ProvideLanguageServiceAttribute.EnableAsyncCompletion Property
Determines whether the language supports background parsing.
Namespace: Microsoft.VisualStudio.Shell
Assembly: Microsoft.VisualStudio.Shell.12.0 (in Microsoft.VisualStudio.Shell.12.0.dll)
Syntax
'Declaration
Public Property EnableAsyncCompletion As Boolean
public bool EnableAsyncCompletion { get; set; }
public:
property bool EnableAsyncCompletion {
bool get ();
void set (bool value);
}
member EnableAsyncCompletion : bool with get, set
function get EnableAsyncCompletion () : boolean
function set EnableAsyncCompletion (value : boolean)
Property Value
Type: Boolean
Returns true if background parsing is allowed; otherwise, returns false.
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
Examples
[ProvideLanguageService(typeof(MyLanguageService), // Required
MyConstants.languageName, // Required
MyConstants.languageNameResourceID, // Required
// Optional language service properties
EnableAsyncCompletion = true, // Background parsing supported
)]
.NET Framework Security
- Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.