Can we concat two properties in data binding?

问题

Can we concat two properties together in binding expression? If possible without converter or without writing two textblocks and setting them individually?

回答1:

Like alpha-mouse suggests MultiBinding won't work out of the box, but this guy has thrown something together that might help:

http://www.olsonsoft.com/blogs/stefanolson/post/Improvements-to-Silverlight-Multi-binding-support.aspx

If that seems a bit rogue, then maybe try putting a combined value property on your object as a helper for the Binding mechanism, like:

public string FullName {
   get { return this.FirstName + " " + this.LastName; }
}

回答2:

If you want to show, say FirstName and LastName, in a single TextBlock, then you can do like this:

<TextBlock>
     <Run Text="{Binding FirstName}" />
     <Run Text="   " /> <!-- space -->
     <Run Text="{Binding LastName}" />
</TextBlock>

Now, the TextBlock's Text property will be "Sachin Tendulkar" and will be displayed if:

FirstName = Sachin
LastName  = Tendulkar

Hope that helps.

回答3:

<TextBlock.Text>
   <MultiBinding StringFormat="{}{0} , {1}">
     <Binding Path="data1" />
     <Binding Path="data2" />
    </MultiBinding>
</TextBlock.Text>

data1 and data2 are string properties which are binded.

回答4:

It is possible in WPF with the help of MultiBinding and StringFormat. But not in Silverlight unfortunately.

回答5:

If you need to add any string, then try it. Here I add "%" after binding text in windows phone.

<TextBlock Text="{Binding Path=clouds.all, StringFormat=\{0\}%}"/>

回答6:

You can add a new property with a getter that performs the concatenation.

Say you have FirstName and LastName properties. You can then define a Name property as follows:

public string Name { get { return FirstName + " " + LastName; } }

This will work well, but you should be aware that you cannot do two-way binding for a read-only property. Also you may want to implement property changed notification for the concatenated property in the setters for the source properties.

来源：https://stackoverflow.com/questions/4325453/can-we-concat-two-properties-in-data-binding

标签

wpf

silverlight-4.0