c# 像委托方法一样传递内联接口

Question

i',m using this syntax in java:

 public interface Interaction
    {
        void onSuccess(String result);
        void onFailure(String error);
    }

    void getData(Interaction interaction)
    {
        //someCode
        interaction.onSuccess("foo");
    }

    void main()
    {
        getData(new Interaction()
        {
            @override
            void onSuccess(String result)
            {
                    //here is sucess part 
            }

            @override
            void onFailure(String error)
            {
                   //here is failure part 
            }
        })
    }

i'm new at c# coding. how can i implement that structure in c#? does c# support inline instance interface as java?

Answer 1

One way to redesign this is to accept two Action<string> parameters:

void GetData(Action<string> onSuccess, Action<string> onFailure)
{
    //someCode
    onSuccess("foo");
}

void Main()
{
    GetData(onSuccess: result => {
        // success part...
    }, onFailure: error => {
        // failure part
    });
}

Another way is to keep the IInteraction interface:

public interface IInteraction
{
    void OnSuccess(String result);
    void OnFailure(String error);
}

void GetData(IInteraction interaction)
{
    //someCode
    interaction.OnSuccess("foo");
}

But have a concrete class GenericInteraction that implements IInteraction :

class GenericInteraction : IInteraction {
    private Action<string> onSuccess;
    private Action<string> onFailure;
    public GenericInteraction(Action<string> onSuccess, Action<string> onFailure) {
        this.onSuccess = onSuccess;
        this.onFailure = onFailure;
    }

    public void OnSuccess(String result) { onSuccess(result); }
    public void OnFailure(String error) { onFailure(error); }
}

This way, the caller of the method can choose to either pass in onSuccess and onFailure "inline":

GetData(new GenericInteraction(onSuccess: result => {
    // success part...
}, onFailure: error => {
    // failure part
}));

Or pass something else that implements IInteraction :

GetData(someOtherInteractionICreated);

Which is closer to what you could do in Java.