CODEWITHSUNDEEP
c#.netasync-await
Michael
Michael

Reputation: 13614

The 'await' operator can only be used within an async lambda expression error

I have this function:

    public async Task<IEnumerable<RegionBreif>> GetAsync()
    {

    return await Table.Where(x => x.SiteId == _siteId).Select(r => new RegionBreif
    {
        IsServiceable = await RegionBreif.checkIfServicable(Context, r.SiteId, r.Id)
    }).ToArrayAsync();
}

And this function:

public static async Task<bool?> checkIfServicable(DbContext context, int? _siteId, int _regionId)
{
    var t = (from ir in context.Set<InspectionReview>()
             join so in context.Set<SiteObject>() on ir.ObjectId equals so.Id
             where so.SiteRegionId == _regionId && so.SiteId == _siteId
             select (bool?)
             ir.IsNormal);

    return t.Count() == 0 ? (bool?)null : t.Any(x => x.Value == false) ? false : true;
}

On this row:

await RegionBreif.checkIfServicable(Context, r.SiteId, r.Id)

I get this error:

Error 13 The 'await' operator can only be used within an async lambda expression. Consider marking this lambda expression with the 'async' modifier.

Upvotes: 1

Views: 1992

Answers (1)

Christos
Christos

Reputation: 53958

The problem is in the lambda expression you pass to the Select. If you want to make use of the await inside the type create, RegionBreif, you have to pass an async lambda expression as below:

Select(async r => new RegionBreif
{
    IsServiceable = await RegionBreif.checkIfServicable(Context, r.SiteId, r.Id)
})

Upvotes: 3

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