Merge pull request #46059 from akhera99/single-overload

Single overload - Inline Parameter Name Hints

src/EditorFeatures/Test2/InlineParameterNameHints/CSharpInlineParameterNameHintsTests.vb

@@ -305,6 +305,30 @@ class Foo
 {
         
 
+}
+                    </Document>
+                </Project>
+            </Workspace>
+
+            Await VerifyParamHints(input)
+        End Function
+
+        <WpfFact, Trait(Traits.Feature, Traits.Features.InlineParameterNameHints)>
+        Public Async Function TestIncompleteFunctionCall() As Task
+            Dim input =
+            <Workspace>
+                <Project Language="C#" CommonReferences="true">
+                    <Document>
+class A
+{
+    int testMethod(int x, object y)
+    {
+        return x;
+    }
+    void Main() 
+    {
+        testMethod({|x:-(int)5.5|},);
+    }
 }
                     </Document>
                 </Project>

src/EditorFeatures/Test2/InlineParameterNameHints/VisualBasicInlineParameterNameHintsTests.vb

@@ -308,5 +308,27 @@ Namespace Microsoft.CodeAnalysis.Editor.UnitTests.InlineParameterNameHints
 
             Await VerifyParamHints(input)
         End Function
+
+        <WpfFact, Trait(Traits.Feature, Traits.Features.InlineParameterNameHints)>
+        Public Async Function TestIncompleteFunctionCall() As Task
+            Dim input =
+            <Workspace>
+                <Project Language="Visual Basic" CommonReferences="true">
+                    <Document>
+                        Class Foo
+                            Sub Main(args As String())
+                                TestMethod({|x:5|},)
+                            End Sub
+
+                            Sub TestMethod(x As Integer, y As Double)
+
+                            End Sub
+                        End Class
+                    </Document>
+                </Project>
+            </Workspace>
+
+            Await VerifyParamHints(input)
+        End Function
     End Class
 End Namespace

src/Workspaces/SharedUtilitiesAndExtensions/Compiler/CSharp/Extensions/ArgumentSyntaxExtensions.cs

@@ -59,7 +59,14 @@ public static RefKind GetRefKind(this ArgumentSyntax argument)
                 return null;
             }
 
-            var symbol = semanticModel.GetSymbolInfo(invocableExpression, cancellationToken).Symbol;
+            // Get the symbol as long if it's not null or if there is only one candidate symbol
+            var symbolInfo = semanticModel.GetSymbolInfo(invocableExpression, cancellationToken);
+            var symbol = symbolInfo.Symbol;
+            if (symbol == null && symbolInfo.CandidateSymbols.Length == 1)
+            {
+                symbol = symbolInfo.CandidateSymbols[0];
+            }
+
             if (symbol == null)
             {
                 return null;

src/Workspaces/SharedUtilitiesAndExtensions/Compiler/VisualBasic/Extensions/ArgumentSyntaxExtensions.vb

@@ -31,7 +31,14 @@ Namespace Microsoft.CodeAnalysis.VisualBasic.Extensions
                 Return Nothing
             End If
 
-            Dim symbol = semanticModel.GetSymbolInfo(argumentList.Parent, cancellationToken).Symbol
+            ' Get the symbol if it is not Nothing or if there is a singular candidate symbol
+            Dim symbolInfo = semanticModel.GetSymbolInfo(argumentList.Parent, cancellationToken)
+            Dim symbol = symbolInfo.Symbol
+
+            If symbol Is Nothing AndAlso symbolInfo.CandidateSymbols.Length = 1 Then
+                symbol = symbolInfo.CandidateSymbols.Item(0)
+            End If
+
             If symbol Is Nothing Then
                 Return Nothing
             End If