Fix S3878 AD0001: Cover the case of CollectionInitializerSyntax for VB.NET (#9464)

Author: mary-georgiou-sonarsource

analyzers/src/SonarAnalyzer.VisualBasic/Rules/ArrayPassedAsParams.cs

@@ -39,7 +39,12 @@ protected override ArgumentSyntax LastArgumentIfArrayCreation(SyntaxNode express
             : null;
 
     protected override ITypeSymbol ArrayElementType(ArgumentSyntax argument, SemanticModel model) =>
-        model.GetTypeInfo(((ArrayCreationExpressionSyntax)argument.GetExpression()).Type).Type;
+        argument.GetExpression() switch
+        {
+            ArrayCreationExpressionSyntax arrayCreation => model.GetTypeInfo(arrayCreation.Type).Type,
+            CollectionInitializerSyntax collectionInitializer => (model.GetTypeInfo(collectionInitializer).Type as IArrayTypeSymbol)?.ElementType,
+            _ => null
+        };
 
     private static ArgumentListSyntax ArgumentList(SyntaxNode expression) =>
         expression switch

analyzers/tests/SonarAnalyzer.Test/TestCases/ArrayPassedAsParams.vb

@@ -82,12 +82,14 @@ Public Class Repro6894
                                                                         ' The argument given for a parameter array can be a single expression that is implicitly convertible (§10.2) to the parameter array type.
                                                                         ' In this case, the parameter array acts precisely like a value parameter.
                                                                         ' see: https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/language-specification/classes#14625-parameter-arrays
+        Method({"1", "2"})                                              ' FN
         Method(New Object() {New Integer() {1, 2}})                     ' FN, elements in args: [System.Int32[]]
         Method(New Integer() {1, 2, 3})                                 ' Compliant, Elements in args: [System.Int32[]]
         Method(New String() {"1", "2"}, New String() {"1", "2"})        ' Compliant, elements in args: [System.String[], System.String[]]
         Method(New String() {"1", "2"}, New Integer() {1, 2})           ' Compliant, elements in args: [System.String[], System.Int32[]]
         MethodArray(New String() {"1", "2"}, New String() {"1", "2"})   ' Compliant, elements in args: [System.String[], System.String[]]
         MethodArray(New Integer() {1, 2}, New Integer() {1, 2})         ' Compliant, elements in args: [System.Int32[], System.Int32[]]
+        MethodArray({1, 2}, {1, 2})                                     ' Compliant, elements in args: [System.Int32[], System.Int32[]]
 
         MethodJaggedArray(New Integer() {1, 2})                         ' Compliant: jagged array [System.Object[]]
     End Sub