Support for renaming parameters of anonymous methods and lambda expressions.

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp/Resolver/FindReferences.cs

@@ -1560,6 +1560,9 @@ namespace ICSharpCode.NRefactory.CSharp.Resolver
 					return new FindParameterReferencesNavigator (parameter);
 				}
 			);
+			if (parameter.Owner == null) {
+				scope.fileName = parameter.Region.FileName;
+			}
 			return scope;
 		}
 

src/Main/Base/Project/Src/Editor/Commands/FindReferencesCommand.cs

@@ -80,7 +80,11 @@ namespace ICSharpCode.SharpDevelop.Editor.Commands
 				case SymbolKind.Variable:
 					return SD.ProjectService.FindProjectContainingFile(new FileName(((IVariable)symbol).Region.FileName));
 				case SymbolKind.Parameter:
-					return ((IParameter)symbol).Owner.ParentAssembly.GetProject();
+					if (((IParameter) symbol).Owner != null) {
+						return ((IParameter)symbol).Owner.ParentAssembly.GetProject();
+					} else {
+						return SD.ProjectService.FindProjectContainingFile(new FileName(((IParameter)symbol).Region.FileName));
+					}
 				case SymbolKind.TypeParameter:
 					return null; // TODO : extend rename on type parameters
 				default: