeat. <ul> <li ng-repeat="item in vm.listItems | filter:vm.myF...

AngularJS • Filters

Database First in Entity Framework Core with a Class Library and SQL Server

Okay it took me about a day to figure it out so here I am posting the steps I followed to get my Database First working in a Class Project (.NET Core), with a .NET Core Web App. Step 1 - Install .NET Core Make Sure you are using .NET Core not DNX (Hint: You should be able to see the .NET Core opti...

Entity Framework Core • Getting started with Entity Framework Core

Bower dependancy

To automatically install bower and its components, one must Specify the bower dependency in package.json: "dependencies": { "bower": "^1.7.9" } Use scripts to execute a postinstall command "scripts": { "postinstall": "./...

heroku • Dependencies

simple daemon application

A daemon process executes a program in the background, usually without user interaction. The example below shows how to create a daemon and register a listener, which monitors all open applications. The main part is the function call NSRunLoop.mainRunLoop().run(), which starts the daemon. class MyO...

osx • NSRunLoop

Route Constraints

Route constraints let you restrict how the parameters in the route template are matched. The general syntax is {parameter:constraint}. For example: // eg: /users/5 [Route(“users/{id:int}”] public ActionResult GetUserById(int id) { … } // eg: users/ken [Route(“users/{name}”] public ActionRes...

asp.net-mvc-5 • Attribute routing in mvc-5

Raspberry Pi Introduction - Hello World in C

Pretext This is an introduction to the Hello World program example on the Raspberry Pi written in C. The following example makes use of the command line interface and is set up as a step-by-step guide. Along with creating a Hello World program, the reader will be introduced to simple linux comman...

Raspberry Pi • Getting started with Raspberry Pi

Child to Parent Components

Sending data back to the parent, to do this we simply pass a function as a prop from the parent component to the child component, and the child component calls that function. In this example, we will change the Parent state by passing a function to the Child component and invoking that function ins...

React • Communication Between Components

color-output.sh

In the opening section of a bash script, it's possible to define some variables that function as helpers to color or otherwise format the terminal output during the run of the script. Different platforms use different character sequences to express color. However, there's a utility called tput whic...

Bash • Color script output (cross-platform)

Active records with sub queries

Example: Customers who can create a post. Each customer can create multiple posts. As soon as customer creates the post, post will be under administrators review. Now we have to fetch the customers list who have all active posts by using sub-query. Note: If a customer has 5 post, among 5 posts if h...

yii2 • Active Record

Cascade Classifiers to detect face with Java

Java Code import org.opencv.core.Mat; import org.opencv.core.MatOfRect; import org.opencv.core.Point; import org.opencv.core.Rect; import org.opencv.core.Scalar; import org.opencv.highgui.Highgui; import org.opencv.highgui.VideoCapture; import org.opencv.objdetect.CascadeClassifier; publ...

opencv • Cascade Classifiers

Create a simple self-hosted Nancy application

Use Nuget to install the Nancy and Nancy.Hosting.Self packages into the project. Instantiate a new NancyHost object and pass in the relevant URL using( var host = new NancyHost( hostConfiguration, new Uri( "http://localhost:1234" ) ) ) { host.Start(); Console.WriteLine( "Running o...

nancy • Getting started with nancy