c# - 如何在 Entity Framework Core 中将连接字符串传递给 DBContext？

Question

是否可以DbContext在构造函数中配置/传递连接字符串？

public partial class MyContext : DbContext
{
    public MyContext() { }
    public MyContext(DbContextOptions<MyContext> options) : base(options) { }
}

MyContext opt = new MyContext("con_str");

而不是硬编码：

protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
    optionsBuilder.UseSqlServer(
        @"Server=(localdb)\mssqllocaldb;Database=MyDB;Integrated Security=True");
}

我如何使用：

DbContextOptions<MyContext> opts;

以下答案：将连接字符串传递给代码优先的 DbContext不起作用。

Answer 1

启动.cs

services.AddDbContext<YourDbContext>(options =>
{
     options.UseSqlServer(Configuration.GetSection("YourConn").Value);
     options.UseQueryTrackingBehavior(QueryTrackingBehavior.NoTracking);
});

应用设置.json

"YourConn": "yourconnectionstring"

已编辑

YourDbContext.cs

public partial class MyContext : DbContext
{
    private string _conn = "";
    public MyContext(string conn) 
    { 
        _conn = conn;
    }
    public MyContext(DbContextOptions<MyContext> options) : base(options) { }
    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
         optionsBuilder.UseSqlServer(_conn);
    }
}

然后你可以使用

MyContext opt = new MyContext("con_str");