Entity Framework Core 2.0报错：Propertybuilder未包含UseSqlServerIdentityColumn定义的解决办法

Got it, let's break down why you're hitting this error and how to fix it quickly. The core issue here is that UseSqlServerIdentityColumn was removed in EF Core 2.x — the EF team replaced it with a database-agnostic method to keep the API consistent across different database providers. Here's what you need to do:

1. Double-check your NuGet package reference #

First, make sure you have the Microsoft.EntityFrameworkCore.SqlServer package installed (version matching your EF Core 2.x release). All SQL Server-specific EF Core extension methods live in this package; if it's missing, even the correct methods won't show up in your code.

2. Replace the outdated method with UseIdentityColumn() #

Swap out the deprecated UseSqlServerIdentityColumn() call with the generic UseIdentityColumn() method. The SQL Server provider will automatically map this to SQL Server's native IDENTITY column behind the scenes, so you don't lose any functionality.

Example: Broken code (before) #

modelBuilder.Entity<YourEntity>()
    .Property(e => e.Id)
    .UseSqlServerIdentityColumn(); // This method no longer exists in EF Core 2.x

Example: Fixed code (after) #

modelBuilder.Entity<YourEntity>()
    .Property(e => e.Id)
    .UseIdentityColumn(); // Works seamlessly with SQL Server in EF Core 2.x+

3. Alternative: Use DataAnnotations instead #

If you prefer avoiding Fluent API entirely, you can configure the identity column directly on your entity class using DataAnnotations — this works perfectly in EF Core 2.x:

public class YourEntity
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int Id { get; set; }
    // Add your other entity properties here
}

Either of these approaches will set up your SQL Server identity column correctly without the missing method error.

内容的提问来源于stack exchange，提问作者user8280126