datatrigger

问题 I use a data trigger to control some storyboards, but it only can be trigger one time. <Style x:Key="PropertyTriggerExampleButtonStyle" TargetType="{x:Type Button}"> <Setter Property="Width" Value="200" /> <Style.Triggers> <DataTrigger Binding="{Binding para}" Value="0"> <DataTrigger.EnterActions> <BeginStoryboard> <Storyboard> <DoubleAnimation Storyboard.TargetProperty="Width" To="500" Duration="0:0:1" /> </Storyboard> </BeginStoryboard> </DataTrigger.EnterActions> </DataTrigger>

问题 I would like to combine the DisplayNames from two different ViewModels, but only IF the first is not equal to a NullObject. I could easily do this in either a converter or a parent view model, but am hoping my attempt at using DataTrigger has an easy fix. Cheers, Berryl This displays nothing at all: <TextBlock Grid.Column="2" Grid.Row="0" > <TextBlock.Inlines> <Run Text="{Binding HonorificVm.DisplayName}"/> <Run Text="{Binding PersonNameVm.DisplayName}"/> </TextBlock.Inlines> <TextBlock.Style

问题 I have a table Product and another table ProductLog . The log table needs to track two columns in the Product table. Each time there is an insert, update or delete on those columns I need to update the log table. Do I need to write three separate triggers, or can one trigger handle these operations? I also need to know the type of operation, for example I will need to know if the entry in the log table was because of insert or delete or update. If any one give me an example that would be

问题 Let's say I have the following simple classes: public class Person { public int Id { get; set; } public string Name { get; set; } } public class PersonHolder { public Person CurrentPerson { get; set; } public int ActiveId { get; set; } } Now I have a grid with an instance of class PersonHolder as DataContext , and in the grid I have a StackPanel which is bound to the CurrentPerson of PersonHolder - showing its data: <Grid> <StackPanel x:Name="PersonPanel" DataContext="{Binding CurrentPerson}"

问题 I'm trying to execute an animation on a cell in a datagrid when the value of the datagrid cell changes. The datagrid itself is bound to an ObservableCollection of plain old CLR objects. In this case lets say the objects are 'Person' objects with properties for 'Firstname', 'Lastname' and 'Age'. The 'Person' class implements the INotifyPropertyChanged interface and each property has the appropriate call to onPropertyChanged in it's setter. This is all fine. In the datagrid definition I've set

问题 I'm trying to convert old Window phone 7.5 Silverlight Application to new WinRT Universal application and I have problems with this pice of code: <Style TargetType="Button"> <Setter Property="Visibility" Value="Collapsed"/> <Style.Triggers> <DataTrigger Binding="{Binding Active}" Value="True"> <Setter Property="Visibility" Value="Visible"/> </DataTrigger> </Style.Triggers> </Style> I used DataTrigger to set visibility of control based on binding value. In Windows Phone 8.1 winrt app this

问题 see below XAML : <Window x:Class="TabControl.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:TabControl" Title="MainWindow" Height="300" Width="300" xmlns:Interact="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity" DataContext="{Binding RelativeSource={RelativeSource Mode=Self}}" > <Window.Resources> <Style TargetType="{x:Type DataGridRow}" x:Key=

问题 I have a listbox that displays Shipment Items (custom class) that are formatted using a datatemplate (see below). There is a border element in the template (I am calling it a Gem) that displays which item is active (not selected) which will be the item to which products will be added. template.png There is a boolean property in the shipment class (Active) which is set in a click event handler for the Gem element. Normally the Gem is supposed to be dark as in the first image, then lit when

问题 In the answers on this case it was suggested that I should not use cursor because of performance reasons. What are the best practices to loop over the update data in an update trigger ? UPDATE: The following is the TSQL for the creation of that update trigger. CREATE TRIGGER [dbo].[trAfterUpdateInfoDoc] ON [dbo].[InfoDocs] AFTER UPDATE AS BEGIN DECLARE @infodoctemplateid INT; DECLARE @infodocid INT; DECLARE @requireccount FLOAT(2); DECLARE @filledcount FLOAT(2); DECLARE @pcnt FLOAT(2);

问题 I designed a WPF Page and it should be possible to change the theme (dark theme and light theme). I am a newbie in WPF and found a solution to my problem using DataTrigger, but it don't works. 3 hours later I tried like 10 different solutions/tutorials but I don't know what I am doing wrong... The xml code: <Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup