linq - System.IObservable<字符串> 到 System.IObservable<System.Collections.Generic.List<字符串>>

Question

如何转换System.IObservable<string>至System.IObservable<System.Collections.Generic.List<string>> ？

public static IObservable<List<string>> GetUrlList(Uri url) {
  var result = (from request in Observable.Return(GetWebRequest(url, false))
    from response in Observable.FromAsyncPattern<WebResponse>(
    request.BeginGetResponse, request.EndGetResponse)()
      from item in GetUrlCollection(response).ToObservable()
    select item);
  return result;
}

这里项目的类型是“字符串列表”。我需要将其转换为 IObservable List of strings 。我怎样才能实现这个目标？

Answer 1

试试这个:

public static IObservable<List<string>> GetUrlList(Uri url)
{
    var result = (
        from request in Observable.Return(
            GetWebRequest(url, false))
        from response in Observable.FromAsyncPattern<WebResponse>(
            request.BeginGetResponse, request.EndGetResponse)()
        from item in GetUrlCollection(response)
            .ToObservable()
            .ToArray()
        select item
            .ToList());
    return result;
}

我对整个方法唯一关心的是您的 GetUrlCollection(response) 返回一个可枚举的值。您确实应该对此进行编码以返回可观察的。