ValidationRequestedEventArgs.AddAsyncValidator Method
Definition
Important
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Registers an asynchronous validation to be run and awaited as part of the current validation pass.
public void AddAsyncValidator(Func<System.Threading.CancellationToken,System.Threading.Tasks.Task> validator);member this.AddAsyncValidator : Func<System.Threading.CancellationToken, System.Threading.Tasks.Task> -> unitPublic Sub AddAsyncValidator (validator As Func(Of CancellationToken, Task))Parameters
- validator
- Func<CancellationToken,Task>
A validator method that starts the asynchronous validation work and returns the
resulting Task. It is invoked by ValidateAsync(CancellationToken)
with the validation pass's cancellation token, and the returned task is awaited before the pass
completes. The method must not return a null task.
Exceptions
validator is null.
validator returned null, or this is the shared non-async Empty instance.