Tutorial by Examples: le

Let's create a small piece of code that throws an exception: private void button1_Click(object sender, EventArgs e) { string msg = null; msg.ToCharArray(); } If we execute this, we get the following Exception and stack trace: System.NullReferenceException: "Object reference not...

from django.test import TestCase from myapp.forms import MyForm class MyAppTests(TestCase): def test_forms(self): form_data = {'field1': 'fieldvalue1'} form = MyForm(data=form_data) self.assertTrue(form.is_valid())

Follow following steps to try out a sample application on AWS ECS service as a proof of concept. Login to AWS management console and go to AWS service catalog - > Compute - > Ec2 Create a VM(EC2 instance) using amazon linux 64 bit OS, this we will use to configure docker, git, AWS ECS agen...

In this example, one of two different ImageViews should be translated from the ChooserFragment to the DetailFragment. In the ChooserFragment layout we need the unique transitionName attributes: <ImageView android:id="@+id/image_first" android:layout_width="wrap_content...

It has not been explained in the Tensorflow documentation how to load images and labels directly from a TXT file. The code below illustrates how I achieved it. However, it does not mean that is the best way to do it and that this way will help in further steps. For instance, I'm loading the labels ...

Django 1.9 added the Field.disabled attribute: The disabled boolean argument, when set to True, disables a form field using the disabled HTML attribute so that it won’t be editable by users. Even if a user tampers with the field’s value submitted to the server, it will be ignored in favor of t...

Progress ABL code is normally stored in files with different ending depending on what they contain. The endings are optional but rather a defacto standard: Filename extensionContains.pA Progress program. Can contain several internal procedures, functions etc.iInclude file to be included in other fi...

GameScene code example: import SpriteKit protocol GameViewControllerDelegate: class { func callMethod(inputProperty:String) } class GameScene: SKScene { weak var gameViewControllerDelegate:GameViewControllerDelegate? override func didMove(to view: SKView) { gameViewContro...

Navigate to phpMyAdmin by URL http://your_ip/phpmyadmin or http://localhost/phpmyadmin Login using username root and root password. Click on Databases tab. Enter database name, select collation (you may leave it to default) and click create. Click on Privileges tab and select "Add user a...

Online demo is here: http://ext4all.com/post/extjs-4-mvc-application-architecture.html Define a model: // /scripts/app/model/User.js Ext.define('AM.model.User', { extend: 'Ext.data.Model', fields: ['id', 'name', 'email'] }); Define a store with proxy: // /scripts/app/store/Users.js...

Flexbox or flexible box is a layout method for arranging content on a page in a predictable manner. Flexbox provides an improvement over traditional block model positioning using floats or even table like positioning for content on the page. At its core, Flexbox can be broken down into a parent ele...

There are different types of variables in Clojure: numbers Types of numbers: integers longs (numbers larger than 2^31 - 1) floats (decimals) strings collections Types of collections: maps sequences vectors functions

Combine the instances of the _IO packages, use the right one with its numeric type. with Ada.Text_IO; use Ada.Text_IO; procedure Print_Inventory is type Fruit is (Banana, Orange, Pear); subtype Count is Integer range -1_000_000 .. 1_000_000; package Fruit_IO is new Enumeration...

A simple sports2000 example: FIND FIRST Customer NO-LOCK WHERE CustNum = 1 NO-ERROR. IF AVAILABLE Customer THEN DO: DISPLAY Customer.NAME. END. ELSE DO: MESSAGE "No record available". END. FIRST - find the first record that matches the query NO-LOCK - don't lock the r...

Coding method used: Hybrid/Spongy It has been forever a myth that div's can not be used in emails. There are email clients (unlike outlook) that can render div's properly. The example below will illustrate how an email can be coded that will work on Gmail app (with updates not rolled out yet), Sams...

import grails.rest.* @Resource(uri='/books') class Book { String title static constraints = { title blank:false } } Simply by adding the Resource transformation and specifying a URI, your domain class will automatically be available as a REST resource in either XM...

# for use in npm scripts npm install electron-packager --save-dev # for use from cli npm install electron-packager -g

One can describe a line in the plane as y = a*x + b so that the line is essentially controlled by two parameters a, b. For a given line, the choice of these parameters is unique. But vertical lines cannot be described like this.

var alertResult = await DisplayAlert("Alert Title", Alert Message, null, "OK"); if(!alertResult) { //do your stuff. } Here we will get Ok click action.

First we need to provide Title service. Using setTitle import {Title} from "@angular/platform-browser"; @Component({ selector: 'app', templateUrl: './app.component.html', providers : [Title] }) export class AppComponent implements { constructor( private title: Titl...