fallbackvalue | 易学教程

How to set FallbackValue in binding as path to external image file?

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问题 I'm trying to set FallbackValue in case when my converter cannot be call, but I'm not sure how to do that. <Image Source="{Binding FallbackValue="Pictures/Unknown.png", Path=LatestPosition.DeviceFamily, Converter={x:Static conv:ConverterSet.DeviceTypeToImageSourceconverter}}" Name="image1" Stretch="Fill" Margin="5,8" Width="150" Height="150" Grid.RowSpan="4" /> Paths of external images in converter looks like that and when LatestPosition!=null the image is set in proper way. private static

Many binding errors in visual studio with WPF application?

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问题 When I debug my app visual studio gives many binding errors like those in the example here: Anybody know why this is happening? Also colleague of mine doesn't have those binding errors but has the same version as me. System.Windows.Data Information: 10 : Cannot retrieve value using the binding and no valid fallback value exists; using default instead. BindingExpression:Path=PlanningCd; DataItem=null; target element is 'TextBlock' (Name='planningSchema'); target property is 'NoTarget' (type

How does FallbackValue work with a MultiBinding?

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问题 I ask because it doesn't seem to work. Assume we're binding to the following object: public class HurrDurr { public string Hurr {get{return null;}} public string Durr {get{return null;}} } Well, it would appear that if we used a MultiBinding against this the fallback value would be shown, right? <TextBlock> <TextBlock.Text> <MultiBinding StringFormat="{}{0} to the {1}" FallbackValue="Not set! It works as expected!)"> <Binding Path="Hurr"/> <Binding Path="Durr"/> </MultiBinding> </TextBlock

How does FallbackValue work with a MultiBinding?

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I ask because it doesn't seem to work. Assume we're binding to the following object: public class HurrDurr { public string Hurr {get{return null;}} public string Durr {get{return null;}} } Well, it would appear that if we used a MultiBinding against this the fallback value would be shown, right? <TextBlock> <TextBlock.Text> <MultiBinding StringFormat="{}{0} to the {1}" FallbackValue="Not set! It works as expected!)"> <Binding Path="Hurr"/> <Binding Path="Durr"/> </MultiBinding> </TextBlock.Text> </TextBlock> However the result is, in fact, " to the " . Even forcing the bindings to return