WebOct 25, 2013 · The only way to determine if the query has at least one result is to actually execute the query. You don't need to iterate the entire result set, but you need to try to … WebThe First and FirstOrDefault methods can be used directly on a IQueryable or IQueryable like this: var first = context.Customers.First ( "c => c.City == \"Paris\"" ); var firstOrDefault = context.Customers.FirstOrDefault ( "c => c.City == \"Otherworld\"" ); Or you can use this inside a Dynamic LINQ query:
.NET 6 LINQ Improvements - InfoQ
WebIf the boolean condition/value is false, you simply pass back the IQueryable (assuming this is EF, but could be wrong). Otherwise, call Where using your action, and return the IQueryable. You can then continue to chain your queries. 1 More posts you may like r/vba Join • 3 yr. ago Check if string is in array 3 8 redditads Promoted WebOct 14, 2024 · DbSet and IDbSet implement IQueryable and so can be used as the starting point for writing a LINQ query against the database. This is not the appropriate place for an in-depth discussion of LINQ, but here are a couple of simple examples: ... If a query returns no rows from the database, the result will be an empty collection, rather than null ... nothing in the rear view but wasted time
LINQ Contains Method in C# with Examples - Dot Net Tutorials
WebNov 21, 2016 · Solution 2 The new ?? operator is available for this type of operation. If the value on the left is null, it will return the value on the right. There is also a similar ?. operator, which does not call the property on the right if the value on … WebJul 6, 2024 · private IQueryable Filter (FiterVM filter) => All () .WhereIf (!string.IsNullOrEmpty (filter.Voornaam), x => x.FirstName.ToLower ().StartsWith (filter.Voornaam.ToLower ().Trim ()) .WhereIf (!string.IsNullOrEmpty (filter.Achternaam), x => x.LastName.ToLower ().StartsWith (filter.Achternaam.ToLower ().Trim ()) .WhereIf … WebFeb 7, 2013 · I want to check if a field is empty. How do I do? I want to use below case. case when (isempty (max (o.created_at)),'null',max (o.created_at)) as last_order_date, If … nothing in this agreement 意味