[英]how to implement autofac dependency injection with parameter in constructor or with any condition?
Before using any dependency injection
我将使用简单的interface
制作一个loosely coupled code
如下所示:
Program.cs
class Program
{
static void Main(string[] args)
{
Customer obj = new Customer(new OracleData());
obj.Add();
}
}
客户.cs
public class Customer
{
private Idata iobj;
public Customer(Idata newiobj)
{
iobj = newiobj;
}
public void Add()
{
iobj.AddData();
}
}
OracleData.cs
public class OracleData : Idata
{
public void AddData()
{
throw new NotImplementedException();
}
}
SQLData.cs
public class SQLData : Idata
{
public void AddData()
{
throw new NotImplementedException();
}
}
idata.cs
public interface Idata
{
void AddData();
}
现在,我使用Autofac
DI库进行了尝试-我想知道它始终是最后注入的类对象,如何使用构造函数或任何条件设置resolve对象?
Autofac DI编写代码-
static void Main(string[] args)
{
var builder = new ContainerBuilder();
builder.RegisterType<Customer>();
builder.RegisterType<OracleData>().As<Idata>();
builder.RegisterType<SQLData>().As<Idata>();
var container = builder.Build();
using (var scope = container.BeginLifetimeScope())
{
var app = scope.Resolve<Idata>();
app.AddData();
}
//commented
//Customer obj = new Customer(new OracleData());
//obj.Add();
}
如果需要定义在入口点将使用的实现,则可以执行以下操作:
static void Main(string[] args)
{
var builder = new ContainerBuilder();
builder.RegisterType<Customer>();
if(args[0] == "oracle")
builder.RegisterType<OracleData>().As<Idata>();
else
builder.RegisterType<SQLData>().As<Idata>();
var container = builder.Build();
using (var scope = container.BeginLifetimeScope())
{
var app = scope.Resolve<Idata>();
app.AddData();
}
//commented
//Customer obj = new Customer(new OracleData());
//obj.Add();
}
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