How do you update an edmx file with database changes?

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I have an edmx file and I changed a table in my database. I know that there is an "Update Model from database" wizard, however in many cases this is useless.

For example if I change a field from non null to nullable or if I remove fields the update model does not reflect the changes. I have had to remove the entity and add it back in to get the changes to appear in my model.

Per the following question: How do I propagate database changes to my .edmx file?

One of the answers seems to say the same thing, that you need to remove the entity and add it back in.

Is this the definitive answer or is there a better way to do this?


An important first step is to understand exactly what happens when you use the update model wizard.

From the MSDN Library:

The ADO.NET Entity Data Model Designer (Entity Designer) uses the Update Model Wizard to update an .edmx file from changes made to the database. The Update Model Wizard overwrites the storage model as part of this process. The Update Model Wizard also makes some changes to the conceptual model and mappings, but it only makes these changes when objects are added to the database. For example, new entity types are added to the conceptual model when tables are added to the database, and new properties are added to entity types when columns are added to a table. For details about what changes are made to the .edmx file, see Changes Made to an .edmx File by the Update Model Wizard.

When you updated the database using the update model wizard, it updated the storage model in the .edmx file and not the conceptual model. When changes are made to the definition of existing objects, only the storage model is updated; the conceptual model is not updated. For a complete description of changes that are made by the update model wizard, please see the "Changes Made to an .edmx File by the Update Model Wizard" link above.

Here are some options on how to update objects that are not updated by the update model wizard (based on your scenario where a the column definition was altered):

  1. Use the update model wizard (to update the storage model), open the .edmx file using the designer (default), find the desired scalar property and edit the desired properties in the Properties windows.
  2. Use the update model wizard (to update the storage model), open the .edmx file using the XML editor, find the desired property in the CSDL (conceptual model) section and change the desired attributes. This is basically the same as option 1, but you're editing the XML directly (a find and replace might be useful here).
  3. From the Model Browser, delete the desired entity from the Entity Types section of the conceptual model and the desired table from the Tables / Views section of the storage model. Then use the update model wizard to add it back.

The best option would depend on the given scenario. For example, if you just altered the definition of one column, then option 1 is likely you best choice. If you altered the definition of a number of columns in a single table, then option 3 might be your best choice. If you altered a column that is used across a number of tables (such as a primary / foreign key), then editing the .edmx XML directly might be your best option.

[SOLVED], An important first step is to understand exactly what happens when you use the update model wizard. From the MSDN Library: The ADO. An important first step is to understand exactly what happens when you use the update model wizard. From the MSDN Library: The ADO.NET Entity Data Model Designer (Entity Designer) uses the Update Model Wizard to update an .edmx file from changes made to the database. The Update Model Wizard overwrites the storage model as part of this process.


How do you update an edmx file with database changes?, You must update the model to include your new column. In the Models folder, open the ContosoModel.edmx file to display the model diagram. Update the .edmx file when the Database changes In the Model Browser, right-click the .edmx file and select Update Model from Database. Expand the Tables, Views, and Stored Procedures nodes, and check the objects you want to add to the .edmx file.


If I understand your question and your example, once you do the update model from database step and you're sitting there on the Model.edmx diagram, you can highlight the property in the class that you want to change and show the properties on it, and change the Nullable property for it to Nullable: True. That's at least one way to do this.

I believe the idea here is that conceptual model (that isn't being changed from non-null to nullable) can actually differ from the underlying database table and so it doesn't change that part and that difference might be exactly what you intend. The two ways I handle this are either doing the remove & add as you mentioned or more typically I manually set the properties as I mentioned.

How to Update Edmx File when Database Changes ?, In this ASP.NET Tutorial we will learn, How to update Model(EDMX) from Database. Suppose Duration: 2:41 Posted: Jan 29, 2016 Use the update model wizard (to update the storage model), open the .edmx file using the XML editor, find the desired property in the CSDL (conceptual model) section and change the desired attributes. This is basically the same as option 1, but you're editing the XML directly (a find and replace might be useful here).


Consider I have added a new column(c1) to my existing table. Then to update the same in my existing Entity Model, I would do the following.

I will open the .edmx file in notepad ++.

I will add the property c1 to .edmx file where ever necessary. For example I would add c1 node below every c0 node.

    <EntityType Name="table">
      <Key>
        <PropertyRef Name="Id" />
      </Key>
      <Property Name="Id" Type="int" StoreGeneratedPattern="Identity" Nullable="false" />
      <Property Name="c0" Type="nvarchar(max)" />
      <Property Name="c1" Type="nvarchar(max)" />
    </EntityType> 

Reload the project in Visual studio.

And finally add the attribute c1 to the model.

Tutorial: Change the database for EF Database First with ASP.NET , Its very important to refresh Entity Framework because without refreshing, you cant access the Duration: 5:24 Posted: Jan 1, 2017 IN EF-4.0 [ADO.NET] When i use " Update Wizard" by right-click on EDMX ..,It making change on edmx when i delete some table in DB. But when i make changes to the columns in tables its not reflecting in the EDMX perfectly. So i started doing manually by modifying in EDMX xml file which contain ssdl, csdl etc..,.


  1. Firstly, double click .edmx file
  2. Secondly, Right Click on the Empty space and select "Update Model From Database"
  3. Thirdly, Select Refresh tab on the menu bar.
  4. Lastly, Select the table you want to refresh and select Finish..

Update Model From Database in Entity Framework, A simple change to one piece of code can require updates throughout. This is especially The model exists in your project as an .edmx file. Open the Solution​  Database First allows you to reverse engineer a model from an existing database. The model is stored in an EDMX file (.edmx extension) and can be viewed and edited in the Entity Framework Designer. The classes that you interact with in your application are automatically generated from the EDMX file.


Part 25- How to refresh Entity Framework after adding new table into , After updating the database and refreshing the models in edmx file through VS2017. It takes 1 hour or more to refresh the file and it's not  So anytime you find your EF model and/or class files out of sync with your database then you need to manually run the “Run Custom Tool” command on both the [Entities].tt file and the [Entities].Context.tt file. This is a big pain. I will ping the product team to see if they can run the custom tool on the EDMX file when it is saved and recursively run on all the tt files associated with that EDMX parent. Jon


Rebuilding the Model from the Database in Visual Studio, The biggest beef I have with it is that the models can get out of sync with the database and saving the EDMX file and running the “Update Model  Right-click anywhere on the design surface, and select Update Model from Database. In the Update Wizard, select the Refresh tab and then select Tables > dbo > Student. Click Finish. After the update process is finished, the database diagram includes the new MiddleName property. Save the ContosoModel.edmx file. You must save this file for the new property to be propagated to the Student.cs class. You have now updated the database and the model.


When updating edmx file to refresh the changes done on database , This could be a disadvantage when there is a large amount of existing code and you want only minor changes. In this case safer method can be manually changing the code in XML view of .edmx file. To add new table mapping, you need to add new entity to .edmx designer by right clicking on .edmx