public async Task ValueAsyncDisposal()
{
var john = AsyncDisposableTestPerson.CreateJohn();
var emily = AsyncDisposableTestPerson.CreateEmily();
var options = new ActiveExpressionOptions();
options.AddExpressionValueDisposal(() => CombineAsyncDisposablePeople(null !, null !));
AsyncDisposableTestPerson?first, second;
var disposedTcs = new TaskCompletionSource <object?>();
using (var expr = ActiveExpression.Create(() => CombineAsyncDisposablePeople(john.Name !.Length > 3 ? john : emily, emily), options))
{
Assert.IsNull(expr.Fault);
first = expr.Value;
Assert.IsFalse(first !.IsDisposed);
first.Disposed += (sender, e) => disposedTcs.SetResult(null);
john.Name = string.Empty;
await Task.WhenAny(disposedTcs.Task, Task.Delay(TimeSpan.FromSeconds(1)));
Assert.IsNull(expr.Fault);
second = expr.Value;
Assert.IsFalse(second !.IsDisposed);
Assert.IsTrue(first.IsDisposed);
disposedTcs = new TaskCompletionSource <object?>();
second.Disposed += (sender, e) => disposedTcs.SetResult(null);
}
await Task.WhenAny(disposedTcs.Task, Task.Delay(TimeSpan.FromSeconds(1)));
Assert.IsTrue(second.IsDisposed);
}
public async Task ValueAsyncDisposalAsync()
{
var people = new ObservableCollection <AsyncDisposableTestPerson>
{
AsyncDisposableTestPerson.CreateJohn(),
AsyncDisposableTestPerson.CreateEmily()
};
var disposedTcs = new TaskCompletionSource <object?>();
AsyncDisposableTestPerson?newPerson;
using (var expr = ActiveExpression.Create(p => p[0] + p[1], people))
{
newPerson = expr.Value;
Assert.IsFalse(newPerson !.IsDisposed);
newPerson.Disposed += (sender, e) => disposedTcs.SetResult(null);
people[0] = AsyncDisposableTestPerson.CreateJohn();
await Task.WhenAny(disposedTcs.Task, Task.Delay(TimeSpan.FromSeconds(1)));
Assert.IsTrue(newPerson.IsDisposed);
newPerson = expr.Value;
Assert.IsFalse(newPerson !.IsDisposed);
disposedTcs = new TaskCompletionSource <object?>();
newPerson.Disposed += (sender, e) => disposedTcs.SetResult(null);
}
await Task.WhenAny(disposedTcs.Task, Task.Delay(TimeSpan.FromSeconds(1)));
Assert.IsTrue(newPerson.IsDisposed);
}
static AsyncDisposableTestPerson CombineAsyncDisposablePeople(AsyncDisposableTestPerson a, AsyncDisposableTestPerson b) => new AsyncDisposableTestPerson
{
Name = $"{a.Name} {b.Name}"
};
