C＃中的接口转换？ [英] Interface casting in C#?

问题描述

我有一个界面：

I have an interface:

namespace IVR.VoiceElementsEngine
{
    public interface IVoiceResource
    {
        void ClearDigitBuffer();
    }
}

执行：

And the implementation:

namespace IVR.VoiceElementsEngine
{
    public class VoiceElementsResource:IVoiceResource
    {
        private readonly VoiceResource _voiceResource;
        public VoiceElementsResource(VoiceResource voiceResource)
        {
            _voiceResource = voiceResource;
        }
        
        public void ClearDigitBuffer()
        {
            _voiceResource.ClearDigitBuffer = true;
        }
    }
}

现在在另一个班级，我有

Now in another class, I have

namespace IVR.VoiceElementsEngine.CallObjects
{
    public class VoiceElementsLine : ILine
    {
        public IVoiceResource IncomingVoiceResource { get; set; }
        
        public VoiceElementsLine()
        {
            
        }
        public VoiceElementsLine(IVoiceResource voiceElementsResource):this()
        {
            IncomingVoiceResource = voiceElementsResource;
        }
    }
}

在我与Moq的单元测试中，我有：

In my unit test with Moq, I have:

namespace IVR.Tests
{
    public class VoiceElementsLineTest
    {
        [Fact]
        public void PlayPromptTextToSpeech_Should_Play_A_Text()
        {
            // ARRANGE
            var voiceResourceMock = new Mock<IVoiceResource>();
            var voiceResource = voiceResourceMock.Object;
            var line = new VoiceElementsLine(voiceResource);

我收到错误：

错误CS1503参数1：无法从'VoiceElements.Interface.IVoiceResource'转换为'IVR.VoiceElementsEngine.IVoiceResource'

我猜它是为具体实现构建接口问题。如何解决？

I got the error:
Error CS1503 Argument 1: cannot convert from 'VoiceElements.Interface.IVoiceResource' to 'IVR.VoiceElementsEngine.IVoiceResource'
I guess that it is "cast an interface to a concrete implementation" issue. How to fix it?

推荐答案

看起来你有两个版本的界面。一个在VoiceElements.Interface中，另一个在IVR.VoiceElementsEngine中。为了能够进行转换，你必须实现相同的接口实例。



当我从加载的程序集中加载单个接口时，我遇到了类似的问题直接引用它。这不起作用，因为它们不是同一个实例。



你必须拥有两个类都实现的接口版本。

It looks like you have two versions of the interface. One in VoiceElements.Interface and another in IVR.VoiceElementsEngine. To be able to cast you must implement the same instance of the interface.

I had a similar problem when I was loading a single interface from a loaded assembly as well as referencing it directly. This did not work because they were not the same instance.

You must have a version of the interface that both classes implement.

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