CodeQL library for C#

codeql/csharp-all 5.4.6-dev (changelog, source)

Module Helpers

Helpers.qll Provides helper classes and methods related to LINQ.

Import path

import Linq.Helpers

Predicates

isEnumerableType	Holds if the type’s qualified name is “System.Linq.Enumerable”
isIEnumerableType	Holds if the type’s qualified name starts with “System.Collections.Generic.IEnumerable”
missedAllOpportunity	Holds if `foreach` statement `fes` could be converted to a `.All()` call. That is, the `ForeachStmt` contains a single `if` with a condition that accesses the loop variable and with a body that assigns `false` to a variable and `break`s out of the `foreach`.
missedCastOpportunity	Holds if the `foreach` statement `fes` can be converted to a `.Cast()` call. That is, the loop variable is accessed only in the first statement of the block, the access is a cast, and the first statement is a local variable declaration statement `s`.
missedOfTypeOpportunity	Holds if `foreach` statement `fes` can be converted to an `.OfType()` call. That is, the loop variable is accessed only in the first statement of the block, the access is a cast with the `as` operator, and the first statement is a local variable declaration statement `s`.
missedSelectOpportunity	Holds if `foreach` statement `fes` can be converted to a `.Select()` call. That is, the loop variable is accessed only in the first statement of the block, the access is not a cast, and the first statement is a local variable declaration statement `s`.
missedWhereOpportunity	Holds if `foreach` statement `fes` could be converted to a `.Where()` call. That is, first statement of the loop is an `if`, which accesses the loop variable, and the body of the `if` is either a `continue` or there’s nothing else in the loop than the `if`.

Classes

AnyCall	A LINQ Any(…) call.
CountCall	A LINQ Count(…) call.
ForeachStmtEnumerable	A class of foreach statements where the iterable expression supports the use of the LINQ extension methods on `IEnumerable`.
ForeachStmtGenericEnumerable	A class of foreach statements where the iterable expression supports the use of the LINQ extension methods on `IEnumerable<T>`.
IEnumerableSequence	A variable of type IEnumerable<T>, for some T.
SelectCall	A LINQ Select(…) call.