问API版本控制和在版本更新上重用现有实现

EN

[ApiVersion( "2.0" )]
[ApiVersion( "3.0" )]
[RoutePrefix( "api/helloworld" )]
public class HelloWorld2Controller : ApiController
{
    [Route]
    public string Get() => "Hello world v2.0!";

    [Route, MapToApiVersion( "3.0" )]
    public string GetV3() => "Hello world v3.0!";
}

[RoutePrefix("api/v{version:apiVersion}/values")]
[ApiVersion( "1.0" )]
public class ValuesController : ApiController
{
    // GET api/values
    [Route]
    public IEnumerable<string> Get()
    {
        return new string[] { "value1", "value2" };
    }

    // GET api/values/5
    [Route("{id:int}")]
    [Route, MapToApiVersion( "1.0" )]
    public string Get(int id)
    {
        return id.ToString();
    }
}


[RoutePrefix("api/v{version:apiVersion}/values")]
[ApiVersion( "2.0" )]
public class ValuesControllerV2 : ValuesController
{
    // GET api/values/5
    [Route("{id:int}")]
    [Route, MapToApiVersion( "2.0" )]
    public string Get(int id)
    {
        return id.ToString();
    }
}