void AddFormatCallToInvocation (RefactoringContext context, Script script, PrimitiveExpression pExpr, InvocationExpression invocation)
{
var newInvocation = (InvocationExpression)invocation.Clone ();
newInvocation.Arguments.First ().ReplaceWith (CreateFormatString (context, pExpr, newInvocation.Arguments.Count () - 1));
newInvocation.Arguments.Add (CreateFormatArgument (context));
script.Replace (invocation, newInvocation);
}
void AddArgument(Script script, InvocationExpression invocationExpression, string stringComparison)
{
var astBuilder = ctx.CreateTypeSytemAstBuilder(invocationExpression);
var newArgument = astBuilder.ConvertType(new TopLevelTypeName("System", "StringComparison")).Member(stringComparison);
var copy = (InvocationExpression)invocationExpression.Clone();
copy.Arguments.Add(newArgument);
script.Replace(invocationExpression, copy);
}