Execute() public method

Defines the method to be called when the command is invoked.
public Execute ( object parameter ) : void
parameter object Data used by the command. If the command does not require data to be passed, this object can be set to null.
return void
AsyncDelegateCommand Class Documentation
Exemplo n.º 1
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        public void CanExecuteDuringAsyncExecute2()
        {
            var tcs = new TaskCompletionSource<object>();
            var canExecute = false;
            var executeCalled = false;

            var command = new AsyncDelegateCommand(() =>
            {
                executeCalled = true;
                return tcs.Task;
            }, () => canExecute);

            Assert.IsFalse(command.CanExecute(null));
            command.Execute(null);
            Assert.IsFalse(executeCalled);

            canExecute = true;
            Assert.IsTrue(command.CanExecute(null));
            command.Execute(null);

            executeCalled = false;
            Assert.IsFalse(command.CanExecute(null));
            command.Execute(null);
            Assert.IsFalse(executeCalled);

            tcs.SetResult(null);
            Assert.IsTrue(command.CanExecute(null));
            command.Execute(null);
            Assert.IsTrue(executeCalled);
        }
Exemplo n.º 2
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        public void CanExecuteDuringAsyncExecute()
        {
            AssertHelper.ExpectedException<ArgumentNullException>(() => new AsyncDelegateCommand((Func<Task>)null));

            var tcs = new TaskCompletionSource<object>();
            var executeCalled = false;

            var command = new AsyncDelegateCommand(() =>
            {
                executeCalled = true;
                return tcs.Task;
            });

            Assert.IsTrue(command.CanExecute(null));
            command.Execute(null);

            executeCalled = false;
            Assert.IsFalse(command.CanExecute(null));
            command.Execute(null);
            Assert.IsFalse(executeCalled);

            tcs.SetResult(null);
            Assert.IsTrue(command.CanExecute(null));
            command.Execute(null);
            Assert.IsTrue(executeCalled);
        }
Exemplo n.º 3
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        public void CanExecuteDuringAsyncExecuteWithParameter()
        {
            var tcs = new TaskCompletionSource<object>();
            string commandParameter = null;

            var command = new AsyncDelegateCommand(p =>
            {
                commandParameter = (string)p;
                return tcs.Task;
            });
            Assert.IsTrue(command.CanExecute(null));
            command.Execute("test");
            Assert.IsFalse(command.CanExecute(null));
            tcs.SetResult(null);
            Assert.IsTrue(command.CanExecute(null));

            Assert.AreEqual("test", commandParameter);
        }
Exemplo n.º 4
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        public void RaiseCanExecuteChangedTest()
        {
            var executed = false;
            var canExecute = false;
            var command = new AsyncDelegateCommand(() => { executed = true; return Task.FromResult((object)null); }, () => canExecute);

            Assert.IsFalse(command.CanExecute(null));
            canExecute = true;
            Assert.IsTrue(command.CanExecute(null));

            AssertHelper.CanExecuteChangedEvent(command, () => command.RaiseCanExecuteChanged());

            AssertHelper.CanExecuteChangedEvent(command, () => command.Execute(null), 2, ExpectedChangedCountMode.Exact);  // Because during execution CanExecute returns false
            Assert.IsTrue(executed);
        }