Tag: EF

Not sure if a bug or a feature

Help! My ASP.NET MVC textbox date format is wrong!

Have you ever been struggling, to make your ASP.NET MVC views format your properties of type datetime correctly? I have. And I’ve been shot in the leg by weird hacks made by both me (just 6 months earlier) or someone else. So I thought I’d finally document the different ways one can set up the formatting of datetime fields in ASP.NET MVC projects. Or at least all the ways I’ve found so far! :) While this guide has been written for ASP.NET MVC, most of […]

No Entity Framework provider found for the ADO.NET provider with invariant name 'System.Data.SqlClient'

Fixing error “No Entity Framework provider found for the ADO.NET provider with invariant name ‘System.Data.SqlClient'”

This post describes the fix to error “No Entity Framework provider found for the ADO.NET provider with invariant name ‘System.Data.SqlClient’“, 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 you get an error like this: An exception of type ‘System.InvalidOperationException’ occurred in EntityFramework.dll but was not handled in […]

Applying Entity Framework’s Code-First Migrations against a Database in Azure by running Update-Database

This post describes how to run Entity Framework’s code-first migrations against a database located in the Windows Azure. This is done by running 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 next time your app is running (as long as you publish your app with that […]

Spatial SQL types

Solving the “Spatial types and functions are not available …” -problem

This page describes mutiple ways on how to fix the exception ‘Spatial types and functions are not available for this provider because the assembly ‘Microsoft.SqlServer.Types’ version 10 or higher could not be found.‘ which comes up during debugging or publishing your program, app or service using DbGeography. Symptoms While running a console program or perhaps installing an ASP.NET MVC website on a machine, where SQL Server (apart from the one that comes with the Visual Studio) has not been installed, you may encounter the following error: […]

entity-framework-logo

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.”

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 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 code and other columns for clarity) And after adding the migration (Add-Migration… commandlet) you get […]

Entity Framework's Update-Database throwing an error

Fixing “An error occurred while updating the entries” while running code-first migrations in MVC 5 app

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’s 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. Symptoms So what’s the error that we’re running into, exactly? Below, you can find the most […]