properties - w3toppers.com

How to check whether all properties of an object are null or empty?

You can do it using Reflection bool IsAnyNullOrEmpty(object myObject) { foreach(PropertyInfo pi in myObject.GetType().GetProperties()) { if(pi.PropertyType == typeof(string)) { string value = (string)pi.GetValue(myObject); if(string.IsNullOrEmpty(value)) { return true; } } } return false; } Matthew Watson suggested an alternative using LINQ: return myObject.GetType().GetProperties() .Where(pi => pi.PropertyType == typeof(string)) .Select(pi => (string)pi.GetValue(myObject)) .Any(value => string.IsNullOrEmpty(value));

How can I access object properties with names like integers or invalid property names?

Updated for PHP 7.2 PHP 7.2 introduced a behavioral change to converting numeric keys in object and array casts, which fixes this particular inconsistency and makes all the following examples behave as expected. One less thing to be confused about! Original answer (applies to versions earlier than 7.2.0) PHP has its share of dark alleys … Read more

Swift: Failed to assign value to a property of protocol?

You have to define the protocol as a class protocol: protocol ValueProvider : class { var value: String {get set} } Then var value: String { get { return v.value } set { v.value = newValue } } compiles and works as expected (i.e. assigns the new value to the object referenced by v1 if … Read more

How to observe all object property changes?

You can observe isDirty to see if any of the object’s values have been modified since last save (if you are using Ember Data). Alternatively you can pass a comma separated list of properties to observes. This might be long if you have a lot of properties on your object, but will work. A third … Read more

Liferay: How to configure Liferay Portal

Liferay properties is powerful instrument that allows us to configure Portal behaviour without coding of hooks-, ext- and theme-plugin. By new requirement we proof at first for possibility to solve this requirement with change of Liferay configuration. The default properties configuration can be found at Liferay source code: https://github.com/liferay/liferay-portal/blob/master/portal-impl/src/portal.properties or in https://github.com/liferay/liferay-portal/blob/master/portal-impl/src/portal.properties or in liferay-bundles\tomcat-7\webapps\ROOT\WEB-INF\lib\portal-impl.jar … Read more

Why do I need to write @synthesize when I provide getter and setter?

When you provide both getter and setter, there is often just no need for an instance variable at all, i.e. when you just forward those messages or store data in other places. As soon as one of them is missing, the ivar is needed to synthesize that functionality. If I remember correctly, for readonly properties … Read more

How do I add/update a property inside an MSI from the command-line?

Example VBScript that you could use to update (or add) a property post-build… Option Explicit Const MSI_FILE = “myfile.msi” Dim installer, database, view Set installer = CreateObject(“WindowsInstaller.Installer”) Set database = installer.OpenDatabase (MSI_FILE, 1) ‘ Update Set view = database.OpenView (“UPDATE Property SET Value=”” & myproperty & “” WHERE Property = ‘MYPROPERTY'”) ‘ .. or Add … Read more

Is it possible to have class.property = x return something other than x?

One downside is that you would break the chained assignment semantics: $ irb irb(main):001:0> x = y = 3 => 3 irb(main):002:0> p x 3 => nil irb(main):003:0> p y 3 => nil irb(main):004:0> Consider: x = MyClass.property = 3 Then x would take true if this worked as you had expected (right-associativity). That could … Read more

Passing variables between view controllers

After performSegueWithIdentifier:sender: your view controler will call – (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender assuming your new view controller has some propertys to set: if ([[segue identifier] isEqualToString:@”NextView”]) { MyViewController *myVC = [segue destinationViewController]; myVC.propertyToSet = // set your properties here }

Access object property with disallowed character in property name

This will work: echo $object->feed->{‘xmlns$media’}; Alternatively, you can tell json_decode to return an array: $array = json_decode($json, true); echo $array[‘feed’][‘xmlns$media’];