I'm using Entity Framework 6 and "model first" in my solution, I separated my "Data Model" classes into another project, so that I can add reference to the "Data Model" classes without exposing my "Data Model Contexts" and connections. I don't want to expose my Entity Data Model project (especially the DB Context etc) to my UI Layer. I have this:
I have now successfully separated my auto generated entity classes from my data model, I tried it this works by adding an entity or a property to an entity is updated in the project Mapeo.BusinessEntity.
This is my connection string from DatabaseLayer (Mapeo.DatabaseModel)
<connectionStrings>
<add name="MapeoModelContainer" connectionString="metadata=res://*/MapeoModel.csdl|res://*/MapeoModel.ssdl|res://*/MapeoModel.msl;provider=System.Data.SqlClient;provider connection string="data source=raranibar\ral;initial catalog=Mapeo;user id=sa;password=*****;MultipleActiveResultSets=True;App=EntityFramework"" providerName="System.Data.EntityClient" />
</connectionStrings>
In my service layer I it copied this connection string to the App.config, my problem is this when I want to add a data I have this message: Unable to load the specified metadata resource How I can resolve this problem?
Updated I found the solution, I changed the connectionstring in App.Config the pretentation layer I replaced in the connection strign "*" for the directory of DataModel in my case (Mapeo.DatabaseModel) this is now my connection string in layer presentation:
<connectionStrings>
<add name="MapeoModelContainer" connectionString="metadata=res://Mapeo.DatabaseModel/MapeoModel.csdl|res://Mapeo.DatabaseModel/MapeoModel.ssdl|res://Mapeo.DatabaseModel/MapeoModel.msl;provider=System.Data.SqlClient;provider connection string="data source=raranibar\ral;initial catalog=Mapeo;user id=sa;password=scugua;MultipleActiveResultSets=True;App=EntityFramework"" providerName="System.Data.EntityClient" />
</connectionStrings>
Update your connectionString with correct path if you've such like issue to load metadata files. May it help someone else...
connectionString="metadata=res://DatabaseModel/MyModel...
After creating the entity if the database edit, entity does not work
As long as the entity update
In this way:
If this method did not work
It is better to do:
- Remove this tag:
<add name="MapeoModelContainer" ... - Remove MapeoModel.edmx
- Add ADO.NET Entity Data Model
Then use the wizard to create a connection and entity
If this method did not work either send
Inner exception
来源：https://stackoverflow.com/questions/25514844/entity-framework-6-error-unable-to-load-the-specified-metadata-resource