Contextual Keywords (C# Reference)
A contextual keyword is used to provide a specific meaning in the code, but it is not a reserved word in C#. The following contextual keywords are introduced in this section:
| Keyword | Description |
|---|---|
| add | Defines a custom event accessor that is invoked when client code subscribes to the event. |
| async | Indicates that the modified method, lambda expression, or anonymous method is asynchronous. |
| await | Suspends an async method until an awaited task is completed. |
| dynamic | Defines a reference type that enables operations in which it occurs to bypass compile-time type checking. |
| get | Defines an accessor method for a property or an indexer. |
| global | Alias of the global namespace, which is otherwise unnamed. |
| partial | Defines partial classes, structs, and interfaces throughout the same compilation unit. |
| remove | Defines a custom event accessor that is invoked when client code unsubscribes from the event. |
| set | Defines an accessor method for a property or an indexer. |
| value | Used to set accessors and to add or remove event handlers. |
| var | Enables the type of a variable declared at method scope to be determined by the compiler. |
| when | Specifies a filter condition for a catch block or the case label of a switch statement. |
| where | Adds constraints to a generic declaration. (See also where). |
| yield | Used in an iterator block to return a value to the enumerator object or to signal the end of iteration. |
All query keywords introduced in C# 3.0 are also contextual. For more information, see Query Keywords (LINQ).