在存储库中,我保留了一些在应用程序的整个生命周期中都存在的实例,但有时我需要立即用另一个实例和 LightInject 替换此类实例,即使将新实例传递给 container.GetInstance 构造函数覆盖也是如此。
这是一个显示问题的片段:
internal class ClassA
{
public string Name { get; private set; }
public ClassA(string name)
{
Name = name;
}
public override string ToString()
{
return Name;
}
}
internal class ClassB
{
public ClassA A { get; private set; }
public ClassB(ClassA a)
{
A = a;
}
public override string ToString()
{
return string.Format("I contain {0}", A);
}
}
private void TestContainer()
{
var container = new LightInject.ServiceContainer();
var a1 = new ClassA("A instance 1");
container.Register(x => a1);
container.Register<ClassB>();
var a2 = new ClassA("A instance 2");
var bwitha1 = container.GetInstance<ClassB>();
if(bwitha1.A != a1)
{
throw new InvalidOperationException("This will not happen");
}
var bwitha2 = container.GetInstance<ClassA, ClassB>(a2);
if(bwitha2.A != a2)
{
throw new InvalidOperationException("Something went wrong here");
}
}
如果我在 GetInstance 调用中给出显式实例,为什么 LightInject 以前注册的实例优先?如何解决该问题并使用其中一个参数的替代实例构造对象?