JetBrains Rider 2019.2 Help

Detecting Code Issues in Design Time

JetBrains Rider starts analyzing a code file as soon as you open it in the editor, all the way you edit it, until it is closed. All detected code issues are highlighted in the editor according to their severity levels. The map of the issues is also displayed on the marker bar in the right part of the editor window, where you can see instantly the status of the file and click the marks to navigate to specific code issues.

Design-time inspection features

To illustrate the design-time code inspection performed by JetBrains Rider, consider the following code excerpt displayed in the editor:

code analysis sample

In this rather simple example, we can see the following features of JetBrains Rider code inspection:

  1. Status indicator that helps you to see at once whether the current file has errors or warnings.

  2. A fix pop-up that appears for non-imported types. It is enough to press Alt+Enter or click on this pop-up and JetBrains Rider will add the missing directive for all types in the file. For more information, see Importing Missing Namespaces.

  3. A low-priority code issue (in this case, a suggestion related to an unused public member) is greyed out.

  4. A medium-priority code issue (in this case, a warning about a symbol name that does not fit with the naming style) is highlighted with a blue curly underline.

  5. A marker corresponding to the suggestion issue (3) is displayed on the marker bar.

  6. A marker corresponding to the error issue (8) is displayed on the marker bar.

  7. An action indicator that appears to the left of the caret position if JetBrains Rider has anything to suggest there.

  8. A high-priority code issues (in this case, errors related to an unresolved symbol and an incorrect return type) are highlighted with red text and red curly underline.

  9. A marker corresponding to the warning issue (4) is displayed on the marker bar.

  10. The action list, which opens by pressing Alt+Enter or clicking the action indicator (7), contains a list of quick-fixes for the issue at the caret.

  11. A short description of the issue at the caret appears in the status bar. You can also view descriptions of code issues by hovering the mouse over highlighted code or over the issue markers on the marker bar (5,6,9)

  12. If the solution-wide analysis is enabled, JetBrains Rider allows you to see even more code issues. In this example, it detects the unused public member (3) and notifies about errors in other files of your solution. You can click on the solution-wide analysis icon to explore the detected issues.

Toggling design-time inspection

By default, design-time code inspection is enabled in all supported languages. However, you can disable it everywhere or turn it off for specific files if needed. For more information on configuring code inspection, see Configuring Code Inspection Settings.

To configure design-time code inspection

  1. Press Ctrl+Alt+S, or alternatively from the main menu, choose File | Settings on Windows and Linux or JetBrains Rider | Preferences on macOS, then choose Editor | Inspection Settings on the left.

  2. Use the Enable code analysis checkbox to toggle the design-time code inspection.

  3. Optionally, you can enable or disable design-time inspection features on this page:

    Color identifiers

    This option lets you enable or disable ReSharper syntax highlighting scheme.
    If it is selected, language identifiers are highlighted with colors as defined in Visual Studio options: Tools | Options | Environment | Fonts and Colors.
    The list of syntax identifiers provided by ReSharper is available in the Display items list, each name starting with ReSharper prefix.

    Highlight color usages

    Enables highlighting of color definitions in code. For more information, see Color Assistance.

    Highlight special characters in string literals

    Enables highlighting of correct and incorrect escape sequences in non-verbatim strings. For example:

    Highlighting of escape sequence in strings
    For more information, see Regular Expressions Assistance.

    Highlight context exits

    This option, enabled by default, tells JetBrains Rider to highlight all places where the control flow can exit the current context. For example, for a method, it will highlight the return type of the method, all return, throw keywords, and so on when you set the caret to one of these identifiers

    JetBrains Rider highlights context exits
    For a loop, it will additionally highlight the loop keyword as well as all the break statements inside this loop.
    Note that if a method is not entirely visible in the editor, you can invoke the Navigate To Function Exits command on the method name to trigger another kind of highlighting, which will not disappear when your caret leaves the method name.

  4. If necessary, you can select the Enable solution-wide analysis checkbox to enable the Solution-Wide Analysis.

  5. Click Save to apply the modifications and let JetBrains Rider choose where to save them, or save the modifications to a specific settings layer using the Save To list. For more information, see layer-based settings.

If the design-time code inspection is enabled, you can easily navigate between all issues (except those with the hint severity level) detected in the current file.

To navigate to the next/previous code issue in the current file

  • Press Alt+Page Down to go to the next code issue, or Alt+Page Up to go to the previous code issue.

  • In the main menu, choose Navigate | Next Highlighted Error or. Navigate | Previous Highlighted Error.

  • Use the marker bar on the right side of the editor window: clicking on markers brings the caret to the corresponding issues; clicking on the status indicator on top of the marker bar brings the caret to the next issue in the file.

To navigate to the next/previous error

  • Press Shift+Alt+Page Down to go to the next error, or Shift+Alt+Page Up to go to the previous error.

  • If the Solution-Wide Analysis is enabled and there are some errors, the number of errors is displayed in the right corner of the status bar. You can click this number to go to the next error in the solution.

Inspection options menu

Besides suggested fixes, for each configurable code inspection as well as for custom inspections, JetBrains Rider shows the Inspection [name of inspection] ThemedIcon Settings Screen Gray sub-menu in the actions list, with the following items:

Inspection [name of inspection] sub-menu

You can disable the 'Inspection options' sub-menu. To do so, clear the Show code inspection options in action list check box on the Code Inspection | Settings page of JetBrains Rider options.

Finding similar issues

You can not only fix a highlighted issue with a quick-fix, but also find and investigate all similar issues (all issues detected with the same code inspection) in the whole solution or smaller scope.

To find similar issues

  1. Set the caret at a highlighted issue in the editor.

  2. Press Alt+Enter or click the action indicator to the left of the caret to open the action list.

  3. To find similar issues in the current file, choose Inspection [name of inspection] | Find similar issues in [file name] file.

  4. To find similar issues in the current project or solution, expand the submenu and choose the desired scope:

    Using action list to find similar issues

  5. If necessary, you can search for similar issues in any project or solution folder within your solution. To do so, choose Find similar issues in custom scope in the submenu.
    In the dialog that opens, type the name of the desired project or solution folder, and then click OK.

    Specifying search scope for the similar issues

  6. All found issues will be displayed in the Inspection Results window.

Last modified: 20 August 2019

See Also