public async override Task RegisterCodeFixesAsync(CodeFixContext context)
{
var document = context.Document;
var cancellationToken = context.CancellationToken;
var span = context.Span;
var diagnostics = context.Diagnostics;
var root = await document.GetSyntaxRootAsync(cancellationToken);
var semanticModel = await document.GetSemanticModelAsync(cancellationToken);
var diagnostic = diagnostics.First();
var node = root.FindNode(context.Span) as IfStatementSyntax;
var switchExpr = ConvertIfStatementToSwitchStatementCodeRefactoringProvider.GetSwitchExpression(semanticModel, node.Condition);
if (switchExpr == null)
{
return;
}
var switchSections = new List <SwitchSectionSyntax>();
if (!ConvertIfStatementToSwitchStatementCodeRefactoringProvider.CollectSwitchSections(switchSections, semanticModel, node, switchExpr))
{
return;
}
if (switchSections.Count(s => !s.Labels.OfType <DefaultSwitchLabelSyntax>().Any()) <= 2)
{
return;
}
var switchStatement = SyntaxFactory.SwitchStatement(switchExpr, new SyntaxList <SwitchSectionSyntax>().AddRange(switchSections));
var newRoot = root.ReplaceNode((SyntaxNode)node, switchStatement.WithAdditionalAnnotations(Formatter.Annotation));
context.RegisterCodeFix(CodeActionFactory.Create(node.Span, diagnostic.Severity, "Convert to 'switch' statement", document.WithSyntaxRoot(newRoot)), diagnostic);
}
static bool TryGetDiagnostic(SyntaxNodeAnalysisContext nodeContext, out Diagnostic diagnostic)
{
var node = nodeContext.Node as IfStatementSyntax;
var semanticModel = nodeContext.SemanticModel;
var cancellationToken = nodeContext.CancellationToken;
diagnostic = default(Diagnostic);
if (nodeContext.IsFromGeneratedCode())
{
return(false);
}
if (node.Parent is IfStatementSyntax || node.Parent is ElseClauseSyntax)
{
return(false);
}
var switchExpr = ConvertIfStatementToSwitchStatementCodeRefactoringProvider.GetSwitchExpression(semanticModel, node.Condition);
if (switchExpr == null)
{
return(false);
}
var switchSections = new List <SwitchSectionSyntax>();
if (!ConvertIfStatementToSwitchStatementCodeRefactoringProvider.CollectSwitchSections(switchSections, semanticModel, node, switchExpr))
{
return(false);
}
if (switchSections.Count(s => !s.Labels.OfType <DefaultSwitchLabelSyntax>().Any()) <= 2)
{
return(false);
}
diagnostic = Diagnostic.Create(
descriptor,
node.IfKeyword.GetLocation()
);
return(true);
}