Type-matching completion
This command filters the list of types, methods, and variables to match the expected type of expression. It works anywhere as long as JetBrains Rider can determine the expected type of the expression, for example, right-hand sides of assignments, variable initializers, or return statements. If several return types are possible, JetBrains Rider detects the most recently used symbol of an applicable type and automatically selects it in the lookup list. Type-Matching Completion can also suggest creating anonymous delegates, lambda expressions, and regular methods, as well as local variables for out parameters. In addition to that, in object initializers, Type-Matching Completion suggests fields/properties that were not yet assigned a value.
Invoke type-matching completion
Place the caret at the position where you're going to type your code.
Press Control+Shift+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 Control+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 Control+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 Control+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 Control+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 type-matching completion
You can use the following examples to get an idea of how smart type-matching completion works with various code items:
After a return statement
In the right-hand side of assignments
In cast expressions
Before:
After launching Type-Matching Completion (since there's a single option in this case, JetBrains Rider inserts the expected type without displaying a list):
In object initializers
JetBrains Rider provides Type-Matching Completion for setting properties in object initializers that were not previously set for a particular object:
In lambda expressions
In addition to traditional anonymous and named methods, Type-Matching Completion readily generates lambda-expression syntax:
Creating a local variable in place of an out parameter
Using CamelHumps
