Add an ObservableListSource class to the project:.To do this we are going to extend ObservableCollection to add IListSource functionality. The assembly is no longer used for Entity Framework 6 applications.Ĭollection properties must implement the IListSource interface to enable two-way data binding with sorting when using Windows Forms. If the project has a reference to, then it will be removed when the EntityFramework package is installed. In addition to the EntityFramework assembly a reference to is also added. In the Manage NuGet Packages dialog, Select the Online tab and choose the EntityFramework package.In Solution Explorer, right-click on the WinFormswithEFSample project.Install the Entity Framework NuGet package Select Windows in the left pane and Windows FormsApplication in the right pane.For more information, see Installing NuGet. If you are using Visual Studio 2010, you also have to install NuGet. You need to have Visual Studio 2013, Visual Studio 2012 or Visual Studio 2010 installed to complete this walkthrough. The screen shots and code listings in this walkthrough are taken from Visual Studio 2013 but you can complete this walkthrough with Visual Studio 2012 or Visual Studio 2010. The WinForms data-binding framework enables navigation between related objects: selecting rows in the master view causes the detail view to update with the corresponding child data. Then, the Visual Studio tools are used to bind the types defined in the model to the WinForms controls. The model defines two types that participate in one-to-many relationship: Category (principal\master) and Product (dependent\detail). The application uses Entity Framework to populate objects with data from the database, track changes, and persist data to the database. Please restore the packages if you are using this version.This step-by-step walkthrough shows how to bind POCO types to Window Forms (WinForms) controls in a “master-detail" form. The " Download source (Packages Excluded)" zipped file contains the light version of the demo where the packages are excluded. Before running the application, please change the connection string according to your system or server. However, there are commented codes which can be used to test the Code First convention and configuration for creating primary key. The attached source code contains the final version of the walk-through. The order of priorities for creating primary key using Entity Framework Code First is:Ĭonvention -> Data Annotation -> Fluent API (Highest Priority) Notes to Use the Attached Source Code Before creating the model, Code First takes convention into consideration first, then reads the data annotation attributes and finally reads the mappings specified by Fluent API. Fluent API has the highest priority among the three for creating the tables and columns. There are certain mappings which cannot be done using data annotation attribute but can be done by using Fluent API. The data annotation attributes are limited. But Fluent API method is preferable as it separates the mapping logic from the domain classes. There are three different ways to create primary key using Code First. (DatabaseGeneratedOption.None) Conclusion ModelBuilder.Entity().Property(s => s.Id).HasDatabaseGeneratedOption None: The database does not generate values. ![]()
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