run EF6 async request in mvc controller - asp.net-mvc

Question

I have mvc 5 and EF6 and never really use async in mvc before so want ask best way for run sql requests.
public ActionResult SearchTest(string id)
{
string searchtxt = UsefulClass.ConvertObjectToString(id).Replace(",", " ").Trim();
var model = new SearchResult();
if (!String.IsNullOrEmpty(searchtxt))
{
//get the data from 3 requests
var ArtistList = _db.Artists.SqlQuery("SELECT top 6 * FROM Artists WHERE CONTAINS(Name, N'Queen') and TopTracksStatus = 1 and GrabStatus > 1 order by playcount desc").ToList();
var tracks = _db.Database.SqlQuery<TrackInfo>("exec SearchTracks #SearchText=N'Queen', #TopCount=10,#LengthCount=100").ToList();
var TagsList = _db.Tags.Where(x => x.TagName.Contains(searchtxt)).Take(5).ToList();
//work with ArtistList and add to model
if (ArtistList.Any())
{
int i = 0;
foreach (var artist in ArtistList)
{
i++;
if (i == 1) //top artist
{
model.BestArtist = artist;
model.BestArtistTrackCount = _db.TopTracks.Count(x => x.Artist_Id == artist.Id);
}
else
{
model.ArtistList = ArtistList.Where(x => x.Id != model.BestArtist.Id);
break;
}
}
}
//work with tracks and add to model
if (tracks.Any())
{
model.TopTrackList = tracks;
}
//work with tags and add to model
if (TagsList.Any())
{
model.TagList = TagsList;
}
}
return View(model);
}
Here I have 3 requests which return ArtistList, tracks, TagsList and I need add them to model and then pass to view. How to do it in async way?

Answer 1

Try below example, hope it gives you a good idea.
public async Task<ActionResult> SearchTestAsync(string id)
{
string searchtxt = UsefulClass.ConvertObjectToString(id).Replace(",", " ").Trim();
var model = new SearchResult();
if (!String.IsNullOrEmpty(searchtxt))
{
var art = GetArtistListResulst(model);
var track = GetTracksResults(model);
var tag = GetTagsListResults(model,searchtxt);
await Task.WhenAll(art, track, tag);
}
return View(model);
}
private Task GetArtistListResulst(SearchResult model)
{
return Task.Run(() =>
{
var artistList = _db.Artists.SqlQuery("SELECT top 6 * FROM Artists WHERE CONTAINS(Name, N'Queen') and TopTracksStatus = 1 and GrabStatus > 1 order by playcount desc").ToList();
// You don't need to use foreach because the artistList is ordered by playcount already.
model.BestArtist = artistList.Take(1);
model.BestArtistTrackCount = _db.TopTracks.Count(x => x.Artist_Id == model.BestArtist.Id);
model.ArtistList = artistList.Where(x => x.Id != model.BestArtist.Id);
});
}
private Task GetTracksResults(SearchResult model)
{
return Task.Run(() =>
{
model.TopTrackList = _db.Database.SqlQuery<TrackInfo>("exec SearchTracks #SearchText=N'Queen', #TopCount=10,#LengthCount=100").ToList();
});
}
private Task GetTagsListResults(SearchResult model, string searchtxt)
{
return Task.Run(() =>
{
model.TagsList = _db.Tags.Where(x => x.TagName.Contains(searchtxt)).Take(5).ToList();
});
}