ProvideLanguageServiceAttribute.EnableAsyncCompletion Property
Definition
Important
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Determines whether the language supports background parsing.
public:
property bool EnableAsyncCompletion { bool get(); void set(bool value); };public:
property bool EnableAsyncCompletion { bool get(); void set(bool value); };public bool EnableAsyncCompletion { get; set; }member this.EnableAsyncCompletion : bool with get, setPublic Property EnableAsyncCompletion As BooleanProperty Value
Returns true if background parsing is allowed; otherwise, returns false.
Examples
[ProvideLanguageService(typeof(MyLanguageService), // Required
MyConstants.languageName, // Required
MyConstants.languageNameResourceID, // Required
// Optional language service properties
EnableAsyncCompletion = true, // Background parsing supported
)]
Remarks
Whenever a completion list needs to be displayed, a parsing operation is started to determine what goes in the completion list. To maintain the responsiveness of the user interface, the parsing operation should be performed on a background thread. If a language service supports background parsing, set the EnableAsyncCompletion property to true.
Note
The managed package framework (MPF) examines this property anytime it starts a potentially lengthy parse and not just for completion lists.
This property is specific to the managed package framework (MPF).
The default is true when the corresponding registry entry is accessed through the LanguagePreferences class.
The registry entry looks like this:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\[X.Y]\Languages\Language Services\
[Language Name]\
EnableAsyncCompletion = reg_dword: 0x00000001