尝试执行添加迁移时，.NET Core软件包管理器控制台挂起

Question

当我要添加迁移时，这些是我在键入add-migration命令之前执行的步骤：

1. $ env：CENTRAL_APPLICATION_SETTINGS =“ C：\ Users \ amosa \ source \ repos \ DotNetCore \ CentralApplicationSettings \ CentralApplicationSettings”
2. $ env：DOCUMENT_STUDIO_CONNECTIONSTRING =“服务器=。\ SQLEXPRESS;数据库= DBONE; Trusted_Connection = False; MultipleActiveResultSets = true;用户ID =用户;密码=密码”
3. $ env：DOCUMENT_STUDIO_DSSCHEMA =“ DocumentStudio”
4. $ env：ASPNETCORE_ENVIRONMENT =“开发”

添加迁移DocumentStudioBaseMigration -Context DocumentStudioDbContext -OutputDir Migrations \ DocumentStudioMigrations

这是我使用的dbcontext文件：

public DocumentStudioDbContext(DbContextOptions<DocumentStudioDbContext> options) : base(options) { }
public DbSet<Documents> Documents { get; set; }
public DbSet<DocumentCategories> DocumentCategories { get; set; }
public DbSet<DocumentFields> DocumentFields { get; set; }
public DbSet<DocumentFieldsStore> DocumentFieldsStore { get; set; }
public DbSet<DocumentFieldPermissions> DocumentFieldPermissions { get; set; }

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    modelBuilder.HasDefaultSchema(schema: Environment.GetEnvironmentVariable(DSCASGlobals.DS_DatabaseSchema));
    base.OnModelCreating(modelBuilder);
}

当我进入添加迁移部分时，我的包管理器只是挂起而什么也不做。我以前从未遇到过这个问题，似乎什么也没发生。