imultivalueconverter | 易学教程

Cannot set multibinding because multivalueconverter must be specified WPF

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问题 i have trouble with WPF converter, it give me this error "Cannot set multibinding because multivalueconverter must be specified WPF". I look in some forums and found some informations , but its still show error My .cs code: namespace Scroll4 { /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window { public MainWindow() { //WindowState = WindowState.Maximized; InitializeComponent(); } public class ScrollOffsetToVisibilityConverter :

Multibinding Multiselection ListView

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问题 OK I have a weird one here. What I am trying to figure out is how to have one listview, populated by an ObservableCollection, update another ListView, populated by another ObservableCollection, based on the first listview's selection and then use a valueconverter to check or uncheck a checkbox based on the selection combined with the current item in the second listview. This part I somewhat have working by using multibinding, but the part that has me stumped is when I check or uncheck an item

How can I convert the values of three sliders into a Color?

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问题 I'm trying to create a custom user control that will allow a user to define a color in WPF. I've done this before in WinForms but in WPF it seems to be not as straight forward. This is also my first time dealing with a multi-converter. The control has 3 Sliders - like so : <Slider x:Name="sdrRed" Height="32" LargeChange="5" SmallChange="1" Maximum="255" Width="321" TickPlacement="Both"/> The only difference is the name for each - sdrRed, sdrGreen, and sdrBlue. This is the multi-value

How can I convert the values of three sliders into a Color?

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I'm trying to create a custom user control that will allow a user to define a color in WPF. I've done this before in WinForms but in WPF it seems to be not as straight forward. This is also my first time dealing with a multi-converter. The control has 3 Sliders - like so : <Slider x:Name="sdrRed" Height="32" LargeChange="5" SmallChange="1" Maximum="255" Width="321" TickPlacement="Both"/> The only difference is the name for each - sdrRed, sdrGreen, and sdrBlue. This is the multi-value converter : public class ByteToColorConverter : IMultiValueConverter { public object Convert( object[ ] values,

Loading images source dynamically with IValueConverter

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I've problems with IValueconverter and dynamically load a row grid image: public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { string Type = (string)value; Uri uri; try { uri = new Uri("/XConsole;component/Images/" + Type + ".png", UriKind.Relative); return new System.Windows.Media.Imaging.BitmapImage(uri) { CacheOption = BitmapCacheOption.None }; } catch (Exception e) { //donothing } uri = new Uri("/XConsole;component/Images/Type_SYSTEM.png", UriKind.Relative); return new System.Windows.Media.Imaging.BitmapImage(uri) { CacheOption

Loading images source dynamically with IValueConverter

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问题 I've problems with IValueconverter and dynamically load a row grid image: public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { string Type = (string)value; Uri uri; try { uri = new Uri("/XConsole;component/Images/" + Type + ".png", UriKind.Relative); return new System.Windows.Media.Imaging.BitmapImage(uri) { CacheOption = BitmapCacheOption.None }; } catch (Exception e) { //donothing } uri = new Uri("/XConsole;component/Images/Type

What are the special values of WPF's Binding engine when converting values?

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问题 I already know about the Binding.DoNothing that one can return from an IValueConverter implementation to signify that no other operation should take place. However, I cannot find a reference, or documentation nicely summing out, what the other special values are - such as returning the fallback value. What are they? 回答1: Binding.DoNothing is an object instance that you actively return from a value converter ; it instructs the binding engine to not update the value of the target property at