Unity의 RegisterInstance <…>가 왜 Unity가 여러 인스턴스를 반환하게합니까?
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19-08-2019 - |
문제
Unity의 문서화는 인스턴스를 등록하는 RegisterInstance <> 메소드에 대해 설명합니다. 해당 특정 인스턴스는 Resolve <>가 호출됩니다..
그러나 아래 의이 예는 매번 Resolve <>가 호출되었음을 보여줍니다. 유형의 새 인스턴스가 반환됩니다.
왜 이런거야?
using System;
using System.Windows;
using Microsoft.Practices.Unity;
namespace TestUnity34
{
public partial class Window1 : Window
{
public Window1()
{
InitializeComponent();
Validator validator1 = new Validator();
IUnityContainer container = new UnityContainer();
container.RegisterInstance<IValidator>(validator1);
Validator validatorCopied = validator1;
Console.WriteLine(validator1.GetHashCode()); //14421545
Console.WriteLine(validatorCopied.GetHashCode()); //14421545
Validator validator2 = container.Resolve<Validator>();
Console.WriteLine(validator2.GetHashCode()); //35567111
Validator validator3 = container.Resolve<Validator>();
Console.WriteLine(validator3.GetHashCode()); //65066874
}
}
interface IValidator
{
void Validate();
string GetStatus();
}
public class Validator : IValidator
{
public void Validate() { }
public string GetStatus() { return "test"; }
}
}
해결책
You have configured your container with IValidator so you will have to resolve using IValidator instead of Validator:
Validator validator1 = new Validator();
IUnityContainer container = new UnityContainer();
container.RegisterInstance<IValidator>(validator1);
Validator validatorCopied = validator1;
Console.WriteLine(validator1.GetHashCode());
Console.WriteLine(validatorCopied.GetHashCode());
IValidator validator2 = container.Resolve<IValidator>();
Console.WriteLine(validator2.GetHashCode());
IValidator validator3 = container.Resolve<IValidator>();
Console.WriteLine(validator3.GetHashCode());
Alternatively you can keep your registration using Validator but then you have to resolve using Validator as well:
Validator validator1 = new Validator();
IUnityContainer container = new UnityContainer();
container.RegisterInstance<Validator>(validator1);
Validator validatorCopied = validator1;
Console.WriteLine(validator1.GetHashCode());
Console.WriteLine(validatorCopied.GetHashCode());
Validator validator2 = container.Resolve<Validator>();
Console.WriteLine(validator2.GetHashCode());
Validator validator3 = container.Resolve<Validator>();
Console.WriteLine(validator3.GetHashCode());
다른 팁
I think if you called Resolve with IValidator as the type parameter, it would work as you expect:
...
var validator2 = container.Resolve<IValidator>();
...
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