Data driven applications with mvvm

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Data Driven Applications with MVVM book. Read reviews from world's largest community for readers. This ebook covers what MVVM is and how to use it in pra. . Data Driven Applications with MVVM eBook: Zoltan Arvai, SilverlightShow Team: Kindle Store. Having trouble choosing the right book? We can help! We provide book ratings from various sources, all in one place, to help You decide!.

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In this article I will discuss about the WPF MVVM(Model-View-View Model) design pattern. I will create a simple data driven live application in. All about Data Driven Applications with MVVM by Zoltan Arvai. LibraryThing is a cataloging and social networking site for booklovers. This MVVM tutorial will give you an intro to the Model-View-ViewModel We'll start with the basic building block that is key for all applications: data and information. . You can see an example of this in Rob Eisenberg's convention- based.

MVVM is a simple design pattern which keeps the logical layers of application separate from each other. The examples of the pattern often focus on XAML for the view definition and data-binding for commands and properties. In MVVM, the view is active. I have set the datacontext of the Grid as SelectedPerson which contains all these properties. I am using a message box to confirm the delete.

Data Driven Applications with MVVM

In this example I will create a simple application which can be used to display, add, update or delete data. The UI for the application is as shown below.

I will discuss all these parts here one by one. I have used Entity Framework to talk to database. You can visit my two articles to get starting with EF.

My MainWindow. The code for the MainWindow. In the above code you can see at row number 11 that I am assigning data context for this view. The data context is the MainWindowViewModel. As you can see there is not much code in the code behind file.

Apart from the handler assignment to an event named ShowMessageBox which I will discuss later. In the figure I have marked all the data bindings with black arrow.

For PersonCollection. This view model contains the properties named PersonCollection and SelectedPerson. It also contains the Add, Save and Delete commands. I have set the datacontext of the Grid as SelectedPerson which contains all these properties. SelectedPerson property is of type Person class. It contains instance of the Business class as well as the Person Model class.

All the properties bound to the View are present here. Commands are also present in the Model class which are of type RelayCommand which I have discussed later in the article. This class contains a reference to the Business class and a property of type Person model named as SelectedPerson.

Business class allows us to interact with data source and contains all the business logic. Person is the model class. Business class has the logic to populate the Model class and interact with View Model. PersonDB is the class which contains logic to interact with the Entity Framework. The code for all of them is as follow.

With data driven mvvm applications

There is not much business logic in this application. But I have put the validation of checking for null of emptiness of the fields as business logic. These are the classes which are building blocks of various functionalities. Notification class can be derived to any class which wants to use the INotifyPropertyChanged functionality.

Applications data mvvm driven with

RelayCommand class contains the logic to create and instance of ICommand interface. It binds to the Command of the controls in the View.

If I run the application and click on update button without doing any other action. I will get the pop up as shown below. The popup is called using an event which is present in the View model. The handler for the event is present in the MainWindow.

Data Driven Applications with MVVM by Zoltán Árvai

If you want to Update a record. If you want to delete record. All the three layers are based on the principles which we have discussed earlier in the article. If you do any of the operations you will be able to see the result of the same in the application UI. Want to Read saving…. Want to Read Currently Reading Read.

With data mvvm applications driven

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Details if other: Thanks for telling us about the problem. Return to Book Page. SilverlightShow Team Editor. This ebook covers what MVVM is and how to use it in practice, how to solve issues when applying this pattern and how to take advantage from it.

WPF MVVM Practical Data Application • Dot Net For All

What is MVVM and why you need it: Do you know the feeling, when you start to develop an application, and in the first couple of days you feel good because you made a really good progress? Do you know the feeling, when after a couple This ebook covers what MVVM is and how to use it in practice, how to solve issues when applying this pattern and how to take advantage from it. Do you know the feeling, when after a couple of days, you feel that your design is not that best and when you have to modify a little code, you are afraid of the effect it might have on other parts of you code?

The first sign of a bad design is when applying a hack is easier than to implement it the proper way. At the end of the week you already have spaghetti code.

You have logic that is not testable, it is very tightly coupled with the UI. If someone wants to understand your code, it takes days or weeks to figure out how it works.

This is where MVVM comes into play. Get A Copy. Kindle Edition , 48 pages. Published February 13th by SilverlightShow first published February 12th More Details Other Editions 1. Friend Reviews.

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Community Reviews. Showing Rating details. Sort order. But his coding examples are so convoluted that it makes it harder to follow if new to the framework, I found it easier to go to some of his website references and implement the ViewModel to understand what he was talking about.