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This post describes the fix to THE “No Entity Framework provider found for the ADO.NET provider with invariant name ‘System.Data.SqlClient’” error, which Visual Studio throws at your face when you try to run an application on any Windows-based system (or which you’ve dug out of event logs). Also, your application is probably built on .NET Framework and Entity Framework. Let’s get into it! Error When debugging/running your code, somewhere in your…Continue reading Fixing the “No Entity Framework provider found for the ADO.NET provider with invariant name ‘System.Data.SqlClient’” error
This post describes how to run Entity Framework’s code-first migrations against a database located in Windows Azure. This is done by running the Update-Database commandlet with suitable switches, see below. The problem and symptoms Okay, so you’re developing your MVC+EF cool web app with a database in Azure, and you’re using code-first migrations. Cool! What’s nice with code-first-migrations is the fact they are run automatically even in the cloud the…Continue reading Applying Entity Framework’s Code-First Migrations against a Database in Azure by running Update-Database
This post describes one of the more no-brainerish ways of fixing a ‘System.OutOfMemoryException’ exception being thrown in your ASP.Net MVC application using C# and Entity Framework. Problem While developing a web project, for example, an ASP.NET MVC web application that is using EF, sometimes when handling a lot of data or complex entities on your dev machine, you encounter this error: This of course blocks you from debugging or even…Continue reading Exception of type ‘System.OutOfMemoryException’ was thrown.
While using Entity Framework and code-first migrations, Entity Framework (EF) creates the indexes for you – but what if you need to create a custom one, explicitly based on a certain field/column? Then you’ll have to tell EF which one to use as a key column. Usually, it’s easy – you just add the following annotation to the columns you’ll be using: [Index(“OfficialIds”, 1)] public int AreaId { get; set; } [Index(“OfficialIds”, 2)] public string EstateId { get; set; } (example stripped of extra…Continue reading Fixing the error: “Column XX in table dbo.YY is of a type that is invalid for use as a key column in an index.”
This post describes an issue with EF’s code-first migrations, when mapping between DB’s DateTime (datetime2) and C#’s DateTime simply fails, and results in the Update-Database cmdlet failing, too. It is more or less a prime example of a situation, where the error itself tells very little about the actual issue, and since debugging code-first migrations is kind of difficult (see the best tips for that here!), it’s cumbersome to investigate.…Continue reading Fixing “An error occurred while updating the entries” while running code-first migrations in MVC 5 app
