Code Inspections in ASP.NET

In ASP.NET, JetBrains Rider 2025.1 provides two kinds of code inspections: 6 inspections that detect errors such as broken syntax, unresolved symbols, compiler errors, and so on (you cannot configure or disable any of these inspections), and 39 proprietary code inspections, any of which you can disable or change its severity level.
These code inspections help you detect code issues in design time in all open files, and additionally they allow you to find code issues in specific scope.

Configurable ASP.NET inspections are listed below, grouped by their categories.

Common Practices and Code Improvements (1 inspection)

This category groups inspections that hunt for medium severity issues that mainly affect code readability.

Inspection ID EditorConfig property	Default severity
Attribute with optional value problem `Asp.TagAttributeWithOptionalValue` `resharper_asp_tag_attribute_with_optional_value_highlighting`	Warning

Inspection
ID
EditorConfig property

Default severity

Attribute with optional value problem

Asp.TagAttributeWithOptionalValue
resharper_asp_tag_attribute_with_optional_value_highlighting

Warning

Grammar Issues (4 inspections)

Inspections in this category report grammar issues in string literals and documentation comments.

Inspection ID EditorConfig property	Default severity
Grammar error in comment `GrammarMistakeInComment` `resharper_grammar_mistake_in_comment_highlighting`	Suggestion
Grammar error in markup attribute value `GrammarMistakeInMarkupAttribute` `resharper_grammar_mistake_in_markup_attribute_highlighting`	Suggestion
Grammar error in markup text `GrammarMistakeInMarkupText` `resharper_grammar_mistake_in_markup_text_highlighting`	Suggestion
Grammar error in string literal `GrammarMistakeInStringLiteral` `resharper_grammar_mistake_in_string_literal_highlighting`	Disabled

Potential Code Quality Issues (25 inspections)

This category includes inspections that detect critical issues (code smells), mostly with Error or Warning level. This category also includes inspections that ensure localization assistance.

Inspection ID EditorConfig property	Default severity
ASP.NET Dead Code `Asp.DeadCode` `resharper_asp_dead_code_highlighting`	Warning
ASP.NET Resolve Warning `Asp.ResolveWarning` `resharper_asp_resolve_warning_highlighting`	Warning
ASP.NET Warning `Asp.Warning` `resharper_asp_warning_highlighting`	Warning
Cannot resolve property `PropertyNotResolved` `resharper_property_not_resolved_highlighting`	Error
Cannot resolve resource `ResourceNotResolved` `resharper_resource_not_resolved_highlighting`	Error
Cannot resolve resource item `ResourceItemNotResolved` `resharper_resource_item_not_resolved_highlighting`	Error
Invalid control type `Asp.InvalidControlType` `resharper_asp_invalid_control_type_highlighting`	Error
MVC (mismatch Model Type) `Mvc.InvalidModelType` `resharper_mvc_invalid_model_type_highlighting`	Error
MVC (unknown action) `Mvc.ActionNotResolved` `resharper_mvc_action_not_resolved_highlighting`	Error
MVC (unknown area) `Mvc.AreaNotResolved` `resharper_mvc_area_not_resolved_highlighting`	Error
MVC (unknown controller) `Mvc.ControllerNotResolved` `resharper_mvc_controller_not_resolved_highlighting`	Error
MVC (unknown masterpage) `Mvc.MasterpageNotResolved` `resharper_mvc_masterpage_not_resolved_highlighting`	Error
MVC (unknown partial view) `Mvc.PartialViewNotResolved` `resharper_mvc_partial_view_not_resolved_highlighting`	Error
MVC (unknown template) `Mvc.TemplateNotResolved` `resharper_mvc_template_not_resolved_highlighting`	Error
MVC (unknown view component view) `Mvc.ViewComponentViewNotResolved` `resharper_mvc_view_component_view_not_resolved_highlighting`	Error
MVC (unknown view component) `Mvc.ViewComponentNotResolved` `resharper_mvc_view_component_not_resolved_highlighting`	Error
MVC (unknown view) `Mvc.ViewNotResolved` `resharper_mvc_view_not_resolved_highlighting`	Error
Non-accessed field (non-private accessibility) `NotAccessedField.Global` `resharper_not_accessed_field_global_highlighting`	Suggestion
Object data source method resolve problem `AspOdsMethodReferenceResolveError` `resharper_asp_ods_method_reference_resolve_error_highlighting`	Error
Unknown content placeholder `Asp.ContentPlaceholderNotResolved` `resharper_asp_content_placeholder_not_resolved_highlighting`	Error
Unknown skin `Asp.SkinNotResolved` `resharper_asp_skin_not_resolved_highlighting`	Error
Unknown symbol `Asp.NotResolved` `resharper_asp_not_resolved_highlighting`	Error
Unknown theme `Asp.ThemeNotResolved` `resharper_asp_theme_not_resolved_highlighting`	Error
Unsupported pageParserFilterType `Asp.CustomPageParserFilterType` `resharper_asp_custom_page_parser_filter_type_highlighting`	Warning
Wrong image size `Asp.Image` `resharper_asp_image_highlighting`	Warning

Redundancies in Code (3 inspections)

Code inspections in this category look for redundancies and dead code, which affect code readability and style, and could be safely removed. Some code redundancies cannot be fixed automatically, and quick-fixes for them are performed in the interactive mode, requiring the user input. But the majority of the redundancies can be fixed without user interaction, using either fix in scope or code cleanup.

Inspection ID EditorConfig property	Default severity
Redundant using directive `RedundantUsingDirective` `resharper_redundant_using_directive_highlighting`	Warning
Unused import clause `UnusedImportClause` `resharper_unused_import_clause_highlighting`	Warning
Unused register directive `AspUnusedRegisterDirectiveHighlighting` `resharper_asp_unused_register_directive_highlighting_highlighting`	Warning

Inspection
ID
EditorConfig property

Default severity

Redundant using directive

RedundantUsingDirective
resharper_redundant_using_directive_highlighting

Warning

Unused import clause

UnusedImportClause
resharper_unused_import_clause_highlighting

Warning

Unused register directive

AspUnusedRegisterDirectiveHighlighting
resharper_asp_unused_register_directive_highlighting_highlighting

Warning

Redundancies in Symbol Declarations (1 inspection)

This category includes code inspections, mostly with the warning severity level, which detect empty and unused symbol declarations.

Inspection ID EditorConfig property	Default severity
Type member is never used (non-private accessibility) `UnusedMember.Global` `resharper_unused_member_global_highlighting`	Suggestion

Inspection
ID
EditorConfig property

Default severity

Type member is never used (non-private accessibility)

UnusedMember.Global
resharper_unused_member_global_highlighting

Suggestion

Spelling Issues (5 inspections)

These inspections detect typos in various contexts.

Inspection ID EditorConfig property	Default severity
Typo in comment `CommentTypo` `resharper_comment_typo_highlighting`	Suggestion
Typo in identifier `IdentifierTypo` `resharper_identifier_typo_highlighting`	Suggestion
Typo in markup attribute value `MarkupAttributeTypo` `resharper_markup_attribute_typo_highlighting`	Suggestion
Typo in markup text `MarkupTextTypo` `resharper_markup_text_typo_highlighting`	Suggestion
Typo in string literal `StringLiteralTypo` `resharper_string_literal_typo_highlighting`	Suggestion

31 March 2025