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codeql/csharp/ql/examples/snippets/null_argument.ql

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/**
* @id cs/examples/null-argument
* @name Add null to collection
* @description Finds places where we add 'null' to a collection.
* @tags null
* parameter
* argument
* collection
* add
*/
import csharp
from MethodCall call, Method add
where
call.getTarget() = add.getAnUltimateImplementor*() and
add.hasName("Add") and
add.getDeclaringType()
.getUnboundDeclaration()
.hasQualifiedName("System.Collections.Generic", "ICollection<>") and
call.getAnArgument() instanceof NullLiteral
select call