传递接口时如何访问不同具体类的属性 [英] How to access the property of different concrete classes when interface is passed

问题描述

我正在学习C#，并试图了解将接口传递给使用者类时如何访问类的不同属性.请引导我.

I am learning C# and trying to understand how to access different property of classes when interface being passed to the consumer class. Please guide me.

public interface ITest
{
    int ID {get; set;}
}

public class TestA: ITest
{
    public int A {get; set;}
}

public class TestB: ITest
{
    public int B {get; set;}
}


public void Test(ITest test)
{
    // how to check/access property of TestA 
    // how to check/access property of TestB
}

尝试:

   public void Test(ITest test)
    {
        if(test.GetType() == typeof(TestA))
        {
             test.A = 45678;
        }
    }

推荐答案

如果您需要对接口的继承者进行特定于实现的操作，请不要嗅探类型...编写特定于实现的方法这个给你.现在，调用者无需进一步了解该接口:

If there's something implementation-specific that you need to do with inheritors of your interface, don't sniff type... write an implementation-specific method to do this for you. Now the caller doesn't need to know anything further about the interface:

void Main()
{
    var tests = new ITest[] { new TestA { A = 1, ID = 0 }, new TestB { B = 10, ID = 1 } };
    foreach (var test in tests)
    {
        test.DoSomeProcessing();
    }
}

public interface ITest
{
    int ID { get; set; }
    void DoSomeProcessing();
}

public class TestA : ITest
{
    public int A { get; set; }
    public int ID { get; set; }
    public void DoSomeProcessing()
    {
        Console.WriteLine("A = " + this.A);
    }
}

public class TestB : ITest
{
    public int B { get; set; }
    public int ID { get; set; }
    public void DoSomeProcessing()
    {
        Console.WriteLine("B = " + this.B);
    }
}

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