public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
{
SyntaxNode root = await context.GetSyntaxRootAsync().ConfigureAwait(false);
if (!TryFindFirstAncestorOrSelf(root, context.Span, out ExpressionSyntax expression))
{
return;
}
Document document = context.Document;
foreach (Diagnostic diagnostic in context.Diagnostics)
{
switch (diagnostic.Id)
{
case DiagnosticIdentifiers.ExpressionIsAlwaysEqualToTrueOrFalse:
{
if (expression.IsKind(
SyntaxKind.LessThanExpression,
SyntaxKind.LessThanOrEqualExpression,
SyntaxKind.GreaterThanExpression,
SyntaxKind.GreaterThanOrEqualExpression))
{
var binaryExpression = (BinaryExpressionSyntax)expression;
LiteralExpressionSyntax newNode = CSharpFactory.BooleanLiteralExpression(binaryExpression.IsKind(SyntaxKind.GreaterThanOrEqualExpression, SyntaxKind.LessThanOrEqualExpression));
CodeAction codeAction = CodeAction.Create(
$"Replace expression with '{newNode}'",
ct => document.ReplaceNodeAsync(binaryExpression, newNode.WithTriviaFrom(binaryExpression), ct),
GetEquivalenceKey(diagnostic));
context.RegisterCodeFix(codeAction, diagnostic);
}
else
{
CodeAction codeAction = CodeAction.Create(
"Remove null check",
ct => RemoveUnnecessaryNullCheckAsync(document, expression, ct),
GetEquivalenceKey(diagnostic));
context.RegisterCodeFix(codeAction, diagnostic);
}
break;
}
}
}
}
