Question

I m a beginner of sliverlight and MVVM. I can not bind textblock property from another class to UI class using MVVM.

My code is here. Please let me know how to bind textblock property in bellow Authentication.cs.

MainPage.xaml

<TextBlock Height="30" Margin="122,218,0,0" Name="textBlock3" Text="{Binding Path=ErrorStatus, Mode=TwoWay}" VerticalAlignment="Top" HorizontalAlignment="Left" Width="86" />

MainPage.xaml.cs

private Authentication authentication;

// Constructor
public MainPage()
{
    InitializeComponent();
    this.DataContext = authentication;
}

ViewModelBase.cs

public class ViewModelBase : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    protected void NotifyPropertyChanged(String info)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(info));
        }
    }
}

Authentication.cs

public class Authentication : ViewModelBase
{
    private string _ErrorStatus;
    public string ErrorStatus
    {
        get
        {
            return _ErrorStatus;
        }
        set
        {
            _ErrorStatus = value;
            NotifyPropertyChanged("ErrorStatus");
        }
    }

    void Authenticate()
    {
        //Here, I write authentication code....
        //After the authentication code, I want to change textBlock property depend on auth status.
        //Please let me know how to write code.
    }
}

Answer 1

http://www.ohchr.org。

文本Box的正文提到ErrorStatus 财产,因此,在更新文本Box时,也会自动更新。

唯一需要肯定的是,你在文本Box受约束的同一物体上打上了<条码>。

private Authentication authentication = new Authentication();

public MainPage()
{
    InitializeComponent();

    // New line here
    this.authentication = new Authentication();

    this.DataContext = authentication;
}

void btnAuthenticate_Click(object src, EventArgs e)
{
    authentication.Authenticate();
}

XAML:

<TextBlock Text="{Binding Path=ErrorStatus, Mode=TwoWay}" />

Answer 2

页: 1 向主窗口主线添加以下线:

// Constructor
public MainPage()
{
    InitializeComponent();

    // New line here
    this.authentication = new Authentication();

    this.DataContext = authentication;
}

当您打电话Authenticate(>)时,你只能给以新的价值。 ErrorStatus , 并填写在上。

Answer 3

这就是代表指挥模式(也称为中继指挥)在。采用这种模式,而不是在你后面的法典中处理纽芬兰语,你的看法显示,ICommand的情况只不过是把事件推向一种观点。现在,认证符合您的看法,可以直接更新财产。

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