How to add an attribute to a property at runtime

Don’t let someone tell you that you can’t do it. You can run for president if you want 🙂 For your convenience, this is a fully working example public class SomeAttribute : Attribute { public SomeAttribute(string value) { this.Value = value; } public string Value { get; set; } } public class SomeClass { public … Read more

Which is the best way to check for the existence of an attribute? [duplicate]

There is no “best” way, because you are never just checking to see if an attribute exists; it is always a part of some larger program. There are several correct ways and one notable incorrect way. The wrong way if ‘property’ in a.__dict__: a.property Here is a demonstration which shows this technique failing: class A(object): … Read more

When is a custom attribute’s constructor run?

When is the constructor run? Try it out with a sample: class Program { static void Main(string[] args) { Console.WriteLine(“Creating MyClass instance”); MyClass mc = new MyClass(); Console.WriteLine(“Setting value in MyClass instance”); mc.Value = 1; Console.WriteLine(“Getting attributes for MyClass type”); object[] attributes = typeof(MyClass).GetCustomAttributes(true); } } [AttributeUsage(AttributeTargets.All)] public class MyAttribute : Attribute { public MyAttribute() … Read more

How do you tell if a checkbox is selected in Selenium for Java?

If you are using Webdriver then the item you are looking for is Selected. Often times in the render of the checkbox doesn’t actually apply the attribute checked unless specified. So what you would look for in Selenium Webdriver is this isChecked = e.findElement(By.tagName(“input”)).Selected; As there is no Selected in WebDriver Java API, the above … Read more

Objective C – Assign, Copy, Retain

Updated Answer for Changed Documentation The information is now spread across several guides in the documentation. Here’s a list of required reading: Cocoa Core Competencies: Declared property Programming with Objective-C: Encapsulating Data Transitioning to ARC Release Notes Advanced Memory Management Programming Guide Objective-C Runtime Programming Guide: Declared Properties The answer to this question now depends … Read more

Storing and Accessing node attributes python networkx

As you say, it’s just a matter of adding the attributes when adding the nodes to the graph G.add_node(‘abc’, dob=1185, pob=’usa’, dayob=’monday’) or as a dictionary G.add_node(‘abc’, {‘dob’: 1185, ‘pob’: ‘usa’, ‘dayob’: ‘monday’}) To access the attributes, just access them as you would with any dictionary G.node[‘abc’][‘dob’] # 1185 G.node[‘abc’][‘pob’] # usa G.node[‘abc’][‘dayob’] # monday … Read more

What is initial scale, user-scalable, minimum-scale, maximum-scale attribute in meta tag?

They are viewport meta tags, and is most applicable on mobile browsers. width=device-width This means, we are telling to the browser “my website adapts to your device width”. initial-scale This defines the scale of the website, This parameter sets the initial zoom level, which means 1 CSS pixel is equal to 1 viewport pixel. This … Read more

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