![visual studio winforms remove empty handlers visual studio winforms remove empty handlers](https://docs.devexpress.com/WindowsForms/images/windowsinspiredui-manual-select-skin124502.png)
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A single EntityDataSource provides access to all tables and views in the model, and saving changes only takes a call to the SaveChanges method. These data sources are then exposed to designers using an IListSource implementation.Īfter that, you can add controls to the form and bind them to the EntityDataSource using their DataSource, DataMember, or Binding properties as usual. When you do that, the EntityDataSource component instantiates an object context and uses Reflection to find all data sources available in the context. Once the data model has been created, you can drag an EntityDataSource component onto the form and set its ObjectContextType property to the type of ObjectContext represented by the Entity Data Model (note: if you are using the EF6 version of the project, use the DbContextType property instead of ObjectContextType). To use it, you start by creating an Entity Data Model (this is the first step in any ADO.NET Entity Framework project, and is analogous to creating the DataSet class in traditional ADO.NET programming). The EntityDataSource component plays the role of a DataSet and BindingSource in traditional ADO.NET programming.
#Visual studio winforms remove empty handlers full#
EntityDataSource: A component that encapsulates an entity data model and exposes its elements as data sources suitable for binding, with full design-time support.That is the goal of the EFWinForms library presented here.
![visual studio winforms remove empty handlers visual studio winforms remove empty handlers](https://docs.oracle.com/cd/E15357_01/coh.360/e15726/img/coherence01.png)
The good news is this support can be added with relatively little work, and the result can be encapsulated into a reusable component that enables rich binding scenarios for WinForms applications.
#Visual studio winforms remove empty handlers code#
A little code is enough to get really basic bindings to work, but substantial work is required to get the full-fledged binding experience you are probably used to (including automatic sorting, filtering, and hierarchical binding, for example). Even simple binding scenarios require code. The bad news is this rich design time support is not applicable to Entity Framework data sources.
![visual studio winforms remove empty handlers visual studio winforms remove empty handlers](https://www.gnostice.com/images/newsletter/2013-12-PN-SCREENSHOT-VS-WebViewer-WebConfig.png)
If you have used the traditional ADO.NET data classes, you are familiar with the Visual Studio tools used for creating DataSet classes, and binding controls to those classes at design time, by using their DataSource, DataMember, or Binding properties. This is unfortunate since WinForms is still the platform of choice for many data-oriented business applications, and data binding is an essential part of WinForms development. Although all the great features of the Entity Framework can be used in WinForms applications, there is little support for data binding. Instead, we will focus on using the ADO.NET Entity Framework in WinForms applications. A few of those are listed in the References section at the end of this document. That is a deep subject, and well covered in many excellent articles and books. We will not discuss the technical details of the ADO.NET Entity Framework. The data access layer code that is automatically generated by Visual Studio is easier to maintain, extend, and re-use.Data is retrieved automatically whenever you request it, and saving the changes only requires a call to the SaveChanges method.
![visual studio winforms remove empty handlers visual studio winforms remove empty handlers](https://global-cdn.grapecity.com/en/pages/componentone/input-winforms-opt/header-input-winforms.png)
The result is code that is much cleaner and more intuitive. Instead of working with classes that derive from DataTable and DataRow (e.g., CustomerDataTable, CustomerDataRow), you work with the actual objects (e.g., Customer).If you are used to the traditional ADO.NET data classes ( DataSet, DataAdapter, etc.), then you will probably find that working with the ADO.NET Entity Framework makes many things much simpler: It also includes a layer that bridges the conceptual models to the actual data store, so you can easily transfer data between the conceptual model and a backing database. It allows you to create conceptual data models that are easy to program against. The ADO.NET Entity Framework is Microsoft's latest data technology.
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