Default value at design time XAML

问题

I have a binded TextBlock, XAML:

<TextBlock Text="{Binding MyText}"/>

I know the FallbackValue can be used if the Binding isn't available, but this happens at run time ? Is there any way to show a default value at design time ? It would make things easier if I could see a value when designing my windows instead of an empty TextBlock.

Thanks

回答1:

If you would prefer a less verbose version of Ian Bamforth's answer, you can just do

<TextBlock Text="{Binding MyText, FallbackValue=None}"/>

回答2:

Adapting an example from this question.

This works for me - the text "None" is shown in the designer:

 <TextBlock>
    <TextBlock.Text>
        <Binding ElementName="root" Path="blah" FallbackValue="None" />
    </TextBlock.Text>
</TextBlock>

Hope that helps

回答3:

If you have this data bound and are using the MVVM architecture then setting a DEFAULT value for the model item it is bound to will display the value at design time

I am just using:

Model.cs:

private int frame = 999999;
public int Frame
{
  get { return frame; }
  set
  {
    frame = value;
    NotifyPropertyChanged(m => m.Frame);
  }
}

and in my XAML:

 <TextBlock Text="{Binding Path=Frame}"  />

and the default value of "999999" is being displayed in the designer

来源：https://stackoverflow.com/questions/17208665/default-value-at-design-time-xaml