System.Windows.Forms.Button.PerformClick C# (CSharp) Method

		public void PerformClick ()			// IButtonControl
		{			
			if (CanSelect)
				OnClick (EventArgs.Empty);
		}

        public void AssignCommandToButton()
        {
            CommandProvider.OnClickCount = 0;
            TestViewModel viewModel = new TestViewModel();
            using(var button = new Button()) {
                button.SetCommand(viewModel.TestCommand);
                Assert.That(viewModel.TestCommandExecuteCount, Is.EqualTo(0));

                button.PerformClick();
                Assert.That(viewModel.TestCommandExecuteCount, Is.EqualTo(1));
                Assert.That(viewModel.ExecuteParameter, Is.Null);
                Assert.That(viewModel.CanExecuteParameter, Is.Null);
                Assert.That(CommandProvider.OnClickCount, Is.EqualTo(1));

                button.SetCommand(null);
                button.PerformClick();
                Assert.That(viewModel.TestCommandExecuteCount, Is.EqualTo(1));
                Assert.That(CommandProvider.OnClickCount, Is.EqualTo(1));

                viewModel.CanExecuteTestCommand = false;
                button.SetCommand(viewModel.TestCommand);
                button.PerformClick();
                Assert.That(viewModel.TestCommandExecuteCount, Is.EqualTo(1));
                Assert.That(CommandProvider.OnClickCount, Is.EqualTo(1));

                viewModel.CanExecuteTestCommand = true;
                button.SetCommandParameter("param");
                button.PerformClick();
                Assert.That(viewModel.TestCommandExecuteCount, Is.EqualTo(2));
                Assert.That(viewModel.ExecuteParameter, Is.EqualTo("param"));
                Assert.That(viewModel.CanExecuteParameter, Is.EqualTo("param"));
                Assert.That(CommandProvider.OnClickCount, Is.EqualTo(2));
            }
        }