Can a LINQ query return null?
LINQ queries should never return null and you should not get an exception if the result is empty. You probably have an error in your code. It looks like the code you posted is missing the table name.
Can ToList return null?
If you have a Query that returns a empty set then ToList returns null. You would probably expect it to return an empty list (Count = 0), which is the case when using data providers for SQL Server.
What does LINQ where return if not found?
It will return an empty enumerable.
How do you check LINQ result is empty?
Re: Check if linq result is null. if(model. Any()) – will tell you if the query returns any data.
Can IEnumerable where return null?
5 Answers. You do not need to check if selectedRows is null . The returned IEnumerable<> might be empty, but it will never be null .
How do I check if my IEnumerable is empty?
“check if ienumerable is empty c#” Code Answer
- IEnumerable enumerable = new List();
- if(! enumerable. Any())
- {
- throw new InvalidOperationException();
- }
Is null in LINQ C#?
LINQ to SQL does not impose C# null or Visual Basic nothing comparison semantics on SQL. Comparison operators are syntactically translated to their SQL equivalents. The semantics reflect SQL semantics as defined by server or connection settings.
Does first return null?
The major difference between First and FirstOrDefault is that First() will throw an exception if there is no result data for the supplied criteria whereas FirstOrDefault() will return the default value (null) if there is no result data. First() will throw an exception if there is no result data, as you can see below.
Is null in Linq C#?
Is null in LINQ?
What is DefaultIfEmpty in LINQ?
The DefaultIfEmpty operator is used to replace an empty collection or sequence with a default valued singleton collection or sequence. Or in other words, it returns a collection or sequence with default values if the source is empty, otherwise return the source.
Can IEnumerable be null?
The returned IEnumerable<> might be empty, but it will never be null .
What does LINQ return when the results are empty?
What does LINQ return when the results are empty Ask Question Asked12 years, 1 month ago Active4 months ago Viewed208k times 352 38 I have a question about LINQ query. Normally a query returns a IEnumerable type. If the return is empty, not sure if it is null or not.
How does the Findall method in list < t > work?
The elements of the current List are individually passed to the Predicate delegate, and the elements that match the conditions are saved in the returned List . This method performs a linear search; therefore, this method is an O ( n) operation, where n is Count.
What does TryGetValue ( ) in LINQ return?
Returns a boolean which indicates if the object exists and places the object (if present) in an out parameter. Advantages: This pattern is already known from say Dictionary.TryGetValue () so readers will not be confused.
How is the filllist method used in LINQ?
The FillList method in the example uses LINQ to XML to parse the values from the XML to property values of the book objects. The following table describes the examples provided for the find methods.