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在存储库中,我保留了一些在我的应用程序的整个生命周期中存在的实例,但有时我需要立即用另一个实例和LightInject替换此实例,即使将新实例传递给container.GetInstance构造函数覆盖。如何使用传递给构造函数的新实例覆盖已在LightInject中注册的类型?
下面是一个片段显示问题:
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");
}
}
为什么LightInject先前注册的情况下优先,如果我给明确的实例中的GetInstance电话吗?如何解决这个问题并用其中一个参数的替代实例构造对象?