Preview of useful design-time features for DbContext.
When right-clicking on a C# project, the following context menu function is supported:
1) Reverse Engineer Code First - Generates POCO classes, derived DbContext and Code First mapping for an existing database.
I was able to resolve the issue above by customizing the t4 templates. You can determine if the FK is set to cascade via navProperty.ToEndMember.DeleteBehavior == System.Data.Metadata.Edm.OperationAction.Cascade
Unfortunately, doesn't seem to be working on Visual Studio 2012. I tried using the "View Entity Data Model (Read-Only)" option (as well as other options in the same menu). It's giving me a "Sequence contains no matching element" error. This happens even for a very simple context with a simple entity.
Is there any place where I can get a stack trace or more details?
Got this error when attempting to update to the latest release. Any solutions?
02/07/13 16:31:28 - Install Error : VSIXInstaller.SignatureMismatchException: The signature on the update version of 'Entity Framework Power Tools Beta 2' does not match the signature on the installed version. Therefore, Extension Manager cannot install the update. at VSIXInstaller.Common.VerifyMatchingExtensionSignatures(IInstalledExtension installedExtension, IInstallableExtension updateExtension) at VSIXInstaller.InstallProgressPage.BeginInstallVSIX(SupportedVSSKU targetAppID)
I can't get it Reverse Engineer a SQL Compact database. The database I am trying to open is db.sdf.
System.ArgumentException: The modelEntityContainerName parameter 'D:\dbsdfContext' contains characters that are not valid. at System.Data.Entity.Design.EntityModelSchemaGenerator.Initialize(EntityContainer storeEntityContainer, IEnumerable`1 storeFunctions, String namespaceName, String modelEntityContainerName) at System.Data.Entity.Design.EntityModelSchemaGenerator..ctor(EntityContainer storeEntityContainer, String namespaceName, String modelEntityContainerName) at Microsoft.DbContextPackage.Handlers.ReverseEngineerCodeFirstHandler.ReverseEngineerCodeFirst(Project project)
Unable to view entity data in any format from 'Entity Framework' submenu in Solution Explorer. Exception thrown in dialog box: "Exception has been thrown by the target of an invocation" when I attempt.
Reverse Engineering DB works, however. Great feature!
This was working excellently for me but recently I have been getting the error below when doing a reverse engineer. I have been pulling my hair out trying to work out what's going wrong. The same solution works on my coworkers machines when doing the same thing so it must be something wrong on my Visual Studio.
One or more errors occurred while processing template 'Entity.tt'. CodeTemplates\ReverseEngineerCodeFirst\Entity.tt(2,4) : error : There was an error loading the include file 'EF.Utility.CS.ttinclude'. The transformation will not be run. The following Exception was thrown: System.NullReferenceException: Object reference not set to an instance of an object. at Microsoft.DbContextPackage.Utilities.EfTextTemplateHost.Microsoft.VisualStudio.TextTemplating.ITextTemplatingEngineHost.LoadIncludeText(String requestFileName, String& content, String& location) at Microsoft.VisualStudio.TextTemplating.Engine.ProcessIncludeDirective(Directive directive, ITextTemplatingEngineHost host)
I'm having trouble reverse enginering a database named [133.0040] (without the brackets) resulting in:
System.ArgumentException: The modelEntityContainerName parameter '1330040Context' contains characters that are not valid. at System.Data.Entity.Design.EntityModelSchemaGenerator.Initialize(EntityContainer storeEntityContainer, IEnumerable`1
storeFunctions, String namespaceName, String modelEntityContainerName) at System.Data.Entity.Design.EntityModelSchemaGenerator..ctor(EntityContainer storeEntityContainer, String namespaceName,
String modelEntityContainerName) at Microsoft.DbContextPackage.Handlers.ReverseEngineerCodeFirstHandler.ReverseEngineerCodeFirst(Project project)
Please advise (renaming the database is not an option).
Hello! When I try to execute this action *Right-click on the CodeFirstExistingDatabaseSample project in Solution Explorer *Select Entity Framework -> Reverse Engineer Code First
from http://msdn.microsoft.com/en-us/data/jj200620 lesson I see this message in Output window: One or more errors occurred while processing template 'Entity.tt'. C:\Program Files (x86)\Microsoft Visual Studio 11.0\Common7\IDE\Extensions\Microsoft\Entity Framework Tools\Templates\Includes\EF.Utility.CS.ttinclude(1,4) : error : A processor named 'T4VSHost' could not be found for the directive named 'CleanupBehavior'. The transformation will not be run. The following Exception was thrown: System.InvalidOperationException: Cannot find processor for directive 'T4VSHost'. at Microsoft.DbContextPackage.Utilities.EfTextTemplateHost.Microsoft.VisualStudio.TextTemplating.ITextTemplatingEngineHost.ResolveDirectiveProcessor(String processorName) at Microsoft.VisualStudio.TextTemplating.Engine.ProcessCustomDirectives(ITextTemplatingEngineHost host, TemplateProcessingSession session, IEnumerable`1 directivesToBeProcessed)
Good in theory, they need to fix their release process. It's been several weeks since the tools became inoperative with VS2012 and nobody has bothered releasing an update. How are you supposed to depend on the tools in a commercial environment with such response times? Luckily James Manning has a work-around (that works for us) but as a MSFT EF product, this should have been fixed on the order of hours, not weeks (and it's a simple fix too!).
HI Guys, tried using against latest MySql.Entities available through NuGet but fails on the Mapping.tt file.
To resolve issue I produced the tt. CodeTemplates from the content menu (right click) then commented out the sections in the mapping.tt file for the FixedLength & MaxLength checking. For some reason on MySql these pieces of information are missing in the properties retrieved from when the database schema is read. If these following properties could be populated then the tool would work fine for MySQL as well, as it is, i can at least generate all the entities as it is then just go through and apply the StringLength value (or MaxLength) to the relevant fields which is most string (varchar) fields :)
var fixedLengthFacet = (Facet)prop.TypeUsage.Facets.SingleOrDefault(f => f.Name == "FixedLength"); var maxLengthFacet = (Facet)prop.TypeUsage.Facets.SingleOrDefault(f => f.Name == "MaxLength");
Great tool, couple bugs and suggestions to report (albeit fairly minor). I'm using version 0.6.0.0. 1.Bug- Reverse engineering fails if 'save password' not checked on database connection dialog. 2.Suggestion- Can you store the most recently used server names in the drop drop down of the database connection dialog? 3.Suggestion- When reverse engineering is in progress, there is no UI indication that work is occurring and behaves as if it is frozen (VS 2012). 4.Bug/Suggestion. When you right click on the project to get the Entity Framework menu, accidentally clicking on 'Customize Reverse Engineering Templates' overwrites any existing customized templates with no confirmation dialog box. If the templates already exist in your project, you should at least get a warning that they will be overwritten. 5. Suggestion- Any way to change the output directories for the generated code?
I love using this tool, just hope it gets continued attention and refinement.
I was able to add support for WCF Soap serialization in the Entity.tt file by adding 'using System.Runtime.Serialization' and attributes [DataContract(IsReference=true)] for each class and [DataMember] for each property. This is the only practical way that I have found to automatically add WCF Soap Serialization support to EF5 entities. Waiting anxiously for new features that will allow for stored procedure support and for picking and choosing the objects for the model, like in the database first scenario. Thanks for this tool.
For those not wanting to install it, Rowan Miller posted a workaround for the 'T4VSHost' error on the EF blog until a new signed version of the Power tools is published: http://visualstudiogallery.msdn.microsoft.com/72a60b14-1581-4b9b-89f2-846072eff19d
I quote: "As a workaround to this issue you can edit Program Files (x86)\Microsoft Visual Studio 11.0\Common7\IDE\Extensions\Microsoft\Entity Framework Tools\Templates\Includes\EF.Utility.CS.ttinclude and remove the first line (<#@ CleanupBehavior Processor="T4VSHost" CleanupAfterProcessingTemplate="true" #>).
The only side effect of doing this is that the EF Designer will use more virtual memory when you create and edit models. On most computers this isn't a problem."
By the way, thanks to the EF team for this very useful extension!