Mvvm 当文本框失去焦点时，ReactiveUI RaiseAndSetIfChanged hit

我正在使用ReactiveCommand：

LoginCommand = new ReactiveCommand(this.WhenAny(x => x.UserName, x => x.Password, (r, g) => !string.IsNullOrEmpty(r.Value)  &&!string.IsNullOrEmpty(g.Value)));            
LoginCommand.Subscribe(async _ =>
{
var user = await _authenticationService.AuthenticateUser(_userName, _password);
                if (user.Error != null)
                {
                    MessageBox.Show("The user was not found. Please try again!", "User Not Found", MessageBoxButton.OK, MessageBoxImage.Exclamation);
                    return;
                }               
                screen.Router.Navigate.Execute(new MainViewModel(screen));
            });

以及用于绑定的用户名、密码字段：

public string Password
{
   get { return _password; }
   set { this.RaiseAndSetIfChanged(ref _password, value); }
}   

和此绑定的文本框到：

 <TextBox x:Name="txtPassword" Text="{Binding Password}" Grid.Column="1" Grid.Row="2" Margin="3,3,0,3" MinWidth="100" HorizontalAlignment="Left" Width="10" Height="30"/>

---

这段代码可以工作，但当我失去对文本框的关注时。当我开始用reactiveUI在文本框上写东西时，有没有合适的方法可以做到这一点。

使用UpdateSourceTrigger属性。顾名思义，这意味着每当TextBox的Text属性发生更改时，就会触发RaiseAndSetIfChanged

<TextBox x:Name="txtPassword" Text="{Binding Password, UpdateSourceTrigger=PropertyChanged}" Grid.Column="1" Grid.Row="2" Margin="3,3,0,3" MinWidth="100" HorizontalAlignment="Left" Width="10" Height="30"/>

---

使用UpdateSourceTrigger属性。顾名思义，这意味着每当TextBox的Text属性发生更改时，就会触发RaiseAndSetIfChanged

<TextBox x:Name="txtPassword" Text="{Binding Password, UpdateSourceTrigger=PropertyChanged}" Grid.Column="1" Grid.Row="2" Margin="3,3,0,3" MinWidth="100" HorizontalAlignment="Left" Width="10" Height="30"/>

---

使用UpdateSourceTrigger属性。顾名思义，这意味着每当TextBox的Text属性发生更改时，就会触发RaiseAndSetIfChanged

<TextBox x:Name="txtPassword" Text="{Binding Password, UpdateSourceTrigger=PropertyChanged}" Grid.Column="1" Grid.Row="2" Margin="3,3,0,3" MinWidth="100" HorizontalAlignment="Left" Width="10" Height="30"/>

---

使用UpdateSourceTrigger属性。顾名思义，这意味着每当TextBox的Text属性发生更改时，就会触发RaiseAndSetIfChanged

<TextBox x:Name="txtPassword" Text="{Binding Password, UpdateSourceTrigger=PropertyChanged}" Grid.Column="1" Grid.Row="2" Margin="3,3,0,3" MinWidth="100" HorizontalAlignment="Left" Width="10" Height="30"/>