What is ria services

It says what it can achieve but does not say why I need it. You can create a RIA client that is aware of business rules and know that the client is automatically updated with latest middle tier logic every time that the solution is re-compiled. So what is it? Or is it a technology on top of WCF or underneath it or what? Where does it live? With data, with server, what? RIA services is a server-side technology that automatically generates client-side Silverlight objects that take care of the communication with the server for you and provide client-side validation.

The key thing to remember in RIA services is that it's mainly a sophisticated build trick. When you create a domain service and compile your solution, a client-side representation of your domain service is generated. This client-side representation has the same interface.

When you build your solution, a class is generated inside your Silverlight project called CustomerContext that has a method GetCustomersByCountryQuery. You can now use this method on the client as if you were calling it on the server.

Updates, inserts and deletes follow a different pattern. When you create a domain service, you can indicate whether you want to enable editing. However, the client-side part doesn't have these methods. What you have on your CustomerContext is a method called SubmitChanges.

So how does this work:. As for validation, you can decorate your server-side objects with validation attributes from the System. DataAnnotations namespace. Again, when you build your project, validation code is now automatically generated for the corresponding client-side objects. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Along with extensive printing support, it includes support for elevated permissions, webcams, microphones, toast, clipboard access and more.

One concern with line-of-business Silverlight applications is connecting to data. Nothing prevents you from creating your own Windows Communication Foundation WCF service and connecting to it in Silverlight 3, but that leaves a lot to be desired, especially when you consider the myriad ways you can connect to data from ASP. NET or desktop applications. Crossing this chasm may seem deceptively simple at first.

Obviously, it has been done to some degree in a number of existing data-rich Silverlight applications. But what initially appears to be an easy task becomes increasingly complicated as you address more concerns. How do you track changes over the wire or encapsulate business logic in entities that live on both sides of the firewall? How do you keep the details of transmission from leaking into your business concerns?

Third-party tools are emerging to address these concerns, but Microsoft also saw it needed to provide a solution, so it introduced WCF RIA Services formerly. NET Framework 4 support or lack thereof with Azure. In the interim, KharaPOS provides a good example of using the. NET Framework 4 to create a real-world application. You can visit the site to download the code, view documentation and join the discussion surrounding development of the application.

A number of excellent books discuss design patterns for enterprise application development. This book and its supplemental Web site martinfowler. Understanding these will give a clearer picture of how RIA Services can be adapted to meet the needs of the simplest to the most complex business applications. The first three concern different ways of dealing with the logic surrounding your data. As you progress through them, the logic moves from being scattered throughout the application and repeated as needed to being centralized and focused.

The forms-and-controls pattern or as I refer to it, forms over data places all of the logic within the UI. At first glance, this seems like a bad idea. While many developers relegate the forms-over-data approach to initial prototyping only, there are definite uses for it in final applications. You now have a simple data grid that can be used to directly edit existing rows in your table. With a few more additions, you can create a form that lets you add new rows to the table.

Also, as mentioned, this is a valid pattern within RIA Services-based applications. Recommendation As with ASP. NET dynamic data, the forms-over-data pattern should be used for simple administration UIs such as the KharaPOS product category editor , where the logic is simple and straightforward: add, remove and edit rows within a lookup table.

Table Data Gateway The standard, out-of-the box approach to RIA Services applications I just discussed can also be viewed as an implementation of the table data gateway pattern as presented on pp. But if you squint, it closely resembles the table data gateway pattern.

To be honest, it would have been a more logical progression to discuss the mapping between the RIA Services and the table data gateway pattern, because all the remaining patterns in the list are data interface patterns, but forms over data is mostly a UI pattern. However, I felt it more prudent to start with the basic scenario and focus on the UI moving back toward the database. Figure 2 , the XAML for category management, illustrates this.

The column for the parent category in the data grid is a combobox that uses a list of the existing categories so users can select the parent category by name instead of memorizing the ID of the category. Therefore, I had to declare two domain data sources: one for the grid and one for the lookup combobox.

Also, the code-behind for managing categories is rather convoluted see Figure 3. As you see, the ViewModel is responsible for initializing the domain context and informing the UI when a load is occurring, along with handling the requests from the UI to create new categories, save changes to existing categories and reload the data from the domain service.

This leaves a clean separation between the UI and the logic that drives it. The MVVM pattern may appear to require more work, but its beauty reveals itself the first time you have to change the logic for getting data into the UI.

Also, moving the process of loading the categories into the ViewModel allows us to clean up the view significantly XAML and code-behind alike. As you begin adding logic to your application, the forms-over-data pattern becomes cumbersome. Another side effect of decentralized logic is that developers may not be aware that specific functionality already exists in the application, which can lead to duplication.

Measure ad performance. Select basic ads. Create a personalised ads profile. Select personalised ads. Apply market research to generate audience insights.

Measure content performance. Develop and improve products. List of Partners vendors. Your Money. Personal Finance. Your Practice. Popular Courses.

Investopedia Financial Advisor. Part Of. Wealth Management Industry. Types of Financial Advisors. Working with a Financial Advisor. Advisor Issues. What Is a Registered Investment Advisor? Key Takeaways Registered investment advisors RIAs manage the assets of high-net-worth individuals and institutional investors. RIAs can create portfolios with individual stocks, bonds, and mutual funds; they may use a mix of funds and individual issues or only funds to streamline asset allocation and cut down on commission costs.

An RIA usually generates revenue through a management fee, which is made up of a percentage of assets held for a client—fees of 0. Article Sources. Investopedia requires writers to use primary sources to support their work.

These include white papers, government data, original reporting, and interviews with industry experts. We also reference original research from other reputable publishers where appropriate. You can learn more about the standards we follow in producing accurate, unbiased content in our editorial policy. Compare Accounts.

The offers that appear in this table are from partnerships from which Investopedia receives compensation. This compensation may impact how and where listings appear.