ValueSymbolExtensions.PollValues Method (IValueSymbol, IObservable.Unit., Boolean)
Polls symbol values on trigger signals.
Namespace: TwinCAT.Ads.Reactive
Assembly: TwinCAT.Ads.Reactive (in
TwinCAT.Ads.Reactive.dll) Version: 6.0.328+39e3229
Syntax
C#
public static IObservable<Object?> PollValues(
this IValueSymbol symbol,
IObservable<Unit> trigger,
bool ignoreErrors
)
Parameters
|
symbol |
Type: TwinCAT.TypeSystem.IValueSymbol |
|
trigger |
Type: System.IObservable.Unit. |
|
ignoreErrors |
Type: System.Boolean |
Return Value
Type: IObservable.Object.
IObservable<System.Object>.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type IValueSymbol. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).
Remarks
If ignoreErrors is not set and ReadRequest errors occur, the observable will be closed with error./> If errors are ignored, the observable will return NULL values on erroneous requests.