为什么在wpf中此用户控件未正确绑定（使用caliburn micro）

Question

I have a user control that I placed it on another user control as follow:

<Grid>
    <Control:ViewerControl  x:Name="ViewerControl" />
</Grid>

and in VM I have:

public ImageSourceViewModel()
{
    this.ViewerControl = new ViewerControl();

}

#endregion

#region Public Properties

/// <summary>
/// Gets the viewer control.
/// </summary>
public ViewerControl ViewerControl { get; private set; }

But it is not bindded.

I also tested this and did not get the correct result:

<Grid>
    <Control:ViewerControl  DataContext="{Binding ViewerControl}" />
</Grid>

The reason that I think it is not bind correctly is as follow:

To test that it is binded correctly, I placed a textblock on ViewerControl as follow:

 <TextBlock Grid.Row="1"  Foreground="Blue"  x:Name="TextData" x:FieldModifier="public"/>

and in ViewerControl contructor I have:

public ViewerControl()
{
   TextData.Text = DateTime.Now.ToShortTimeString();   
}

public 

and I changed VM so it sets TextData to a new value as follow:

public ImageSourceViewModel()
{
    this.ViewerControl = new ViewerControl();
    ViewerControl.TextData.Text = "test";
}   

If the viewer control bind correctly, I should see the test on screen but I am still seeing the time. so it is not bind correctly.

I am using Caliburn micro but the control which is written by somebody else is not using caliburn micro.

Answer 1

You must be very confused about data binding because you are trying to data bind your UserControl to another instance of your UserControl :

<Control:ViewerControl DataContext="{Binding ViewerControl}" />

...

ViewerControl = new ViewerControl();

In WPF, we data bind data elements to UI elements , so your problem has nothing to do with Caliburn and I'd really recommend that you learn to use WPF properly before you add a further level of complexity (Caliburn). Please refer to the Data Binding Overview page on MSDN for further help with understanding data binding.