identityserver4 中的 ConfigurationDbContext 可用扩展？

Question

是否有任何可用于 ConfigurationDbContext 的扩展，我们可以在使用 IdentityServer4 时为任何其他字段或索引自定义上下文？

是否可以扩展 IdentityServer4 提供的模型？

Answer 1

我猜你问的是如何自定义 EntityFramework.DbContexts.Config

你可以从下面的代码中得到一些想法

public class CustomConfigurationContextFactory : IDbContextFactory<CustomConfigurationDbContext>
{
    /// <summary>
    /// A factory to create an instance of the StudentsContext 
    /// </summary>
    /// <param name="connectionString"></param>
    /// <returns></returns>
    public static CustomConfigurationDbContext Create(string connectionString)
    {
        var optionsBuilder = new DbContextOptionsBuilder<ConfigurationDbContext>();

        optionsBuilder.UseSqlServer(connectionString);

        var context = new CustomConfigurationDbContext(
            optionsBuilder.Options, 
            new ConfigurationStoreOptions());
        context.Database.EnsureCreated();

        return context;
    }

    public CustomConfigurationDbContext Create(DbContextFactoryOptions options)
    {
        var context = new CustomConfigurationDbContext(
            new DbContextOptions<ConfigurationDbContext>(),
            new ConfigurationStoreOptions() 
          );

        context.Database.EnsureCreated();

        return context;
    }
    protected override void OnModelCreating(ModelBuilder builder)
    {
        builder.ConfigureClientContext(_storeOptions);
        builder.Entity<Client>().HasIndex(x => x.ClientName).IsUnique();
    }
}

public class CustomConfigurationContextFactory : IDbContextFactory<CustomConfigurationDbContext>
{
    public CustomConfigurationDbContext Create(DbContextFactoryOptions options)
    {
        var context = new CustomConfigurationDbContext(
            new DbContextOptions<ConfigurationDbContext>(),
            new ConfigurationStoreOptions() 
          );

        context.Database.EnsureCreated();

        return context;
    }
}

OnModelCreating您可以添加索引，也可以将您的自定义 Dbset 添加到自定义配置 dbcontext 中

Answer 2

您可以在 Asp.net Core 中像这样扩展 ConfigurationDbContext 类：

    public class MyNewModel
    {
      public int Id { get; set; }
      public string Name { get; set; }
    }

   public class MyOtherNewModel
   {
      public int Id { get; set; }
      public ApiResource ApiResource { get; set; }//<-- This is built-in model for identityserver4.
      public MyNewModel MyNewModel { get; set; }
      public List<ApiClaims> ApiClaims {get; set;} //<-- This will add a "MyOtherNewModelId" field into built-in ApiClaims table.
   }

    public class IdentityProviderDbContext : ConfigurationDbContext
    {
      public IdentityProviderDbContext(DbContextOptions<ConfigurationDbContext> options, ConfigurationStoreOptions storeOptions) : base(options, storeOptions)
      { }

      public DbSet<MyNewModel> MyNewModelTable { get; set; }

      public DbSet<MyOtherNewModel> MyOtherNewModelTable { get; set; }

      //...
    }

然后我们可以在控制台中使用以下命令：

add-migration InitialDeriveFromBaseClass -context IdentityProviderDbContext

您还可以设法在单独的类库中扩展它，如下所示：
1- 创建一个新的 .net 核心类库。
2- 像这样更改上面的IdentityProviderDbContext 类：

    public class IdentityProviderDbContext : ConfigurationDbContext
    {
    //TODO: This connecton string will be removed as soon as possible.
    string connectionString = "Server=.;Database=SomeDb;Trusted_Connection=True;MultipleActiveResultSets=true";

    public IdentityProviderDbContext(DbContextOptions<ConfigurationDbContext> options)
        : base(options,
             new ConfigurationStoreOptions()
             {
                 ConfigureDbContext = configureOptions =>
                    configureOptions.UseSqlServer("Server=.;Database=SomeDb;Trusted_Connection=True;MultipleActiveResultSets=true",
                                                sql => sql.MigrationsAssembly(typeof(IdentityProviderDbContext).GetTypeInfo().Assembly.GetName().Name))
             })
    { }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder.UseSqlServer(connectionString);
    }
    //...
    // The other parts are the same as above code snippet.

也许我们应该以更合适的方式进行连接字符串（对 SOLID 更友好）。但这只是一个例子。
3- 添加一个名为IdentityProviderDbContextFactory 的新类，以告知实体框架如何生成迁移。

class IdentityProviderDbContextFactory : IDesignTimeDbContextFactory<IdentityProviderDbContext>
{
    public IdentityProviderDbContext CreateDbContext(string[] args)
    {
        var optionsBuilder = new DbContextOptionsBuilder<ConfigurationDbContext>();
        optionsBuilder.UseSqlServer("Server=.;Database=SomeDb;Trusted_Connection=True;MultipleActiveResultSets=true");

        return new IdentityProviderDbContext(optionsBuilder.Options);
    }
}

4- 运行 add-migration 命令
并完成。

如果你想在现有的内置模型中添加一个字段，也许你应该阻止 EF 生成original class model（在OnConfiguring() 或某处），而是引入一个derived model（从那个original model )