edmx-designer | 易学教程

I can't update my edmx since the Entity Data Model Designer is unable to open it

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问题 Hi everyone and thanks for taking the time to see my question. I'm running VS 2017 with Entity Framework 6 and asp.net MVC and have to add some field to one of my Entities. I added the corresponding fields in the database, but when I open the edmx file nothing shows apart the message "Entity Data Model Designer is unable to open this file." and it proposes me to open it in XML editor, but I have not the "Update model from Database" option when right clicking on the XML file. Is anyone knows

What's “Entity key” in edmx file?

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问题 in a C# project, using EF Database first I've added a foreign key to a table using SQL server management studio. After that, back to Visual Studio I've updated the model from the database but I couldn't see the "link" (i.e. the line joining the two tables in the .edmx diagram) between the two affected tables. So in the dropdown over the child table I saw this option "Entity key" and when I clicked it the "link" appeared. To be honest, I don't know and I can't understand what it does, cause I

Visual Studio 2013 and Entity Framework 4

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问题 I'm working on an older project that uses Entity Framework 4 in Visual Studio 2013. When going to "Update Model from Database" it only gives me EF 5 or EF 6 to choose from when updating the database. This installs EF 5 in my project and upgrades it from EF4 to EF5. I attempted converting the project to EF5, but entity framework has a bug where classes in different name spaces cannot have the same class name in the entity model. This would require a WHOLE LOT of changes. Reading about EF 6,

I can't update my edmx since the Entity Data Model Designer is unable to open it

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Does EF7 support EDMX approach?.How to use EF7 to execute stored procedure?

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问题 Does EF7 support EDMX approach?.How to use EF7 to execute stored procedure?. Any suggestion is appreciable. 回答1: There is no EDMX support, but Database First Will Continue.Here you can find out more. EF 7 will support multiple result sets in the future, but at this stage there is no support for them. You can track the Stored procedure support on this GIT issue. Hope this helps to you. 回答2: EF Core, does not support EDMX, nor its preceding EF 6.x In the other hand, it already supports stored

Can Entity Framework 4.1 designer “update model from database” for selected entities only?

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问题 The situation: Sometimes a database schema is not what you would consider an ideal representation of the system's information and you may not be able to change it. We have been using Entity Framework to create a nicer conceptual model to code against in situations like this. This means updating the model from the database and then changing it ourselves, either through the designer or through the .edmx file directly using a text editor. The problem: When you update the model from the database,

How to enable cascading delete in Edmx Designer on many to many relation

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问题 I am using VS2012 and the Entity designer to generate both the database and the models. I have a very basic scenario of Table1 to Table1and2JoinTable to Table2. Something like Students, Classes, StudentClasses. You can have many students in many classes. I would like to have a cascading delete. So if you delete a student any rows in the StudentClass join table are deleted for that student id. Same for deleting a class any rows in the StudentClass are deleted for that class id. After setting

How to integrate my own structural annotations engine in the Entity Framework designer?

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问题 In the accepted answer to this SO question there is an explanation about structural annotations , a way to customize the data on the EDMX files generated by the Entity Framework designer. This feature is used by the Portable Extensible Metadata framework in order to add validation information to the entities defined in an EF model, by adding extra entries to the "Properties" window of the created entities and its properties. My question is: what should I do if I want to create my own custom

How to integrate my own structural annotations engine in the Entity Framework designer?

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In the accepted answer to this SO question there is an explanation about structural annotations , a way to customize the data on the EDMX files generated by the Entity Framework designer. This feature is used by the Portable Extensible Metadata framework in order to add validation information to the entities defined in an EF model, by adding extra entries to the "Properties" window of the created entities and its properties. My question is: what should I do if I want to create my own custom structural annotations engine? That is, I want Visual Studio to show some extra entries in the

does Visual Studio 2015 include .edmx support?

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问题 Does Visual Studio 2015 include .edmx support? I have a project that includes an .edmx data model and double-clicking it in VS2015 just opens the XML editor. There's no DbContext generator option in the file->new dialog. 回答1: During setup of VS2015, go to the advanced options and select Web or Database Development tools. Now the Installers install the EF tools (Designer + templates). If you have VS already installed, to the Programs & features in control panel and modify the currently