SyntaxFix

[c#] lambda expression for exists within list

I would look at the Join operator:

from r in list join i in listofIds on r.Id equals i select r

I'm not sure how this would be optimized over the Contains methods, but at least it gives the compiler a better idea of what you're trying to do. It's also sematically closer to what you're trying to achieve.

Edit: Extension method syntax for completeness (now that I've figured it out):

var results = listofIds.Join(list, i => i, r => r.Id, (i, r) => r);

Examples related to c#

• How can I convert this one line of ActionScript to C#? • Microsoft Advertising SDK doesn't deliverer ads • How to use a global array in C#? • How to correctly write async method? • C# - insert values from file into two arrays • Uploading into folder in FTP? • Are these methods thread safe? • dotnet ef not found in .NET Core 3 • HTTP Error 500.30 - ANCM In-Process Start Failure • Best way to "push" into C# array

Examples related to linq

• Async await in linq select • How to resolve Value cannot be null. Parameter name: source in linq? • What does Include() do in LINQ? • Selecting multiple columns with linq query and lambda expression • System.Collections.Generic.List does not contain a definition for 'Select' • lambda expression join multiple tables with select and where clause • LINQ select one field from list of DTO objects to array • The model backing the 'ApplicationDbContext' context has changed since the database was created • Check if two lists are equal • Why is this error, 'Sequence contains no elements', happening?

Examples related to lambda

• Java 8 optional: ifPresent return object orElseThrow exception • How to properly apply a lambda function into a pandas data frame column • What are functional interfaces used for in Java 8? • Java 8 lambda get and remove element from list • Variable used in lambda expression should be final or effectively final • Filter values only if not null using lambda in Java8 • forEach loop Java 8 for Map entry set • Java 8 Lambda Stream forEach with multiple statements • Java 8 stream map to list of keys sorted by values • Task.Run with Parameter(s)?