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michaelnebelmichaelnebel
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C#: Add tests for the LINQ missed-where and missed-cast queries.
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‎csharp/ql/test/query-tests/Linq/MissedCastOpportunity/MissedCastOpportunity.cs

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using System;
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using System.Collections;
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using System.Collections.Generic;
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class MissedCastOpportunity
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{
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public void M1(List<Animal> animals)
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{
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// BAD: Can be replaced with animals.Cast<Dog>().
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foreach (Animal a in animals)
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{
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Dog d = (Dog)a;
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d.Woof();
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}
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}
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public void M2(NonEnumerableClass nec)
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{
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// GOOD: Not possible to use Linq here.
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foreach (Animal a in nec)
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{
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Dog d = (Dog)a;
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d.Woof();
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}
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}
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public void M3(Animal[] animals)
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{
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// BAD: Can be replaced with animals.Cast<Dog>().
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foreach (Animal animal in animals)
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{
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Dog d = (Dog)animal;
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d.Woof();
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}
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}
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public void M4(Array animals)
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{
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// BAD: Can be replaced with animals.Cast<Dog>().
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foreach (Animal animal in animals)
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{
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Dog d = (Dog)animal;
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d.Woof();
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}
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}
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public void M5(IEnumerable animals)
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{
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// BAD: Can be replaced with animals.Cast<Dog>().
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foreach (object animal in animals)
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{
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Dog d = (Dog)animal;
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d.Woof();
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}
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}
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public class NonEnumerableClass
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{
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public IEnumerator<Animal> GetEnumerator() => throw null;
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}
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public class Animal { }
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class Dog : Animal
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{
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private string name;
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public Dog(string name)
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{
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this.name = name;
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}
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public void Woof()
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{
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Console.WriteLine("Woof! My name is " + name + ".");
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}
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}
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}

‎csharp/ql/test/query-tests/Linq/MissedCastOpportunity/MissedCastOpportunity.expected

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| MissedCastOpportunity.cs:10:9:14:9 | foreach (... ... in ...) ... | This foreach loop immediately $@ - consider casting the sequence explicitly using '.Cast(...)'. | MissedCastOpportunity.cs:12:13:12:27 | ... ...; | casts its iteration variable to another type |
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| MissedCastOpportunity.cs:30:9:34:9 | foreach (... ... in ...) ... | This foreach loop immediately $@ - consider casting the sequence explicitly using '.Cast(...)'. | MissedCastOpportunity.cs:32:13:32:32 | ... ...; | casts its iteration variable to another type |
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| MissedCastOpportunity.cs:40:9:44:9 | foreach (... ... in ...) ... | This foreach loop immediately $@ - consider casting the sequence explicitly using '.Cast(...)'. | MissedCastOpportunity.cs:42:13:42:32 | ... ...; | casts its iteration variable to another type |
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| MissedCastOpportunity.cs:50:9:54:9 | foreach (... ... in ...) ... | This foreach loop immediately $@ - consider casting the sequence explicitly using '.Cast(...)'. | MissedCastOpportunity.cs:52:13:52:32 | ... ...; | casts its iteration variable to another type |

‎csharp/ql/test/query-tests/Linq/MissedCastOpportunity/MissedCastOpportunity.qlref

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Linq/MissedCastOpportunity.ql

‎csharp/ql/test/query-tests/Linq/MissedCastOpportunity/options

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semmle-extractor-options: /nostdlib /noconfig
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semmle-extractor-options: --load-sources-from-project:${testdir}/../../../resources/stubs/_frameworks/Microsoft.NETCore.App/Microsoft.NETCore.App.csproj

‎csharp/ql/test/query-tests/Linq/MissedWhereOpportunity/MissedWhereOpportunity.cs

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using System;
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using System.Linq;
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using System.Collections.Generic;
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class MissedWhereOpportunity
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{
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public void M1(List<int> lst)
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{
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// BAD: Can be replaced with lst.Where(e => e % 2 == 0)
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foreach (int i in lst)
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{
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if (i % 2 != 0)
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continue;
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Console.WriteLine(i);
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Console.WriteLine((i / 2));
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}
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// BAD: Can be replaced with lst.Where(e => e % 2 == 0)
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foreach (int i in lst)
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{
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if (i % 2 == 0)
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{
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Console.WriteLine(i);
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Console.WriteLine((i / 2));
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}
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}
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}
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public void M2(NonEnumerableClass nec)
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{
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// GOOD: Linq can't be used here.
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foreach (int i in nec)
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{
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if (i % 2 == 0)
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{
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Console.WriteLine(i);
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Console.WriteLine((i / 2));
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}
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}
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}
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public void M3(int[] arr)
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{
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// BAD: Can be replaced with arr.Where(e => e % 2 == 0)
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foreach (var n in arr)
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{
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if (n % 2 == 0)
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{
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Console.WriteLine(n);
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Console.WriteLine((n / 2));
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}
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}
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}
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public void M4(Array arr)
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{
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// GOOD: Linq can't be used here.
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foreach (var element in arr)
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{
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if (element.GetHashCode() % 2 == 0)
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{
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Console.WriteLine(element);
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}
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}
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}
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public void M5(IEnumerable<int> elements)
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{
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// BAD: Can be replaced with elements.Where(e => e.GetHashCode() % 2 == 0)
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foreach (var element in elements)
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{
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if (element.GetHashCode() % 2 == 0)
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{
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Console.WriteLine(element);
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}
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}
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}
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public class NonEnumerableClass
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{
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public IEnumerator<int> GetEnumerator() => throw null;
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}
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}

‎csharp/ql/test/query-tests/Linq/MissedWhereOpportunity/MissedWhereOpportunity.expected

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| MissedWhereOpportunity.cs:10:9:16:9 | foreach (... ... in ...) ... | This foreach loop $@ - consider filtering the sequence explicitly using '.Where(...)'. | MissedWhereOpportunity.cs:12:17:12:26 | ... != ... | implicitly filters its target sequence |
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| MissedWhereOpportunity.cs:19:9:26:9 | foreach (... ... in ...) ... | This foreach loop $@ - consider filtering the sequence explicitly using '.Where(...)'. | MissedWhereOpportunity.cs:21:17:21:26 | ... == ... | implicitly filters its target sequence |
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| MissedWhereOpportunity.cs:45:9:52:9 | foreach (... ... in ...) ... | This foreach loop $@ - consider filtering the sequence explicitly using '.Where(...)'. | MissedWhereOpportunity.cs:47:17:47:26 | ... == ... | implicitly filters its target sequence |
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| MissedWhereOpportunity.cs:70:9:76:9 | foreach (... ... in ...) ... | This foreach loop $@ - consider filtering the sequence explicitly using '.Where(...)'. | MissedWhereOpportunity.cs:72:17:72:46 | ... == ... | implicitly filters its target sequence |

‎csharp/ql/test/query-tests/Linq/MissedWhereOpportunity/MissedWhereOpportunity.qlref

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Linq/MissedWhereOpportunity.ql

‎csharp/ql/test/query-tests/Linq/MissedWhereOpportunity/options

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semmle-extractor-options: /nostdlib /noconfig
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semmle-extractor-options: --load-sources-from-project:${testdir}/../../../resources/stubs/_frameworks/Microsoft.NETCore.App/Microsoft.NETCore.App.csproj

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