Datepicker in wpf mvvm

I am new to Xamarin and I have been playing around with data binding. I have a script "Items. The input seems to be working correctly but when I look at the output the values won't update to the selected values. All three values seem to remain at the default DateTime.

Edit: just saw that you already have that in your code. But the corresping property in your model should be TimeSpan for a timepicker, not DateTime. I don't know if TimePicker and DatePicker are "bindable".

If the answer is "Yes", I think you can try to set the BindingMode.

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I just managed to find the "Date" property which is bindable according to the xamarin docs for DatePicker and that seems to be kind of working now. Thanks heaps to both of you. I did some more research on how to be able to display the data using StringFormat. Xamarin Inc. This site uses cookies for analytics, personalized content and ads. By continuing to browse this site, you agree to this use. Learn more.

Xamarin Menu About What is Xamarin? What is Xamarin. March in Xamarin. Hey all, I am new to Xamarin and I have been playing around with data binding.

Tagged: xamarin. Best Answer. March edited March Accepted Answer.Download the sample. The Xamarin. Forms DatePicker invokes the platform's date-picker control and allows the user to select a date. DatePicker defines eight properties:. The DatePicker fires a DateSelected event when the user selects a date. Otherwise, DatePicker will raise an exception.

All eight properties are backed by BindableProperty objects, which means that they can be styled, and the properties can be targets of data bindings. The Date property has a default binding mode of BindingMode.

Parse method with a CultureInfo. InvariantCulture argument to convert the string to a DateTime value. The dates must be specified in a precise format: two-digit months, two-digit days, and four-digit years separated by slashes:. In this example, all three properties are initialized to the corresponding properties in the viewmodel.

Because the Date property has a binding mode of TwoWayany new date that the user selects is automatically reflected in the viewmodel. If the DatePicker does not contain a binding on its Date property, an application should attach a handler to the DateSelected event to be informed when the user selects a new date.

For information about setting font properties, see Fonts. It's possible to use an unconstrained horizontal layout option such as CenterStartor End with DatePicker :. However, this is not recommended. Depending on the setting of the Format property, selected dates might require different display widths.

For example, the "D" format string causes DateTime to display dates in a long format, and "Wednesday, September 12, " requires a greater display width than "Friday, May 4, ". Depending on the platform, this difference might cause the DateTime view to change width in layout, or for the display to be truncated.

These can be used to select two dates, and the program calculates the number of days between those dates. The program doesn't change the settings of the MinimumDate and MaximumDate properties, so the two dates must be between and Each DatePicker is assigned a Format property of "D" for a long date format.

Notice also that the endDatePicker object has a binding that targets its MinimumDate property. The binding source is the selected Date property of the startDatePicker object. This ensures that the end date is always later than or equal to the start date.

datepicker in wpf mvvm

In addition to the two DatePicker objects, a Switch is labeled "Include both days in total". The two DatePicker views have handlers attached to the DateSelected event, and the Switch has a handler attached to its Toggled event. These event handlers are in the code-behind file and trigger a new calculation of the days between the two dates:.The following illustration shows a DatePicker.

DatePicker Control. The following example creates the DatePicker shown in the previous illustration. The DatePicker does the following:. The DatePicker control allows the user to select a date by either typing it into a text field or by using a drop-down Calendar control. Many of a DatePicker control's properties are for managing its built-in Calendarand function identically to the equivalent property in Calendar.

In particular, the DatePicker. IsTodayHighlightedDatePicker. BlackoutDatesDatePicker. DisplayDateStartDatePicker. DisplayDateEndDatePicker. DisplayDateand DatePicker. SelectedDate properties function identically to their Calendar counterparts. For more information, see Calendar. Users can type a date directly into a text field, which sets the Text property. If the DatePicker cannot convert the entered string to a valid date, the DateValidationError event will be raised.

By default, this causes an exception, but an event handler for DateValidationError can set the ThrowException property to false and prevent an exception from being raised. The DatePicker supports only the Gregorian calendar. To apply the same property settings to multiple DatePicker controls, use the Style property.

You can modify the default ControlTemplate to give the control a unique appearance. Dependency properties for this control might be set by the control's default style.

If a property is set by a default style, the property might change from its default value when the control appears in the application. The default style is determined by which desktop theme is used when the application is running.

Setting a visual property only has an effect if that property is both present in the control's default template and is set by using a TemplateBinding. Initializes a new instance of the DatePicker class. Identifies the CalendarStyle dependency property. Identifies the DisplayDateEnd dependency property.

Identifies the DisplayDate dependency property. Identifies the DisplayDateStart dependency property. Identifies the FirstDayOfWeek dependency property. Identifies the IsDropDownOpen dependency property.

datepicker in wpf mvvm

Identifies the IsTodayHighlighted dependency property. Identifies the SelectedDateChanged routed event. Identifies the SelectedDateFormat dependency property. Identifies the SelectedDate dependency property. Identifies the Text dependency property.

Gets or sets a value indicating whether this element can be used as the target of a drag-and-drop operation. This is a dependency property.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Code Review Stack Exchange is a question and answer site for peer programmer code reviews. It only takes a minute to sign up. I've created a UserControl that should act as a control inside a Window :.

The thing I'm most unsure of is the way I use the binding in side my picker. Any comments or suggestions? Bindings between xaml controls and the xaml class Same class which is the parent of those controls. The interactions between xaml controls and xaml code-behind are not supposed to flow through the same MVVM pattern. This is why in the partial class you have the possibility to access directly your controls.

Another drawback could be the usage of some properties from outside of your implementation. Suppose there is some logic which needs to open the popup without a click on the ButtonChangeStatus button but from a click which originates outside of your implementation.

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To achieve such behavior the user of your control would need to bind IsOpen to his DataContext. But in the current implementation it's not possible without a great confusion you need to have two IsOpen dependency properties ; it will be possible by exposing the IsOpen dependency property to the outside ViewModel in the same way as you already did with SelectedDateTime.

Having both a local IsOpen property and a dependency one will allow you to handle the Popup using two sources. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Asked 4 years, 8 months ago. Active 4 years, 8 months ago. Viewed 7k times. Now; switch obj. MinValue return val; return String. TryParse strValue, out resultDateTime? Yoav Yoav 4 4 silver badges 17 17 bronze badges. Active Oldest Votes. Bindings between xaml controls and the xaml class Same class which is the parent of those controls The interactions between xaml controls and xaml code-behind are not supposed to flow through the same MVVM pattern.

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Post as a guest Name. Email Required, but never shown.A DatePicker control is used to create a visual DatePicker that let user to pick a date and fire an event on the selection of the date.

The DatePicker control is defined in the System. Controls namespace. The Content attribute represents the text of a DatePicker. The Name attribute represents the name of the control, which is a unique identifier of a control. When you run this code, you will see a TextBox with text Select a date and when you click on this TextBox or the date, Calendar dropdown will appear where you can select a date.

The selected date will be the date in the TextBox as you can see in Figure 1. The SelectedDate property represents the currently selected date. If multiple dates selection is true, the SelectedDates property represents a collection of currently selected dates. The BlackoutDates property of the DatePicker class represents a collection of dates that are not available for selection.

All non selection dates are marked by a cross. For example, say in March month of yearwe would like to block dates from Jan 1 st to Jan 7 th and then all Sundays and the final DatePicker should look like Figure 2. We can achieve this by adding code listed in Listing 2. As you can see from Listing 3, the BlackoutDates. The first date is the start date of the range and second date is the end date of the date range. If you see Figure 2 in the previous section, you may notice the March month DatePicker display start with March 01, date.

But now what if you want to display dates for March month only? The code listed in Listing 3 makes sure the start date is March 01, and end date is March 31, The current selected date is March By default, Sunday is the first day of week.

If you would like to change it, you use FirstDayOfWeek property. The IsTodayHightlighted property is used to make today highlighted.

Xamarin.Forms DatePicker

SelectedDate property represents the current selected date. If multiple date selection is true, then SelectedDates property represents all selected dates in a DatePicker.

The selected dates in a DatePicker looks like Figure 5 where you can see March 5 th15 thand 25 th have a light blue background and represents the selected dates. If you set selected dates to any of the blockout dates, you will see parser in XAML will through an error like Figure 6.

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Besides the normal control events, the DatePicker control has three events DatePicker related events. The following code snippet sets these three events attributes. Normally, on a date selection, you may want to capture that event and know what the current selected date is. Now how about we add a TextBox control to the page and on the date selection, we are going to set the text of the TextBox to the currently selected date. Text property to the SelectedDate property of the DatePicker control as you can see from code in Listing 5.

A couple of tricks when using the standard WPF .NET 4.0 DatePicker control

Now when you run the application, you will see output looks like Figure 7. When you select a date in the DatePicker, it will be displayed in the Textbox. How about we create a DatePicker control with a border formatting, background, and foreground of the DatePicker?TryParse failed for Spanish.

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It is an American date. The DateTime. Parse method uses the formatting rules of the current culture by default. So you need to tell it to use the en-US culture to be able to parse an en-US style date on a Spanish computer. That's why this works:. Please remember to close your threads by marking helpful posts as answer and then start a new thread if you have a new question.

Please don't ask several questions in the same thread. In Europe I have seen variations like yyyy. Note: This is not trivial as there a number of factors that can change the format other than the language selection. If this is an international app, you should respect the local culture settings on the machine and use that for all controls:. In that way, even switch application language on-the-fly, it still works.

For an example, checking for expire date and empty date field. It requires to define xmal page language in code behind:. This site uses cookies for analytics, personalized content and ads. By continuing to browse this site, you agree to this use. Learn more. Ask a question. Quick access. Search related threads.

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Remove From My Forums. Answered by:. Archived Forums. Sign in to vote.A DatePicker is a control that allows a user to pick a date value. The user picks the date by using ComboBox selection for month, day, and year values. Gets or sets a value that indicates whether the day, month, and year selectors are stacked horizontally or vertically.

Occurs when the input system reports an underlying drag event with this element as the target. Inherited from UIElement. Occurs when the input system reports an underlying drag event with this element as the origin. Occurs when the input system reports an underlying drag event with this element as the potential drop target. Occurs when an otherwise unhandled Hold interaction occurs over the hit test area of this element.

Invoked whenever application code or internal processes such as a rebuilding layout pass call ApplyTemplate.

In simplest terms, this means the method is called just before a UI element displays in your app. Override this method to influence the default post-template logic of a class. Inherited from FrameworkElement. Attaches a binding to a FrameworkElement, using the provided binding object. When you click on any date from the DatePicker control, the program will update the title with that date. We recommend that you execute the above example code and try some of the other properties and events of the DatePicker class.

WPF - Datepicker Advertisements. Previous Page. Next Page. Inherited from UIElement 3 DragLeave Occurs when the input system reports an underlying drag event with this element as the origin.

Inherited from UIElement 4 DragOver Occurs when the input system reports an underlying drag event with this element as the potential drop target. Inherited from UIElement 7 Holding Occurs when an otherwise unhandled Hold interaction occurs over the hit test area of this element. Inherited from DependencyObject 2 FindName Retrieves an object that has the specified identifier name. Inherited from FrameworkElement 3 OnApplyTemplate Invoked whenever application code or internal processes such as a rebuilding layout pass call ApplyTemplate.

Previous Page Print Page. DayVisible Gets or sets a value that indicates whether the day selector is shown. HeaderTemplate Gets or sets the DataTemplate used to display the content of the control's header.

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MonthVisible Gets or sets a value that indicates whether the month selector is shown. Orientation Gets or sets a value that indicates whether the day, month, and year selectors are stacked horizontally or vertically. OrientationProperty Gets the identifier for the Orientation dependency property.

YearVisible Gets or sets a value that indicates whether the year selector is shown. DragEnter Occurs when the input system reports an underlying drag event with this element as the target.

DragLeave Occurs when the input system reports an underlying drag event with this element as the origin. DragOver Occurs when the input system reports an underlying drag event with this element as the potential drop target.

datepicker in wpf mvvm

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