,假设我有一个小的MVC核心应用程序,我想在两个数据库引擎之间切换而没有太多麻烦(例如,我有实体框架核心和mongodb)。
在我的appsettings.json中,我有以下节点:
{
"UseMongo": false,
"MongoDB": {
"ConnectionString": "mongodb://127.0.0.1",
"DatabaseName": "CoreDB",
"IsSSL": true
},
"EntityDB": {
"ConnectionString": "mongodb://127.0.0.1",
"DatabaseName": "CoreDB"
}
}
然后在我的startup.cs中,我有以下代码:
if (Configuration.GetValue<bool>("UseMongo"))
{
MongoDbContext.ConnectionString = Configuration.GetSection("MongoDB:ConnectionString").Value;
MongoDbContext.DatabaseName = Configuration.GetSection("MongoDB:DatabaseName").Value;
//Somehow inject context into application so it is available globally
}
else
{
EfDbContext.ConnectionString = Configuration.GetSection("EntityDB:ConnectionString").Value;
EfDbContext.DatabaseName = Configuration.GetSection("EntityDB:DatabaseName").Value;
//Somehow inject context into application so it is available globally
}
然后 public interface IRepository : IDisposable
{
void GetData();
}
public class EfRepository : IRepository
{
public void GetData()
{
//DB logic
}
}
public class MongoRepository : IRepository
{
public void GetData()
{
//DB logic
}
}
到目前为止一切都很好。现在,我想根据我的appsettings.json中的" usemongo"开关使用一个存储库类。我已经看了依赖注入,但没有找到解决方案。我希望能够在控制器中这样做:
public class ValuesController : Controller
{
private IRepository _repository;
public ValuesController(IRepository repository)
{
_repository= repository;
}
}
这样可行吗?
您可以这样做
if (Configuration.GetValue<bool>("UseMongo"))
{
services.AddScoped(typeof(IRepository),typeof(MongoRepository))
}
else
{
services.AddScoped(typeof(IRepository),typeof(EfRepository))
}