static bool TryGetDiagnostic(SyntaxNodeAnalysisContext nodeContext, out Diagnostic diagnostic)
{
diagnostic = default(Diagnostic);
var options = nodeContext.SemanticModel.SyntaxTree.Options as CSharpParseOptions;
if (options != null && options.LanguageVersion < LanguageVersion.CSharp6)
{
return(false);
}
var objectCreateExpression = nodeContext.Node as ObjectCreationExpressionSyntax;
ExpressionSyntax paramNode;
if (!CheckExceptionType(nodeContext.SemanticModel, objectCreateExpression, out paramNode))
{
return(false);
}
var paramName = NotResolvedInTextAnalyzer.GetArgumentParameterName(paramNode);
if (paramName == null)
{
return(false);
}
var validNames = NotResolvedInTextAnalyzer.GetValidParameterNames(objectCreateExpression);
if (!validNames.Contains(paramName))
{
return(false);
}
diagnostic = Diagnostic.Create(descriptor, paramNode.GetLocation(), paramName);
return(true);
}
public async override Task RegisterCodeFixesAsync(CodeFixContext context)
{
var document = context.Document;
var cancellationToken = context.CancellationToken;
var span = context.Span;
var diagnostics = context.Diagnostics;
var model = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
var root = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
var diagnostic = diagnostics.First();
var node = root.FindToken(context.Span.Start).Parent as LiteralExpressionSyntax;
if (node == null)
{
return;
}
var argumentList = node.Parent.Parent as ArgumentListSyntax;
var objectCreateExpression = argumentList.Parent as ObjectCreationExpressionSyntax;
var validNames = NotResolvedInTextAnalyzer.GetValidParameterNames(objectCreateExpression);
var guessName = NotResolvedInTextAnalyzer.GuessParameterName(model, objectCreateExpression, validNames);
ExpressionSyntax paramNode;
ExpressionSyntax altParamNode;
bool canAddParameterName;
NotResolvedInTextAnalyzer.CheckExceptionType(model, objectCreateExpression, out paramNode, out altParamNode, out canAddParameterName);
if (diagnostic.Id == CSharpDiagnosticIDs.NotResolvedInTextAnalyzer_SwapID)
{
context.RegisterCodeFix(
CodeActionFactory.Create(
node.Span,
diagnostic.Severity,
GettextCatalog.GetString("Swap parameter"),
(token) =>
{
var list = new List <ArgumentSyntax>();
foreach (var arg in argumentList.Arguments)
{
if (arg.Expression == paramNode)
{
list.Add((Microsoft.CodeAnalysis.CSharp.Syntax.ArgumentSyntax)altParamNode.Parent);
continue;
}
if (arg.Expression == altParamNode)
{
list.Add((Microsoft.CodeAnalysis.CSharp.Syntax.ArgumentSyntax)paramNode.Parent);
continue;
}
list.Add(arg);
}
var newRoot = root.ReplaceNode(argumentList, SyntaxFactory.ArgumentList(SyntaxFactory.SeparatedList(list)).WithAdditionalAnnotations(Formatter.Annotation));
return(Task.FromResult(document.WithSyntaxRoot(newRoot)));
}
),
diagnostic
);
}
else if (diagnostic.Id == CSharpDiagnosticIDs.NotResolvedInTextAnalyzerID)
{
var fixes = new List <CodeAction>();
if (canAddParameterName)
{
fixes.Add(
CodeActionFactory.Create(
node.Span,
diagnostic.Severity,
string.Format(GettextCatalog.GetString("Add '\"{0}\"' parameter."), guessName),
(token) =>
{
var newArgument = SyntaxFactory.ParseExpression('"' + guessName + '"');
var newRoot = root.ReplaceNode(argumentList, argumentList.WithArguments(argumentList.Arguments.Insert(0, SyntaxFactory.Argument(newArgument))).WithAdditionalAnnotations(Formatter.Annotation));
return(Task.FromResult(document.WithSyntaxRoot(newRoot)));
}
)
);
}
fixes.Add(CodeActionFactory.Create(
node.Span,
diagnostic.Severity,
string.Format(GettextCatalog.GetString("Replace with '\"{0}\"'."), guessName),
(token) =>
{
var newArgument = SyntaxFactory.ParseExpression('"' + guessName + '"');
var newRoot = root.ReplaceNode(node, newArgument.WithLeadingTrivia(node.GetLeadingTrivia()).WithTrailingTrivia(node.GetTrailingTrivia()));
return(Task.FromResult(document.WithSyntaxRoot(newRoot)));
}
));
context.RegisterFixes(
fixes,
diagnostic
);
}
}