There are times when there could be a number of RadioButton controls, and after the containing Control loses Visibilityit is desirable that none of the RadioButton controls be selected.
This can be done usually in the associated ViewModelbut it could be easier just to have the controls reset automatically, sort of like when you initially create a Viewthen any contained RadioButton is false unless the ViewModel has set it to trueand the ViewModel will also have the default of false for any property, including those associated with a RadioButton IsChecked property.
There is a single bool EnableProperty DependencyProperty that is set to true to enable the behavior. When the e. I have included the private method FindVisualChildren in the behavior for probability, but more than likely would want to put this code in a separate class within the solution for utility code. To use the sample, you just have to click the ToggleButton on the Window so that RadioButton controls within a StackPanel to which this behavior is attached are visible, then can select any number of the RadioButton controls which results in exactly one of them being set.
Hide and show the RadioButton controls using the ToggleButton. Using this behavior is like any other behavior, the behavior is included in the XAML for the parent or grandparent, or any other ancestor Control containing RadioButton controls.
Its Enable property just has to be set to true :. This is quite a stupid design since all instances of RadioButton controls within the Control that this behavior is attached will be reset. This could be considered a good or bad thing because the way a group of RadioButton controls act is that checking a RadioButton will only reset those RadioButton controls directly within the same container.
However, if it is desired to reset one group of contained RadioButton controls, then likely that want to reset all.
This behavior affects RadioButton controls but could also be very easily modified to work on CheckBox or ToggleButton controls.Handy Tricks and Tips to do your.
Some common questions that comes into mind. Please check if you could find them listed or not. Post a Comment Please make sure that the question you ask is somehow related to the post you choose.
Otherwise you post your general question in Forum section. Client App Dev. Codeproject MVP. Codeproject Associate. Dotnetfunda MVP. Posted by Unknown on Tuesday, March 22, Well, if you are working with WPF or silverlight, and in VSI think you would have definitely found this issue or will find it sooner.
Binding is the concept which lets you to update the control whenever the underlying data object is modified and vice versa. Most of the controls works great with Binding and hence can easily be used with MVVM pattern, but RadioButton has serious issue with it.
How to handle Radio Buttons in WPF with MVVM
In this post I will describe the problem with Radios and define some of the ways to solve it. Radio1 : this. Radio2; return string. Now lets bind the elements in XAML.
The common group will automatically unselect one element when another is selected. Each of the RadioButton is bound to their individual properties, so that when one button is UnChecked the underlying property will be set to false. Now there is a serious issue with this in WPF 3. Its a known bug in the system, which removes the Bindings altogether whenever RadioButton is used with common groups.
Just run this code in WPF 3. The problem actually happens as the control is going to literally set the IsChecked property of all other RadioButtons in the same group when you click on one RadioButton. IsCheck is set.
And hence removes the existing Binding on the Control. Newer Post Older Post Home. Author's new book Abhishek authored one of the best selling book of.
After reviewing other posts, it appears that the IsChecked property simply doesn't work. I have put together a short demo that reproduces the problem, which I have included below. Additional information: The IsChecked property doesn't work for two reasons:. When a button is selected, the IsChecked properties of other buttons in the group don't get set to false.
When a button is selected, its own IsChecked property does not get set after the first time the button is selected. I am guessing that the binding is getting trashed by WPF on the first click. Demo project: Here is the code and markup for a simple demo that reproduces the problem.
Create a WPF project and replace the markup in Window1. To reproduce the problem, run the app and click Button A. A message box will appear, saying that Button A's IsChecked property has been set to true. Now select Button B. Another message box will appear, saying that Button B's IsChecked property has been set to truebut there is no message box indicating that Button A's IsChecked property has been set to false --the property hasn't been changed.
Now click Button A again. The button will be selected in the window, but no message box will appear--the IsChecked property has not been changed. Finally, click on Button B again--same result. The IsChecked property is not updated at all for either button after the button is first clicked.
If you start with Jason's suggestion then the problem becomes a single bound selection from a list which translates very nicely to a ListBox. At that point it's trivial to apply styling to a ListBox control so that it shows up as a RadioButton list.
Looks like they fixed binding to the IsChecked property in. NET 4. A project that was broken in VS works in VS For the benefit of anyone researching this question down the road, here is the solution I ultimately implemented.
It builds on John Bowen's answer, which I selected as the best solution to the problem. First, I created a style for a transparent list box containing radio buttons as items. Then, I created the buttons to go in the list box--my buttons are fixed, rather than read into the app as data, so I hard-coded them into the markup.
I use an enum called ListButtons in the view model to represent the buttons in the list box, and I use each button's Tag property to pass a string value of the enum value to use for that button.Implicitly set the theme of the project to a windows 8 Metro styled theme for Windows 7 and 8 using MahApps You will find this. I am creating this article, because when I was looking for a similar concept i struggled and saw a lot of people were creating their own convertors and basically seemed like a very heavy and tacky approach to handling the same selected functionality as WinForms offers for Radio Buttons.
I use a ListBox control to handle the logic so I can them just bind the IsChecked to the parent's IsSelected property that way you can only have a single selected object at a time. Implicitly setting the theme is pretty simple in your App. There are also two themes you can set either: BaseDark or BaseLight. Now you set your Window tag to con:MetroWindow and then do the same on the code behind. Your code behind on the end product if you are using the MVVM pattern should always look like the following.
Create a basic model for the properties you would want your selected Radio Button to have my example just has a Header and ToolTip. I am not going to go into detail on the ViewModel for this article as you can go through it in the attached source code.A Radio Button is a control that allows a user to select a single option from a group of options.
The user is limited to select a single option from a related list of options which are mutually exclusive. Gets or sets a value that indicates when the Click event occurs, in terms of device behavior. Inherited from ButtonBase.
Gets or sets the data template that is used to display the content of the ContentControl. Inherited from ContentControl. Gets or sets the horizontal alignment characteristics that are applied to a FrameworkElement when it is composed in a layout parent, such as a panel or items control. Inherited from FrameworkElement. Gets or sets a value indicating whether the user can interact with the control.
Inherited from Control. Gets a value that indicates whether a ButtonBase is currently in a pressed state.WPF C# CheckBox and RadioButton
Gets or sets a value that indicates whether the control supports three states. Inherited from ToggleButton.
Gets or sets the identifying name of the object. Gets the locally defined resource dictionary. Resources property element, through XAML implicit collection syntax. Gets or sets an instance Style that is applied for this object during layout and rendering. Gets or sets a control template.
Gets or sets the vertical alignment characteristics that are applied to a FrameworkElement when it is composed in a parent object such as a panel or items control.
Gets or sets the visibility of a UIElement. A UIElement that is not visible is not rendered and does not communicate its desired size to layout.
Working with WPF RadioButton using C# and XAML
Inherited from UIElement. Invoked whenever application code or internal processes such as a rebuilding layout pass call ApplyTemplate.The RadioButton control has its name from old analog radios which had a number of programmable station buttons. When you pushed one in, the previosly selected poped out. So only one station can be selected at a time. The RadioButton control has the same behavior. It lets the user choose one option out of a few.
It the list of options gets longer, you should prefer a combo or list box instead. To define which RadioButtons belong togehter, you have to set the GroupName to the same name. To preselect one option set the IsChecked property to True.
The radio button control has a known issue with data binding. But when you check another RadioButton, the databound value still remains true. The reason for this is, that the Binding gets lost during the unchecking, because the controls internally calls ClearValue on the dependency property. NET 4. ToString ; return checkValue.
Equals targetValue, StringComparison. ToString ; if useValue return Enum. Radio Button Introduction The RadioButton control has its name from old analog radios which had a number of programmable station buttons. Comments on this article Show all comments.
WPF Behavior to Reset RadioButtons on VisibilityChanged
Commented on 8. March Thank you, this example is just what I needed and nothing more. The people who don't understand need more background reading. Perhaps read about MVVM so the binding, converter make sense.
Commented on This tutorial is worth pure gold! Just what I needed. Commented on 2. April Very good!
May Amazaed to see so many dumb People. They are reading this and they dont know what data binding is.A RadioButton is usually used in a group with multiple options where one must be selected. The Width and Height properties represent the width and the height of a RadioButton. The Name property represents the name of the control, which is a unique identifier of a control.
The Margin property tells the location of a RadioButton on the parent control. The HorizontalAlignment and VerticalAlignment properties specify the horizontal and vertical alignments.
The Background and Foreground properties represent the background and foreground colors ofa RadioButton. The following code snippet sets the name, height, and width of a RadioButton control. The code also sets the horizontal alignment to the left and the vertical alignment to the top. Only one RadioButton can be in the selected states at once and by selecting a new RadioButton unselects the previous selected RadioButton.
The output looks as in Figure 2. If you select one RadioButton then the previous RadioButton will be unselected. The RadioButton control has the Checked event as the default event and raised when you check a radio button. The following code snippet adds the event handler. The following checked event handler sets the foreground and background colors of the checked RadioButton and sets black and white for the rest of them.
The following code snippet on a button click event handler finds the text of the selected RadioButton in a group. Alternatively, you may want to replace the "if. View All. Mahesh Chand Updated date, Dec 09 WPF RadioButton. Next Recommended Article. Getting Started With.
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