public static async Task <Document> RefactorAsync(
Document document,
UsingStatementSyntax usingStatement,
ExpressionSyntax expression,
CancellationToken cancellationToken)
{
SemanticModel semanticModel = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
string name = NameGenerator.Default.EnsureUniqueLocalName(DefaultNames.Variable, semanticModel, expression.SpanStart);
VariableDeclarationSyntax declaration = VariableDeclaration(
VarType(),
Identifier(name).WithRenameAnnotation(),
EqualsValueClause(expression.WithoutTrivia()));
declaration = declaration
.WithTriviaFrom(expression)
.WithFormatterAnnotation();
UsingStatementSyntax newNode = usingStatement
.WithExpression(null)
.WithDeclaration(declaration);
return(await document.ReplaceNodeAsync(usingStatement, newNode, cancellationToken).ConfigureAwait(false));
}