public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
{
var root = await context.Document.GetSyntaxRootAsync(context.CancellationToken).ConfigureAwait(false);
var diagnostic = context.Diagnostics.First();
var diagnosticSpan = diagnostic.Location.SourceSpan;
// find the 'new XError()' expression
var creationExpr = root.FindToken(diagnosticSpan.Start).Parent.AncestorsAndSelf().OfType <ObjectCreationExpressionSyntax>().First();
var semanticModel = await context.Document.GetSemanticModelAsync(context.CancellationToken);
if (ErrorExceptionUsageAnalyzer.TryMatchLiteralCreation(creationExpr, semanticModel, out var literalCreation))
{
// Register a code action that will invoke the fix.
foreach (var sev in Severities)
{
context.RegisterCodeFix(
CodeAction.Create(
title: string.Format(Title, sev),
createChangedSolution: c => ConvertMessagesToConstantsAsync(context.Document, new[] { literalCreation }, sev, c),
equivalenceKey: string.Format(Title, sev)),
diagnostic);
}
}
}
static IEnumerable <LiteralCreation> MatchLiteralCreations(
[NotNull] IEnumerable <ObjectCreationExpressionSyntax> creationExprs, SemanticModel semanticModel)
{
foreach (var expr in creationExprs)
{
if (ErrorExceptionUsageAnalyzer.TryMatchLiteralCreation(expr, semanticModel, out var literalCreation))
{
yield return(literalCreation);
}
}
}