Entity Framework Tutorial Basics（41）：Multiple Diagrams

Multiple Diagrams in Entity Framework 5.0

Visual Studio 2012 provides a facility to split the design time visual representation of the Entity Data Model. This means that you can have multiple diagrams for one Entity Data Model.

You can create a new diagram in multiple ways:

  1. Add a new diagram and drag and drop entities from Model Browser
  2. Move entities from an existing diagram to a new diagram

1. Add a new diagram and drag and drop entities from Model Browser:

You can add a new diagram by right clicking on the Diagrams node of the model browser and selecting ‘Add New Diagram‘:

You can rename the diagram, for example: StudentDiagram to include all student related entities:

Now, you can drag and drop Student and StudentAddress entities to this new diagram:

2. Move entities from existing diagram to new diagram:

You can also move entities from an existing diagram to a new diagram. For example, if you want to move Teacher and Course entities to a new diagram, then select those entities in an existing diagram and right click and select ‘Move to New Diagram‘ from the context menu:

It will create a new diagram and move Teacher and Course entities to a new diagram as shown below:

So, in this way you can create a new diagram from an existing diagram.

You can also include the related entities of a particular entity. For example, right click on Student entity → select ‘Include Related‘. Standard and Course entities will also be included, because Student has their reference property:

This will include Standard and Course entity as shown below.

Additionally, you can also move properties up or down by right clicking on the property → select Move Property → select UP/Down etc. as shown below:

Difference between delete and remove entity:

You can remove the entity from the diagram by right clicking on entity and selecting ‘Remove from diagram‘.

Remove from Diagram will only remove the entity from the diagram whereas ‘Delete from Model‘ will delete the entity from the EDM. So you won‘t be able to use that entity at all.

时间： 2024-10-06 09:04:26

Entity Framework Tutorial Basics（41）：Multiple Diagrams的相关文章

Entity Framework Tutorial Basics（1）：Introduction

以下系列文章为Entity Framework Turial Basics系列 http://www.entityframeworktutorial.net/EntityFramework5/entity-framework5-introduction.aspx ----------------------------------------------------------------------------------------------------------------------

Entity Framework Tutorial Basics（4）：Setup Entity Framework Environment

Setup Entity Framework Environment: Entity Framework 5.0 API was distributed in two places, in NuGet package and in .NET framework. The .NET framework 4.0/4.5 included EF core API, whereas EntityFramework.dll via NuGet package included EF 5.0 specifi

Entity Framework Tutorial Basics（2）：What is Entity Framework?

What is Entity Framework? Writing and managing ADO.Net code for data access is a tedious and monotonous job. Microsoft has provided an O/RM framework called "Entity Framework" to automate database related activities for your application. Microso

Entity Framework Tutorial Basics（3）：Entity Framework Architecture

Entity Framework Architecture The following figure shows the overall architecture of the Entity Framework. Let us now look at the components of the architecture individually: EDM (Entity Data Model): EDM consists of three main parts - Conceptual mode

Entity Framework Tutorial Basics（37）：Lazy Loading

Lazy Loading: One of the important functions of Entity Framework is lazy loading. Lazy loading means delaying the loading of related data, until you specifically request for it. For example, Student class contains StudentAddress as a complex property

Entity Framework Tutorial Basics（36）：Eager Loading

Eager Loading: Eager loading is the process whereby a query for one type of entity also loads related entities as part of the query. Eager loading is achieved using the Include() method. In the following example, it gets all the students from the dat

Entity Framework Tutorial Basics（42）：Colored Entity

Colored Entity in Entity Framework 5.0 You can change the color of an entity in the designer so that it would be easy to see related groups of entities in the designer from Visual Studio 2012 onwards. To change the color of an entity, select entity i

Entity Framework Tutorial Basics（34）：Table-Valued Function

Table-Valued Function in Entity Framework 5.0 Entity Framework 5.0 supports Table-valued functions of SQL Server. Table-valued functions are similar to stored procedure with one key difference: the result of TVF is composable which means that it can

Entity Framework Tutorial Basics（43）：Download Sample Project

Download Sample Project: Download sample project for basic Entity Framework tutorials. Sample project includes SchoolDB.mdf for SQL Server 2012. It also includes SchoolDB.sql script if you are using a different version of SQL Server.