Question

我有一个ASP .NET MVC 6和Entity Framework 6，分为几层，如何在DbContext的DAL层中获取连接字符串？连接字符串在appsettings.json文件中，如下所示：

{
  "Logging": {
    "IncludeScopes": false,
    "LogLevel": {
      "Default": "Verbose",
      "System": "Information",
      "Microsoft": "Information"
    }
  },
  "Data": {
    "DefaultConnection": {
      "ConnectionString": "",
    }
  }
}

Answer 1

如果您在appsettings.json中有连接字符串，则首先要构建配置对象：

var builder = new ConfigurationBuilder().AddJsonFile("appsettings.json");
var configuration = builder.Build();

这可能应该在Startup的ctor中。然后，您可以将configuration对象存储在字段中。让我们说一个_configuration字段。

然后你可以做

// _connectionString is also a field.
_connectionString = _configuration["Data:DefaultConnection"];

您的DbContext：

public class AppDbContext : DbContext
{
    public AppDbContext(string connectionString) : base(connectionString)
    {
    }
}

您可以在AppDbContext注册ConfigureServices作为：

services.AddScoped(_ => new AppDbContext(_connectionString));

ASP .NET MVC层DAL

1 个答案: