c# - C# 是否支持 'nested' 程序，例如产生一个 IEnumerable？

Question

伪例子

public HttpResponseMessage GetAll() {

    List<MyEntity> before = MyEntityRepository.GetAll();
    return Request.CreateResponse(HttpStatusCode.OK,
        new IEnumerable<MyExtendedEntity>({
            before.ForEach(x =>
                yield return new ExtendedEntity {
                    Property1    = x.Property1,
                    Property2    = x.Property2,
                    ExtendedProp = ExtendedPropProvider.getExtended(x)
                })
         );

Answer 1

对于您的示例，为什么不只使用 Select？

public HttpResponseMessage GetAll() {

List<MyEntity> before = MyEntityRepository.GetAll();
return Request.CreateResponse(HttpStatusCode.OK,
    before.Select(x => new ExtendedEntity 
    {
       Property1    = x.Property1,
       Property2    = x.Property2,
       ExtendedProp = ExtendedPropProvider.getExtended(x)
    }));