是的，这工作正常。

您需要手动设置在创建上下文时连接字符串，因为它不能从web.config中得到它

You need to manually set the connection string when creating the context since it can't get it from the web.config

这样你就可以做到这一点。

so you can do this

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

var context = new MyContext("myConnectionString");

如果你想获得从config.json连接字符串，那么试试这个

if you want to get the connection string from the config.json, then try this

IConfiguration configuration = new Configuration().AddJsonFile("config.json");
var connectionString = configuration["Data:DefaultConnection:ConnectionString"]);

如果你要注入的背景下进入DI容器，然后我加了一个工厂像这样

and if you want to inject the context into the DI Container, then I added a factory like this

public static class MyContextFactory
{
    public static MyContext GetContext() {
        IConfiguration configuration = new Configuration().AddJsonFile("config.json");
        return new MyContext(configuration["Data:DefaultConnection:ConnectionString"]);
    }

}

然后添加这startup.cs

and then added this in startup.cs

services.AddTransient<MyContext>((a) => MyContextFactory.GetContext());