EF Core 中的 ConnectionStrings DbContext

Question

我不知道自己做错了什么，非常努力地设置数据库项目，并不断收到与连接字符串 dbcontext 相关的错误。

我有一个刚刚连接到 localdb 的 applicationdbcontext

问题是我的另一个 dbcontext，我的数据似乎在错误的位置，我不知道如何修复它。此代码在我的模型文件夹中

public DbSet<Customer> Customers { get; set; }
public DbSet<Job> Jobs { get; set; }
public DbSet<Order> Orders { get; set; }
public DbSet<Staff> Staff { get; set; }
public DbSet<RequestType> RequestType { get; set; }
public DbSet<CustomerJob> CustomerJobs { get; set; }

protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
    optionsBuilder.UseSqlServer("Server=(localdb)\\mssqllocaldb;Database=Customers;Trusted_Connection=True;");
}

在 startup.cs 我有这个代码.. services.AddDbContext（选项 => options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection"))); services.AddDbContext（选项 => options.UseSqlServer(Configuration.GetConnectionString("ProdConnection")));

在我的 appsettings 配置中，我有这个代码..

"ConnectionStrings": {
    "DefaultConnection": "Server=(localdb)\\mssqllocaldb;Database=BRSCRM;Trusted_Connection=True;MultipleActiveResultSets=true",
    "ProdConnection": "Server=(localdb\\mssqllocaldb;Database=Customers;Trusted_Connection=True;MultipleActiveResults=true"
},

然而，当我运行我的项目时，我得到一个错误，提供的配置没有被使用，DI 控制反转确实，它是一袋猫，它着火了！

Answer 1

您应该删除OnConfiguring 方法中的optionsBuilder.UseSqlServer("... 行。

然后像这样向你的 DbContext 类添加一个构造函数；

public YourDbContext(DbContextOptions<YourDbContext> options) : base(options)
{
}

添加 DbContext 类..

 public class CustomerContext : DbContext
{
    public DbSet<Customer> Customers { get; set; }
    public DbSet<Job> Jobs { get; set; }
    public DbSet<Order> Orders { get; set; }
    public DbSet<Staff> Staff { get; set; }
    public DbSet<RequestType> RequestType { get; set; }
    public DbSet<CustomerJob> CustomerJobs { get; set; }
    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder.UseSqlServer("Server=(localdb)\\mssqllocaldb;Database=Customers;Trusted_Connection=True;");
    }
    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        //modelBuilder.Entity<CustomerJob>()
        //    .HasKey(c => new { c.JobId, c.CustomerId });
        //code to require a staff member be assigned..

       // modelBuilder.Entity<Staff>().Property(s => s.Name).IsRequired();
        //  modelBuilder.Entity<Customer>().Property(c => c.AssignedStaff).IsRequired();
    }


}


public class CustomerJob
{
    public int CustomerJobId { get; set; }
    public int CustomerId { get; set; }
    public DateTime RequestDate { get; set; }
    public int JobId { get; set; }
    public Job Job { get; set; }
}

public class Job
{
    public int JobId { get; set; }
    public int CustomerId { get; set; }

    public string BusinessName { get; set; }
    public string Name { get; set; }
    public string JobDescription { get; set; }
    public string ServiceType { get; set; }
    public string GoogleLink { get; set; }
    public string PoisLink { get; set; }
    public bool EquisRendered { get; set; }
    public bool NadirsRemoved { get; set; }
    public string FolderLink { get; set; }
    public string ReviewPosted { get; set; }
    public string Ingestion { get; set; }
    public string Moderated { get; set; }
    public bool Delivered { get; set; }
    public string CustomerReview { get; set; }
    public string PublishedLink { get; set; }
    public DateTime RequestDate { get; set; }
    public DateTime LastModifiedDate { get; set; }
    public DateTime ScheduleShootDate { get; set; }
    public DateTime CompletionDate { get; set; }
    public List<CustomerJob> CustomerJobs { get; set; }
    public Staff AssignedStaff { get; set; }
}

public class Staff
{
    public int StaffId { get; set; }
    public string Name { get; set; }
    public string Phone { get; set; }
    public string EMail { get; set; }
}

public class Order
{
    public int OrderID { get; set; }
    public int CustomerID { get; set; }
    public int Order_Detail_Id { get; set; }
    public List<Job> Job { get; set; }
}

public class RequestType
{
    public int ID { get; set; }
    public string Description { get; set; }
}

}

Startup.cs 类..

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    // This method gets called by the runtime. Use this method to add services to the container.
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddDbContext<ApplicationDbContext>(options =>
            options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
        services.AddDbContext<CustomerContext>();

        services.AddIdentity<ApplicationUser, IdentityRole>()
            .AddEntityFrameworkStores<ApplicationDbContext>()
            .AddDefaultTokenProviders();

        // Add application services.
        services.AddTransient<IEmailSender, EmailSender>();
        // Add Oauth Options 
        /* Third Party Login Authenticaton Options Google */
        services.AddAuthentication().AddGoogle(googleOptions =>
        {
            googleOptions.ClientId = Configuration["Authentication:Google:ClientId"];
            googleOptions.ClientSecret = Configuration["Authentication:Google:ClientSecret"];
        });
        /* End Google Options */
        /* Begin Facebook Options  */
        services.AddAuthentication().AddFacebook(facebookOptions =>
        {
            facebookOptions.AppId = Configuration["Authentication:Facebook:AppId"];
            facebookOptions.AppSecret = Configuration["Authentication:Facebook:AppSecret"];
        });

        /* End Facebook Options  */

        /* Begin Microsoft Options */
        services.AddAuthentication().AddMicrosoftAccount(microsoftOptions =>
        {
            microsoftOptions.ClientId = Configuration["Authentication:Microsoft:ApplicationId"];
            microsoftOptions.ClientSecret = Configuration["Authentication:Microsoft:Password"];
        });

        /* End Microsoft Options  */

        /* Twitter Options  */
        services.AddAuthentication().AddTwitter(twitterOptions =>
        {
            twitterOptions.ConsumerKey = Configuration["Authentication:Twitter:ConsumerKey"];
            twitterOptions.ConsumerSecret = Configuration["Authentication:Twitter:ConsumerSecret"];
        });
        /* End Twitter Options */
        /* Begin Identity Options Configuration   */
        services.AddMvc();
        services.AddAuthorization(options =>
        {
            options.AddPolicy("RequireAdminRole", policy => policy.RequireRole("Admin"));
        });
    }

无论如何它现在可以工作，我的错误是我在 2 个单独的地方定义了连接，我猜这引发了异常。