Introduce constant action can now replace more than one occurence

(like declare local variable action).

ICSharpCode.NRefactory.CSharp/Refactoring/CodeActions/DeclareLocalVariableAction.cs

@@ -142,7 +142,7 @@ namespace ICSharpCode.NRefactory.CSharp.Refactoring
 		}
 
 				
-		class SearchNodeVisitior : DepthFirstAstVisitor
+		internal class SearchNodeVisitior : DepthFirstAstVisitor
 		{
 			readonly AstNode searchForNode;
 			public readonly List<AstNode> Matches = new List<AstNode> ();

ICSharpCode.NRefactory.CSharp/Refactoring/CodeActions/IntroduceConstantAction.cs

@@ -43,6 +43,12 @@ namespace ICSharpCode.NRefactory.CSharp.Refactoring
 				yield break;
 			}
 
+			var visitor = new DeclareLocalVariableAction.SearchNodeVisitior(pexpr);
+			
+			var node = context.GetNode <BlockStatement>();
+			if (node != null)
+				node.AcceptVisitor(visitor);
+
 			var resolveResult = context.Resolve(pexpr);
 
 			yield return new CodeAction(context.TranslateString("Create local constant"), script => {
@@ -83,6 +89,57 @@ namespace ICSharpCode.NRefactory.CSharp.Refactoring
 				//				script.Link(initializer.NameToken, variableUsage);
 				script.InsertWithCursor(context.TranslateString("Create constant"), Script.InsertPosition.Before, decl);
 			});
+
+			if (visitor.Matches.Count > 1) {
+				yield return new CodeAction(string.Format(context.TranslateString("Create local constant (replace '{0}' occurrences)"), visitor.Matches.Count), script => {
+					string name = CreateMethodDeclarationAction.CreateBaseName(pexpr, resolveResult.Type);
+					var service = (NamingConventionService)context.GetService(typeof(NamingConventionService));
+					if (service != null)
+						name = service.CheckName(context, name, AffectedEntity.LocalConstant);
+					
+					var initializer = new VariableInitializer(name, pexpr.Clone());
+					var decl = new VariableDeclarationStatement() {
+						Type = context.CreateShortType(resolveResult.Type),
+						Modifiers = Modifiers.Const,
+						Variables = { initializer }
+					};
+					
+					script.InsertBefore(statement, decl);
+
+					var linkedNodes = new List<AstNode>();
+					linkedNodes.Add(initializer.NameToken);
+					for (int i = 0; i < visitor.Matches.Count; i++) {
+						var identifierExpression = new IdentifierExpression(name);
+						linkedNodes.Add(identifierExpression);
+						script.Replace(visitor.Matches [i], identifierExpression);
+					}
+					script.Link(linkedNodes.ToArray ());
+				});
+				
+				yield return new CodeAction(string.Format(context.TranslateString("Create constant field (replace '{0}' occurrences)"), visitor.Matches.Count), script => {
+					string name = CreateMethodDeclarationAction.CreateBaseName(pexpr, resolveResult.Type);
+					var service = (NamingConventionService)context.GetService(typeof(NamingConventionService));
+					if (service != null)
+						name = service.CheckName(context, name, AffectedEntity.ConstantField);
+					
+					var initializer = new VariableInitializer(name, pexpr.Clone());
+					
+					var decl = new FieldDeclaration() {
+						ReturnType = context.CreateShortType(resolveResult.Type),
+						Modifiers = Modifiers.Const,
+						Variables = { initializer }
+					};
+					
+					var linkedNodes = new List<AstNode>();
+					linkedNodes.Add(initializer.NameToken);
+					for (int i = 0; i < visitor.Matches.Count; i++) {
+						var identifierExpression = new IdentifierExpression(name);
+						linkedNodes.Add(identifierExpression);
+						script.Replace(visitor.Matches [i], identifierExpression);
+					}
+					script.InsertWithCursor(context.TranslateString("Create constant"), Script.InsertPosition.Before, decl);
+				});
+			}
 		}
 	}
 }

ICSharpCode.NRefactory.Tests/CSharp/CodeActions/IntroduceConstantTests.cs

@@ -89,5 +89,29 @@ namespace ICSharpCode.NRefactory.CSharp.CodeActions
 	}
 }", 1);
 		}
+
+
+		[Test()]
+		public void TestLocalConstantReplaceAll ()
+		{
+			Test<IntroduceConstantAction> (@"class TestClass
+{
+	public void Hello ()
+	{
+		System.Console.WriteLine ($""Hello World"");
+		System.Console.WriteLine (""Hello World"");
+		System.Console.WriteLine (""Hello World"");
+	}
+}", @"class TestClass
+{
+	public void Hello ()
+	{
+		const string helloWorld = ""Hello World"";
+		System.Console.WriteLine (helloWorld);
+		System.Console.WriteLine (helloWorld);
+		System.Console.WriteLine (helloWorld);
+	}
+}", 2);
+		}
 	}
 }