impl

src/Analyzers/CSharp/Analysis/OptimizeLinqMethodCallAnalysis.cs

@@ -718,6 +718,14 @@ public static void AnalyzeOrderByIdentity(SyntaxNodeAnalysisContext context, in
         if (lambdaExpression.Body is not IdentifierNameSyntax identifier || identifier.Identifier.Text != lambdaExpression.Parameter.Identifier.Text)
             return;
 
+        if (context.SemanticModel
+            .GetTypeSymbol(invocationInfo.Expression, context.CancellationToken)?
+            .OriginalDefinition
+            .HasMetadataName(MetadataNames.System_Linq_IQueryable_T) == true)
+        {
+            return;
+        }
+
         TextSpan span = TextSpan.FromBounds(invocationInfo.Name.SpanStart, invocationExpression.Span.End);
         Report(context, invocationExpression, span, checkDirectives: true);
     }

src/Tests/Analyzers.Tests/RCS1077OptimizeLinqMethodCallTests.cs

@@ -1562,4 +1562,22 @@ void M()
 }
 ");
     }
+
+    [Fact, Trait(Traits.Analyzer, DiagnosticIdentifiers.OptimizeLinqMethodCall)]
+    public async Task TestNoDiagnostic_OrderByToOrder_IQueryable()
+    {
+        await VerifyNoDiagnosticAsync(@"
+using System.Linq;
+
+class C
+{
+    void M()
+    {
+        IQueryable<string> q = null;
+        var x = q.OrderBy(f => f);
+    }
+}
+");
+    }
+
 }