Then, in the Individual components tab, locate "Entity Framework 6 tools" and ensure it is selected. In the Workloads tab, make sure that ".NET desktop development" and "ASP.NET and web development" are selected. Repair or reinstall Entity Framework: Open the Visual Studio Installer and select the "Modify" option for your Visual Studio installation. Then, right-click on the project, select "Add" > "New Item" > "Data" > "ADO.NET Entity Data Model" to add a new Entity Framework model to your project. Go to "Extensions" > "Manage Extensions" in Visual Studio and disable any extensions that might be causing conflicts.Ĭlean and rebuild the solution: Go to the "Build" menu in Visual Studio and select "Clean Solution." Once the cleaning process is complete, select "Rebuild Solution." This will ensure that all project files are rebuilt and any cached template files are regenerated.ĭelete the Entity Framework template files: In your project, locate the Model.tt file and its associated. Make sure the connection string includes the correct provider, server, database name, and authentication details.ĭisable third-party extensions: Temporarily disable any third-party extensions that might interfere with the Entity Framework template generation process. This error can occur for various reasons, here are a few suggestions to troubleshoot and resolve the issue:Ĭheck the connection string: Ensure that the connection string in your application's configuration file (Web.config or App.config) is correctly configured to point to the localdb SQL Server file (School.mdf). The error you're experiencing seems to be related to the Entity Framework's code generation process for the ADO. DynamicTextTransformation.get_GenerationEnvironment()Īt .EntityFrameworkTemplateFileManager.ctor(Object textTransformation)Īt .(Object textTemplating)Īt .EntityFrameworkTemplateFileManager.Create(Object textTransformation) Microsoft Visual Studio Enterprise 2022 (64 位元) - Current Please help and thanks in advance! The environment and error code are as following: I even re-installed my Windows but with no luck. This process worked before and for some reasons it keeps generating the same error.
I've not put any code into the the project yet and re-installed Visual Studio a couple of times and the error still exists. Net Entity Data Model into the Model folder and always received the System.NullReferenceException error. I then added a table(Student) with only two attributes for testing.
I created a localdb sql server file(School.mdf) in the App_Data folder in an MVC project using.
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