ivalueconverter

问题 I am new to WPF. I just don't understand why there is a need for TypeConverters and IValueConverter in WPF. The purpose of both objects is to convert a value to specific type; but why both? Thanks in advance. 回答1: IValueConverter is used only in data-binding scenarios. It allows you to format values before they are displayed in the UI or to parse values from UI controls so that they can be stored in the binding source. an example would be to convert an IsDirty flag to an "*" in the UI or a

问题 I am new to WPF. I just don't understand why there is a need for TypeConverters and IValueConverter in WPF. The purpose of both objects is to convert a value to specific type; but why both? Thanks in advance. 回答1: IValueConverter is used only in data-binding scenarios. It allows you to format values before they are displayed in the UI or to parse values from UI controls so that they can be stored in the binding source. an example would be to convert an IsDirty flag to an "*" in the UI or a

问题 I'm trying to bind SelectedItem in a ListView to the property SelectedSection in the viewmodel. I'm getting the following error: "Invalid binding path 'ViewModel.SelectedSection' : Cannot bind type 'Model.Section' to 'System.Object' without a converter". I'm currently binding the ListView's ItemSource to a list in the CurrentProject property. I tried making a converter, but I'm not quite sure how and what I'm suppose to convert. I got the same error when I tried to just get the property I

问题 What am I missing? I was trying to implement converters to my XAML-based PowerShell script but with no luck. I've picked up pieces of information from sites like StackOverflow. but couldn't find one successful implementation of a converter in powershell XAML-based GUI script. in the code I am testing the converter, and it works (you can see 2 examples for conversion) so that means that powershell itself accepted the new converter type, buy this converter cannot be implemented in my xaml code.

问题 I'm having a simple WPF XAML Window, I need to Create a StaticResource Key with in the following XAML. The XAML Source Code is <Window x:Class="WpfApplication1.Trigger" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:super="clr-namespace:WpfApplication1" Title="Trigger" Height="300" Width="300"> <Grid> <Border x:Name="m_Border" Width="100" Height="30" HorizontalAlignment="Center" VerticalAlignment="Top" Background=

问题 I'm having a simple WPF XAML Window, I need to Create a StaticResource Key with in the following XAML. The XAML Source Code is <Window x:Class="WpfApplication1.Trigger" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:super="clr-namespace:WpfApplication1" Title="Trigger" Height="300" Width="300"> <Grid> <Border x:Name="m_Border" Width="100" Height="30" HorizontalAlignment="Center" VerticalAlignment="Top" Background=

来源： https://stackoverflow.com/questions/58493209/ivalueconverter-and-binding-a-dependencyobject

问题 I have a Xamarin forms application. It has a page. That page has a listview. The listviews is bind to a sourcelist. What I want is to decide what custom control to use based on a specific property that each item in the list has. How can I achieve this? It is also required that the custom control binds to values from the list. I tried the following: <ContentView Content="{Binding IsPriority, Converter={StaticResource RoadIndicatorBackgroundValueConverter}}" ControlText="{Binding TowingOrder

问题 I want to change the color of a WPF control depending on the state of a bool, in this case the state of a checkbox. This works fine as long as I'm working with StaticResources: My control <TextBox Name="WarnStatusBox" TextWrapping="Wrap" Style="{DynamicResource StatusTextBox}" Width="72" Height="50" Background="{Binding ElementName=WarnStatusSource, Path=IsChecked, Converter={StaticResource BoolToWarningConverter}, ConverterParameter={RelativeSource self}}">Status</TextBox> My converter:

问题 I have an extremely simple IMultiValueConverter that simply OR's two values. In the example below, I want to invert the first value using an equally simple boolean inverter. <MultiBinding Converter="{StaticResource multiBoolToVis}"> <Binding Path="ConditionA" Converter="{StaticResource boolInverter}"/> <Binding Path="ConditionB"/> </MultiBinding> and the inverter: public class BoolInverterConverter : IValueConverter { #region IValueConverter Members public object Convert(object value, Type