binding

问题 I was wondering if it is possible to hide a control on a view if the property to which the control is bound does not exist in the view model. For example, if I have the following: <CheckBox Content="Quote" IsChecked="{Binding Path=IsQuoted}" /> Can I detect in XAML that the IsQuoted property does not exist on the view model, and simply hide the control in that instance. I am essentially creating a wizard dialog that moves through a collection of view models, displaying the associated view for

问题 Can not do Binding Random (MyViewModel) -> VMTestValue (MyViewModel) -> TestUserControl (MainWindow) "MyViewModel" is ViewModel for "MainWindow" All project: http://rusfolder.com/32608140 TestUserControl.xaml <UserControl x:Class="TestBinding.TestUserControl" 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:d="http://schemas.microsoft.com

问题 Well I was wondering how to bind a boolean property to a combobox.Combobox will be a yes/no combobox. 回答1: You could use a ValueConverter to convert the boolean value to a ComboBox index and back. Like this: public class BoolToIndexConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { return ((bool)value == true) ? 0 : 1; } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) {

问题 I'm going bonkers with the following WPF DataGrid+ComboBox scenario. I have a set of classes which look like; class Owner { int ID { get; } string Name { get; } public override ToString() { return this.Name; } } class House { int ID { get; } Owner HouseOwner { get; set; } } class ViewModel { ObservableCollection<Owner> Owners; ObservableCollection<House> Houses } Now my desired outcome is a DataGrid which shows a list of rows of type House , and in one of the columns, is a ComboBox which

问题 I am trying to bind a dictionary's key to a row of the grid in a listbox, and bind the dictionary's value to another row of the grid. key's type is Book, a class thati wrote and the value's type is int. i want to write the elements of the class and the integer value in grid. Can you help me on this? I'm quite confused on determining the itemsSource and the data type to bind. thanks for helping Edit: i forgot to say that i am using c# - wpf. =) I sent the dictionary as the itemsSource, and i

问题 First; the question is rhetorical, I have an answer! I have gotten so much help from looking here that I wanted to give this neat trick back. Imagine that you have a value that you want to bind to, but it is somehow or somewhat wrong. I had a situation where I wanted to bind to a value, but when the value was 1, I needed 0, and vice-versa. There was a time when I wanted to bind the width of an element to the width of a parent - 68px. 回答1: Enter the FirstDegreeFunctionConverter : using System;

问题 I have an ItemsControl that displays a bunch of rectangles. Each rectangle needs to be offset upward and to the left. So, I created a RectangleStyle that uses bindings to set the width, height, X translation, and Y translation for a rectangle. The width and height bindings are working fine, but I'm getting the following error for the TranslateTransform bindings: System.Windows.Data Error: 2 : Cannot find governing FrameworkElement or FrameworkContentElement for target element.

问题 I have a WPF xaml file describing a section of a GUI and I'd like the enabling/disabling of a particular control to be dependent on two others. The code looks something like this at the moment: <ComboBox Name="MyComboBox" IsEnabled="{Binding ElementName=SomeCheckBox, Path=IsChecked}"/> But I'd like it to be dependant on another checkbox as well so something like: <ComboBox Name="MyComboBox" IsEnabled="{Binding ElementName=SomeCheckBox&AnotherCheckbox, Path=IsChecked}"/> What's the best way to

问题 I'm a little bit lost with bindings. I tried so many things in the last hour, I cannot enumerate all of them. I have an issue with a contextMenu inside a DataTemplate. To explain: I have a UserControl . Its dataContext is itself. Inside this UserControl , I have an ItemsControl to represent a list of Hyperlink. My ItemsControl itemsSource is bound (it is composed of objects elements). I redefined ItemsControl.ItemTemplate . Inside, I create a HyperLink, with TextBlock as child to make it work

问题 My output window does not show binding errors for my project. However on a colleagues machine, binding errors are displayed in the output window. Any ideas on how to switch this on on my machine (the source code is identical on both machines so I'm guessing it is an IDE setting). 回答1: Try Tools -> Options -> Debugging -> Output Window -> WPF Trace Settings -> Data Binding 回答2: I had the same problem and making the appropriate changes (Tools -> Options -> Debugging -> Output Window -> WPF