Entity-framework – Unable to generate an explicit migration in entity framework

entity-frameworkentity-framework-migrations

I am adding a new migration but this message shows:

Unable to generate an explicit migration because the following
explicit migrations are pending: [201203170856167_left]. Apply the
pending explicit migrations before attempting to generate a new
explicit migration.

Can any one help me?

Best Answer

It tells you that there is some unprocessed migration in your application and it requires running Update-Database before you can add another migration.

Related Solutions

.net – Entity Framework vs LINQ to SQL

LINQ to SQL only supports 1 to 1 mapping of database tables, views, sprocs and functions available in Microsoft SQL Server. It's a great API to use for quick data access construction to relatively well designed SQL Server databases. LINQ2SQL was first released with C# 3.0 and .Net Framework 3.5.

LINQ to Entities (ADO.Net Entity Framework) is an ORM (Object Relational Mapper) API which allows for a broad definition of object domain models and their relationships to many different ADO.Net data providers. As such, you can mix and match a number of different database vendors, application servers or protocols to design an aggregated mash-up of objects which are constructed from a variety of tables, sources, services, etc. ADO.Net Framework was released with the .Net Framework 3.5 SP1.

This is a good introductory article on MSDN: Introducing LINQ to Relational Data

Entity-framework – Reset Entity-Framework Migrations

You need to :

Delete the state: Delete the migrations folder in your project; And
Delete the __MigrationHistory table in your database (may be under system tables); Then
Run the following command in the Package Manager Console:
```
Enable-Migrations -EnableAutomaticMigrations -Force
```
Use with or without -EnableAutomaticMigrations
And finally, you can run:
```
Add-Migration Initial
```

Best Answer

Related Solutions

.net – Entity Framework vs LINQ to SQL

Entity-framework – Reset Entity-Framework Migrations

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