Remove LINQ from generated code

CHANGELOG.md

@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 
 - TypeScript imports are now using ES6 imports with the .js extension.
+- Remove LINQ usage in generated code.
 
 ## [1.15.0] - 2024-06-06
 

it/csharp/dotnet.csproj

@@ -21,4 +21,4 @@
     <Compile Remove="basic\**" />
   </ItemGroup>
 
-</Project>
+</Project>

src/Kiota.Builder/Refiners/CSharpRefiner.cs

@@ -171,7 +171,7 @@ protected static void MakeEnumPropertiesNullable(CodeElement currentElement)
         new (static x => x is CodeClass @class && @class.IsOfKind(CodeClassKind.RequestBuilder),
             "System.Threading.Tasks", "Task"),
         new (static x => x is CodeClass @class && @class.IsOfKind(CodeClassKind.Model, CodeClassKind.RequestBuilder),
-            "System.Linq", "Enumerable"),
+            ExtensionsNamespaceName, "Enumerable"),
         new (static x => x is CodeMethod method && method.IsOfKind(CodeMethodKind.ClientConstructor) &&
                     method.Parameters.Any(y => y.IsOfKind(CodeParameterKind.BackingStore)),
             StoreNamespaceName,  "IBackingStoreFactory", "IBackingStoreFactorySingleton"),

src/Kiota.Builder/Writers/CSharp/CodeMethodWriter.cs

@@ -10,8 +10,8 @@ public class CodeMethodWriter : BaseElementWriter<CodeMethod, CSharpConventionSe
 {
     public CodeMethodWriter(CSharpConventionService conventionService) : base(conventionService)
     {
-
     }
+
     public override void WriteCodeElement(CodeMethod codeElement, LanguageWriter writer)
     {
         ArgumentNullException.ThrowIfNull(codeElement);
@@ -350,7 +350,7 @@ private string GetDeserializationMethodName(CodeTypeBase propType, CodeMethod me
         {
             if (isCollection)
             {
-                var collectionMethod = propType.IsArray ? "?.ToArray()" : "?.ToList()";
+                var collectionMethod = propType.IsArray ? "?.AsArray()" : "?.AsList()";
                 if (currentType.TypeDefinition == null)
                     return $"GetCollectionOfPrimitiveValues<{propertyType}>(){collectionMethod}";
                 else if (currentType.TypeDefinition is CodeEnum)
@@ -407,7 +407,7 @@ protected void WriteRequestExecutorBody(CodeMethod codeElement, RequestParams re
         };
         writer.WriteLine($"{prefix}await RequestAdapter.{GetSendRequestMethodName(isVoid, codeElement, codeElement.ReturnType)}(requestInfo{returnTypeFactory}, {errorMappingVarName}, cancellationToken).ConfigureAwait(false);");
         if (codeElement.ReturnType.IsCollection)
-            writer.WriteLine("return collectionResult?.ToList();");
+            writer.WriteLine("return collectionResult?.AsList();");
     }
     private const string RequestInfoVarName = "requestInfo";
     private void WriteRequestGeneratorBody(CodeMethod codeElement, RequestParams requestParams, CodeClass currentClass, LanguageWriter writer)

tests/Kiota.Builder.Tests/Writers/CSharp/CodeMethodWriterTests.cs

@@ -542,7 +542,7 @@ public void WritesRequestExecutorBodyForCollection()
         Assert.Contains("var errorMapping = new Dictionary<string, ParsableFactory<IParsable>>", result);
         Assert.Contains("{ \"4XX\", Error4XX.CreateFromDiscriminatorValue },", result);
         Assert.Contains("SendCollectionAsync", result);
-        Assert.Contains("return collectionResult?.ToList()", result);
+        Assert.Contains("return collectionResult?.AsList()", result);
         Assert.Contains($"{ReturnTypeName}.CreateFromDiscriminatorValue", result);
         AssertExtensions.CurlyBracesAreClosed(result, 1);
     }
@@ -592,7 +592,7 @@ public void WritesModelFactoryBodyForUnionModels()
         Assert.Contains("ComplexType1Value = new ComplexType1()", result);
         Assert.Contains("else if(parseNode.GetStringValue() is string stringValueValue)", result);
         Assert.Contains("StringValue = stringValueValue", result);
-        Assert.Contains("parseNode.GetCollectionOfObjectValues<ComplexType2>(ComplexType2.CreateFromDiscriminatorValue)?.ToList() is List<ComplexType2> complexType2ValueValue", result);
+        Assert.Contains("parseNode.GetCollectionOfObjectValues<ComplexType2>(ComplexType2.CreateFromDiscriminatorValue)?.AsList() is List<ComplexType2> complexType2ValueValue", result);
         Assert.Contains("ComplexType2Value = complexType2ValueValue", result);
         Assert.Contains("return result", result);
         AssertExtensions.Before("GetStringValue() is string stringValueValue", "GetCollectionOfObjectValues<ComplexType2>", result);
@@ -631,7 +631,7 @@ public void WritesModelFactoryBodyForIntersectionModels()
         Assert.DoesNotContain("if(\"#kiota.complexType1\".Equals(mappingValue, StringComparison.OrdinalIgnoreCase))", result);
         Assert.Contains("if(parseNode.GetStringValue() is string stringValueValue)", result);
         Assert.Contains("StringValue = stringValueValue", result);
-        Assert.Contains("parseNode.GetCollectionOfObjectValues<ComplexType2>(ComplexType2.CreateFromDiscriminatorValue)?.ToList() is List<ComplexType2> complexType2ValueValue", result);
+        Assert.Contains("parseNode.GetCollectionOfObjectValues<ComplexType2>(ComplexType2.CreateFromDiscriminatorValue)?.AsList() is List<ComplexType2> complexType2ValueValue", result);
         Assert.Contains("ComplexType2Value = complexType2ValueValue", result);
         Assert.Contains("ComplexType1Value = new ComplexType1()", result);
         Assert.Contains("return result", result);