EF Core Code First - 聚集索引和标识列 [英] EF Core Code First - Clustered Index and Identity Column

问题描述

我正在使用 EF Core 2.0 创建一个表，其中主键是 GUID，聚集索引是一个自动递增的 INT 列.但我收到此错误:

I am using EF Core 2.0 to create a table in which the primary key is a GUID and the clustered index is an auto-incrementing INT column. But I'm getting this error:

不能在表 'Tenants' 上创建多个聚集索引.在创建另一个聚集索引之前删除现有的聚集索引 'PK_Tenants'

Cannot create more than one clustered index on table 'Tenants'. Drop the existing clustered index 'PK_Tenants' before creating another

这是创建实体和 Fluent API 的代码.

This is the code for creating entity and Fluent API.

Tenant.cs

public class Tenant : EntityBase
{
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int ClusteredId { get; set; }
    public new Guid TenantId { get; set; }

    public string TenantCode { get; set; }
}

FluentAPI

protected override void OnModelCreating(ModelBuilder builder)
{
        builder.Entity<Tenant>().HasIndex(c => c.TenantId).ForSqlServerIsClustered(false);
        builder.Entity<Tenant>().HasIndex(c => c.ClusteredId).HasName("ClusteredId").ForSqlServerIsClustered(true);

        base.OnModelCreating(builder);
}

请建议如何消除此错误并为 GUID 创建主键和为自动递增 INT 列创建聚集索引.

Please suggest, how to remove this error and create primary key for GUID and clustered index for auto-incrementing INT column.

谢谢.

推荐答案

未明确维护 PK 索引.在 EF Core 中，它可以通过 KeyBuilder fluent API 进行配置(注意用 HasKey 代替 HasIndex):

The PK index is not maintained explicitly. In EF Core it can be configured via KeyBuilder fluent API (note the HasKey in place of HasIndex):

    builder.Entity<Tenant>().HasKey(c => c.TenantId).ForSqlServerIsClustered(false);
    builder.Entity<Tenant>().HasIndex(c => c.ClusteredId).HasName("ClusteredId").ForSqlServerIsClustered(true);

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