designer window microsoft visual studio 2017

The following illustration shows the designer after the Northwind Customers and Orders tables have been dragged from Server Explorer. dbml file, Visual Studio shows the O/R Designer surface that enables you to visually create the model. This is the XML mapping file and its related code files. To add a LINQ to SQL entity model to your project, choose Project > Add New Item, and then select LINQ to SQL Classes from the list of project items: Finally, the O/R Designer provides the ability to design inheritance relationships between entity classes. The O/R Designer also provides functionality to map stored procedures and functions to DataContext methods for returning data and populating entity classes. It also generates a strongly-typed DataContext that sends and receives data between the entity classes and the database. In other words, the O/R Designer creates an object model in an application that maps to objects in a database. The O/R Designer provides a visual design surface for creating LINQ to SQL entity classes and associations (relationships) that are based on objects in a database. The methods pane is the design surface that displays the DataContext methods that are mapped to stored procedures and functions. The entities pane is the main design surface that displays the entity classes, associations, and inheritance hierarchies. The O/R Designer has two distinct areas on its design surface: the entities pane on the left, and the methods pane on the right. To install the LINQ to SQL tools, start the Visual Studio installer, choose Modify, then select the Individual Components tab, and then select LINQ to SQL tools under the Code Tools category.

dbml files with a designer surface requires the LINQ to SQL tools which are not installed by default as part of any of the workloads of Visual Studio. In Visual Studio, you create LINQ to SQL classes that represent SQL tables by using the Object Relational Designer ( O/R Designer).

In general, new applications should use the Entity Framework when an object-relational mapper layer is required. Use LINQ to SQL when maintaining a legacy application that's already using it, or in simple applications that use SQL Server and do not require multi-table mapping. It works well in basic scenarios and continues to be supported in Visual Studio, but it's no longer under active development. LINQ to SQL was the first object-relational mapping technology released by Microsoft. Applies to: Visual Studio Visual Studio for Mac Visual Studio Code

Designer window microsoft visual studio 2017