What is the best way to return a list from an Async method?-CodePudding

I'm writing an RSS reader using this example https://github.com/dotnet/SyndicationFeedReaderWriter

I want to record all ISyndicationItem's to return as a list. The compiler error I'm getting is "Error CS1983 The return type of an async method must be void, Task, Task<T>, a task-like type, IAsyncEnumerable<T>, or IAsyncEnumerator<T>" What is the most ideal way to do this?

using Microsoft.SyndicationFeed;
using Microsoft.SyndicationFeed.Rss;
using System.Collections.Generic;
using System.Xml;

static async List<ISyndicationItem> ReadRSSFeed(string inputUri)
{
    var itemList = new List<ISyndicationItem>();
    using (var xmlReader = XmlReader.Create(inputUri,
        new XmlReaderSettings() { Async = true }))
    {
        var feedReader = new RssFeedReader(xmlReader);

        while (await feedReader.Read())
        {
            switch (feedReader.ElementType)
            {
                // Read category
                case SyndicationElementType.Category:
                    ISyndicationCategory category = await feedReader.ReadCategory();
                    break;

                // Read Image
                case SyndicationElementType.Image:
                    ISyndicationImage image = await feedReader.ReadImage();
                    break;

                // Read Item
                case SyndicationElementType.Item:
                    ISyndicationItem item = await feedReader.ReadItem();
                    itemList.Add(item);
                    break;

                // Read link
                case SyndicationElementType.Link:
                    ISyndicationLink link = await feedReader.ReadLink();
                    break;

                // Read Person
                case SyndicationElementType.Person:
                    ISyndicationPerson person = await feedReader.ReadPerson();
                    break;

                // Read content
                default:
                    ISyndicationContent content = await feedReader.ReadContent();
                    break;
            }
        }
    }
    return itemList;
}

CodePudding user response：

Just return Task<T> instead of T. Inside the method you still return an instance of T.

So should be:

static async Task<List<ISyndicationItem>> ReadRSSFeed(string inputUri)