Roslyn - replace node and fix the whitespaces

Question

In my program I use Roslyn and I need to replace a node with a new node. For example, if I have code like

public void Foo()
{
   for(var i = 0; i < 5; i++         


        

Answer 1

You need to use .WithAdditionalAnnotations(Formatter.Annotation), but only on the specific element you want to format. Here's an example from the NullParameterCheckRefactoring project.

IfStatementSyntax nullCheckIfStatement = SyntaxFactory.IfStatement(
    SyntaxFactory.Token(SyntaxKind.IfKeyword),
    SyntaxFactory.Token(SyntaxKind.OpenParenToken),
    binaryExpression, 
    SyntaxFactory.Token(SyntaxKind.CloseParenToken), 
    syntaxBlock, null).WithAdditionalAnnotations(Formatter.Annotation, Simplifier.Annotation);