Rename multiple variables in 1 click

Question

I've made a CodeFix who rename a variable if its name doesn't correspond to some laws. By exemple, "int" variable need to begin with an "i". I've made this CodeFix and it works:

public async Task<IEnumerable<CodeAction>> GetFixesAsync(Document document, TextSpan 
span, IEnumerable<Diagnostic> diagnostics, CancellationToken cancellationToken)
{
  var root = await document.GetSyntaxRootAsync(cancellationToken); 
  var token = root.FindToken(span.Start); 
  var node = root.FindNode(span);

  if (node.IsKind(SyntaxKind.VariableDeclarator))
  {
     if (node.Parent.Parent is LocalDeclarationStatementSyntax)
     {
       var Verify = (LocalDeclarationStatementSyntax)node.Parent.Parent;
       var Verify2 = (VariableDeclarationSyntax)node.Parent;
       if (!Verify.Modifiers.Any(SyntaxKind.ConstKeyword))
       {
          if (Verify2.Type.ToString() == "int")
          {
            if (token.IsKind(SyntaxKind.IdentifierToken))
            {
                var variable = (VariableDeclaratorSyntax)node;
                string newName = variable.Identifier.ValueText;
                if (newName.Length > 1)
                {
                  newName = char.ToUpper(newName[0]) + newName.Substring(1);
                }
                var leading = variable.Identifier.LeadingTrivia;
                var trailing = variable.Identifier.TrailingTrivia;

                VariableDeclaratorSyntax newVariable = variable.WithIdentifier(SyntaxFactory.Identifier(leading, "i" + newName, trailing));
                var newRoot = root.ReplaceNode(variable, newVariable);
                return new[] { CodeAction.Create("Add 'i'", document.WithSyntaxRoot(newRoot)) };

                 }
               }
          }
      }
  }

   return null;
 }

So, if I have a code like this one:

int variable = 0;
variable++;

I have a warning and a way to rename the declaration in one click. So the code change like that:

 int iVariable = 0;
 variable++;

But all the variable who had the name "variable" are not renamed! Visual Studio already have a CodeFix to rename the others variables who were called "variable", but it requires a second operation for the user.

Do you know how a code that I can implement who will rename all the variables directly? If not, is there a way to call the CodeFix that Visual Studio offer?

Answer 1

You're looking for Roslyn's semantic rename engine.

Call Renamer.RenameSymbolAsync().