Basic completion
JetBrains Rider's basic completion suggests names of classes, methods, variables, keywords, and any other symbols that are available within the current visibility scope including extension methods that were previously imported. Many other context-specific suggestions, like live templates, code generation suggestions, unit test categories are also available in the completion list.
By default, suggestions of basic completion also include items from Second basic completion. If you want to change the default behavior, use the corresponding controls on the page of JetBrains Rider settings Ctrl+Alt+S.
The list of completion suggestions is the same as that of Automatic completion.
Invoke basic completion
Place the caret at the position where you're going to type your code.
Press Ctrl+Space.
Select a suggestion from the list and press Enter or start typing the initial letters of the identifier or its CamelHumps abbreviation to narrow down the list of suggestions.
When you use code completion over existing code items, you can either insert the selected completion suggestion before the existing item by pressing Enter or replace the existing identifier with the selected suggestion by pressing Tab. If necessary, you can change the default shortcuts on the page of JetBrains Rider settings Ctrl+Alt+S (look for the Choose Lookup Item and Choose Lookup Item Replace actions) .
When you select items in completion lists using keyboard, the selection will jump to the first item after the last item and vice versa. You can disable this behavior by clearing Cyclic scrolling in list on the page of JetBrains Rider settings Ctrl+Alt+S.
Complete method calls
When choosing a method call from the completion list, by default JetBrains Rider automatically inserts a pair of parentheses ( )
and sets the caret between them. You can change this behavior with the Automatically insert parenthesis after completion option on the page of JetBrains Rider settings Ctrl+Alt+S.
Note that you can type the opening parenthesis (
instead of Tab or Enter when a method is selected in the completion list. In this case the pair of parentheses will be inserted regardless of this option.
Exclude types and namespaces from completion suggestions
You may want some types or namespaces not to be suggested, for example, if you have something similar to a system type in your solution, say MyFramework.MyCollections.List
, but you are not actually using it. To exclude such items from the suggestions, add them to the Exclude from import and completion list on the page of JetBrains Rider settings Ctrl+Alt+S.
The format of the entries is Fully.Qualified.Name
, Fully.Qualified.Name.Prefix*
, or *Fully.Qualified.Name.Suffix
. Generic types are specified as List`1
.
You can access code completion settings right from the completion popup — click at the bottom of the popup and select Code Completion Settings.
Examples of basic completion
You can use the following examples to get an idea of how basic completion works with various code items:
Suggesting type-based variable names
Commonly used names for fields and variables are suggested depending on their type. After entering the type of variable, press Ctrl+Space. The look-up list displays the suggested names:
![JetBrains Rider: Suggesting type-based variable names in code completion JetBrains Rider: Suggesting type-based variable names in code completion](https://resources.jetbrains.com.cn/help/img/rider/2024.2/Coding_Assistance__Code_Completion__Symbol__01.png)
If you enter a variable name prefix, JetBrains Rider will append it to each suggested name:
![JetBrains Rider: Suggesting type-based variable names in code completion JetBrains Rider: Suggesting type-based variable names in code completion](https://resources.jetbrains.com.cn/help/img/rider/2024.2/Coding_Assistance__Code_Completion__Symbol__02.png)
You can specify a prefix and/or a suffix for all new variable names on the
page of JetBrains Rider settings Ctrl+Alt+S. If you do that, completion items will be modified accordingly:![JetBrains Rider: Suggesting type-based variable names in code completion JetBrains Rider: Suggesting type-based variable names in code completion](https://resources.jetbrains.com.cn/help/img/rider/2024.2/Coding_Assistance__Code_Completion__Symbol__06.png)
Suggesting members of a class
![JetBrains Rider: Suggesting members of a class in code completion JetBrains Rider: Suggesting members of a class in code completion](https://resources.jetbrains.com.cn/help/img/rider/2024.2/Coding_Assistance__Code_Completion__Symbol__03.png)
Suggesting visible types
![JetBrains Rider: Suggesting visible types in code completion JetBrains Rider: Suggesting visible types in code completion](https://resources.jetbrains.com.cn/help/img/rider/2024.2/Coding_Assistance__Code_Completion__Symbol__04.png)
Suggesting C# keywords
![JetBrains Rider: Suggesting C# keywords in code completion JetBrains Rider: Suggesting C# keywords in code completion](https://resources.jetbrains.com.cn/help/img/rider/2024.2/Coding_Assistance__Code_Completion__Symbol__05.png)
Suggesting 'this' keyword for static methods in static classes
![JetBrains Rider: Suggesting 'this' keyword for static methods in static classes JetBrains Rider: Suggesting 'this' keyword for static methods in static classes](https://resources.jetbrains.com.cn/help/img/rider/2024.2/Coding_Assistance__Code_Completion__Symbol__this.png)
Completion for enum members
![JetBrains Rider: Completion for enum members JetBrains Rider: Completion for enum members](https://resources.jetbrains.com.cn/help/img/rider/2024.2/Coding_Assistance__Code_Completion__Symbol__enum_members_01.png)
![JetBrains Rider: Completion for enum members JetBrains Rider: Completion for enum members](https://resources.jetbrains.com.cn/help/img/rider/2024.2/Coding_Assistance__Code_Completion__Symbol__enum_members_02.png)
Using CamelHumps in code completion
![JetBrains Rider: Using CamelHumps in code completion JetBrains Rider: Using CamelHumps in code completion](https://resources.jetbrains.com.cn/help/img/rider/2024.2/Coding_Assistance__Code_Completion__Symbol__07.png)
Completion for unresolved symbols
Early used names of data types and their members are suggested, even if they are not declared anywhere in the code and cannot be resolved.
![JetBrains Rider: Completion for unresolved symbols JetBrains Rider: Completion for unresolved symbols](https://resources.jetbrains.com.cn/help/img/rider/2024.2/Coding_Assistance__Code_Completion__Symbol__unresolved.png)
Completion for argument names
![JetBrains Rider: Completion for argument names JetBrains Rider: Completion for argument names](https://resources.jetbrains.com.cn/help/img/rider/2024.2/Coding_Assistance__Code_Completion__Argument_names.png)
Suggesting members of a dynamic type
![JetBrains Rider: Suggesting members of a dynamic type JetBrains Rider: Suggesting members of a dynamic type](https://resources.jetbrains.com.cn/help/img/rider/2024.2/Coding_Assistance__Code_Completion__Dynamic_members.png)
Suggesting existing partial classes
When you type partial class
, names of partial classes in the current scope are added to the suggestion list, thus helping you to quickly create new parts of existing partial classes.
![Suggestions for existing partial classes in JetBrains Rider code completion Suggestions for existing partial classes in JetBrains Rider code completion](https://resources.jetbrains.com.cn/help/img/rider/2024.2/Coding_Assistance__Code_Completion__Generative__generative_completion_03.png)
Void expression hint
If code completion is invoked on a void
-returning expression, the suggestion list displays a special hint, which helps you understand that no calls can be made at that point. Accepting this void item will just add a semicolon if it was not added before:
![JetBrains Rider: void expression hint in code completion JetBrains Rider: void expression hint in code completion](https://resources.jetbrains.com.cn/help/img/rider/2024.2/void_expression_hint.png)