What are some examples of secondary sources? Newspapers encyclopedias, dictionaries and textbooks are all examples of secondary sources. Another answer A secondary source can be explained most coherently by startin…g with the definition of a primary source: A primary source is written or created by a person.
My answer is a bit lengthy but I think it is important to compare view models to other types of commonly used models to understand why they are different and why they are necessary.
To summarize, and to directly answer the question that is asked: Generally speaking, a view model is an object that contains all the properties and methods necessary to render a view.
View model properties are often related to data objects such as customers and orders and in addition they also contain properties related to the page or application itself such as user name, application name etc.
View models provide a convenient object to pass to a rendering engine to create a html page. One of many reasons to use a view model is that view models provide a way to unit test certain presentation tasks such as handling user input, validating data, retrieving data for display, etc.
Here is a comparison of Entity models a. Data Transfer Objects a. This makes them of limited use for presenting data.
However, for certain simple data structures they often do quite well. Presentation models often represent a denormalized view of data.
Characteristics of Presentation Models: Code is typically limited to formatting data or converting to or from a DTO. Presentation Models should not contain business logic. For example dollar amounts may be represented as strings so they can contain commas and a currency symbol.
In other words, a simple DTO that is used as the backing model for rendering a grid is in fact also a presentation model in the context of that grid. A presentation model may be used to model data for an entire page, a grid on a page, or a dropdown on a grid on a page.
Presentation models often contain properties that are other presentation models. Presentation models are often constructed for a single-use purpose such as to render a specific grid on a single page. An example presentation model: Characteristics of View Models: Usually this means that a view model will expose every property that any control on the page will need to render itself correctly.
Making the view model the single source of data for the view greatly improves its capability and value for unit testing. This characteristic is crucial when designing the view model for reusability and is discussed in the examples below. View Models usually contain methods that are called during rendering and when the user is interacting with the page.
This code typically relates to event handling, animation, visibility of controls, styling, etc. This code is often mistakenly placed in a controller. Calling business services from a controller usually limits the usefulness of the view model for unit testing. To be clear, view models themselves should not contain business logic but should make calls to services which do contain business logic.
A unique View Model is typically written for every page or screen in an application. View Model Composition As stated earlier, view models are composite objects in that they combine application properties and business data properties on a single object.
Examples of commonly used application properties that are used on view models are: The following examples show why the composite nature of view models is important and how we can best construct a View Model that efficient and reusable. Assume we are writing a web application. One of the requirements of the application design is that the page title, user name, and application name must be displayed on every page.
If we want to create a page to display a presentation order object, we may modify the presentation model as follows: Also, what if we want to define some page-level logic in the constructor of the class?Higher History source questions - evaluate the usefulness questions 1.
Higher History exam How to answer Evaluate the usefulness Mr Marr History. Example source Answers for usefulness and reliability for Modern History Analyzing a Company’s Resources and Competitive Position lusitanian-hispanic rivelry in Maritime Discoveries.
GCSE History example answers and commentaries, Paper 1B/D Commentary – Level 4 The response addresses each source and explains the usefulness of the content and.
Aug 18, · Give an example of a source of post-secondary information and analyze its overall usefulness and reliability.? Follow. 1 answer 1. Report Abuse 7 answers Was the year prior or post the 90s? 8 answers Status: Resolved.
However, if you are discussing, for example, the historical context in which the episode originally aired, you should cite the full date. Because you are specifying the date of airing, you would then use WB Television Network (rather than Mutant Enemy), because it was the network (rather than the production company) that aired the episode on the date you’re citing.
Fundamentals Level – Skills Module, Paper F9 Financial Management June Answers Section A 1A 2D 3D Mean growth in earnings per share = x [(35·7/30·0)1/3– 1] = 5·97% or 6% 4A.