binding

问题 In the following Python code, I get an UnboundLocalError . As I understand it, local functions share the local variables of the containing function, but this hardly seems to be the case here. I recognise that a is an immutable value in this context, but that should not be a problem. def outer(): a = 0 def inner(): a += 1 inner() outer() It would seem that the inner function has received copies of all the references in the parent function, as I do not get the UnboundLocalError exception if the

问题 Actually the issue im facing is slight different than what title says. I try to sumarize the issue below. Class PersonnelViewModel { public SelectedPersonnelItem PersonnelItemViewModel; } Class PersonnelItemViewModel { } Data Context of the View is A whereas the Item source of the data grid is SelectedPersonnelItem which is a B type property in the class A . Now i want to bind the grid column to properties defiend within class A . But its not working as the context of the grid is another

问题 I would like to create a style that makes my cell's content green if positive, red if negative or black if 0. I know about converters and bindings, but is it possible to do this without naming the field the specific column is bound to (eg. I was to base on whatever is the cell's value)? <Style x:Key="GreenIfPositive" TargetType="DataGridCell" BasedOn="{StaticResource {x:Type DataGridCell}}"> <Style.Triggers> <DataTrigger Binding="{Binding, Converter={StaticResource

问题 Im not sure what I am doing wrong here. Lets say, I have two UserControls BoxA and BoxB . Both have a DependencyProperty called Text BoxB wraps BoxA which has a regular TextBox. Binding should work like this BoxB.Text <=> BoxA.Text <=> TextBox.Text Xaml BoxA: <UserControl x:Class="SandBoxWpf.BoxA" 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-compatibility/2006" xmlns

问题 In WPF4.0, I have a class that contains other class types as properties (combining multiple data types for display). Something like: public partial class Owner { public string OwnerName { get; set; } public int OwnerId { get; set; } } partial class ForDisplay { public Owner OwnerData { get; set; } public int Credit { get; set; } } In my window, I have an ItemsControl with the following (clipped for clarity): <ItemsControl ItemsSource={Binding}> <ItemsControl.ItemTemplate> <DataTemplate>

问题 I'm writing small application using JavaFX but I stuck with one problem. I have fxml files: MainPane.fxml Stream.fxml Play.fxml and each of them has its own controller: MainPaneController.java StreamController.java PlayController.java Where in MainPane is: <GridPane fx:controller="model.MainController" fx:id="mainGrid" xmlns:fx="http://javafx.com/fxml" alignment="CENTER" gridLinesVisible="true"> <children> <fx:include source="Stream.fxml"/> </children> <children> <fx:include source="Play.fxml

问题 I've notived that practically every example I find on the internet about bindings has a class (which binds to another property) that inherits the INotifyPropertyChanged interface and uses a method in the set part of the class' property. I've tried removing that part from the binding example and it worked the same as it would with the method. Here's the example. I've altered it so it would be a TwoWay bindingmode and show the changed property in a messagebox. I did that just to play around a

问题 I am trying some different things using MVVM. In our ViewModel properties which are bind to View are public. I am taking example of a button binding. Here is a simple sample. View.xaml: <Button Content="Test Button" Command="{Binding TestButtonCommand}" /> ViewModel.cs private ICommand _testButtonCommand; public ICommand TestButtonCommand { get { return _testButtonCommand?? (_testButtonCommand= new RelayCommand(SomeMethod)); } } Here my question is that can we make TestButtonCommand internal

问题 I am using the cbind command in R to bind many data.frames together and each data frame has the same column names so when I bind them all, R automatically changes the column names from their original names. For example, there is a column named "X" so for each binding it renames this X.1, X.2, X.3 etc. Is there a way for me to bind them without changing any of the column names and have multiple columns with the same name? The reason I wish to do this is so I can sort the combined data.frame

问题 is it possible to bind the Path property of a binding to another property? I want to realize this code: Text="{Binding Path={Binding Path=CurrentPath}}" So I can adjust dynamically to which Property my actual binding is refering. Thanks for your Help Jonny 回答1: As other posters have mentioned, you can only set a binding on a dependency property - which path is not. The underlying reason is that xaml is source code that gets compiled. At compile time the compiler has no idea what the value of