Skip to main content

DevExpress v24.2 Update — Your Feedback Matters

Our What's New in v24.2 webpage includes product-specific surveys. Your response to our survey questions will help us measure product satisfaction for features released in this major update and help us refine our plans for our next major release.

Take the survey Not interested

DxCalendar<T>.SelectedDatesExpression Property

Specifies a lambda expression that identifies the SelectedDates property’s bound value when the Calendar is placed in the EditForm.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v24.2.dll

NuGet Package: DevExpress.Blazor

#Declaration

C#
[Parameter]
public Expression<Func<IEnumerable<T>>> SelectedDatesExpression { get; set; }

#Property Value

Type Description
Expression<Func<IEnumerable<T>>>

A lambda expression that identifies the bound value.

#Remarks

You can add the Calendar to Blazor’s standard EditForm component to validate the SelectedDates property value. In this case, the SelectedDatesExpression property is used to obtain metadata about the value bound to the SelectedDates property.

You should specify the SelectedDatesExpression property if you handle the SelectedDatesChanged event and cannot use two-way binding.

Razor
<DxCalendar SelectedDates="@SelectedDates"
            SelectedDatesExpression="@(() => SelectedDates)"
            SelectedDatesChanged="@((IEnumerable<DateTime> newValue) => SelectedDatesChanged(newValue))">
</DxCalendar>

@code {
    List<DateTime> SelectedDates = new List<DateTime>();
    // ...
    void SelectedDatesChanged(IEnumerable<DateTime> selectedDates) {
        // ...
    }
}

The SelectedDatesExpression property is set internally if you use the @bind attribute for the SelectedDates property to implement two-way binding.

Razor
<DxCalendar @bind-SelectedDates="@SelectedDates">
</DxCalendar>

@code {
    List<DateTime> SelectedDates = new List<DateTime>();
    // ...
}

The following exception occurs if you do not use two-way binding or the SelectedDatesExpression property:

DevExpress.Blazor.DxCalendar requires a value for the ‘SelectedDatesExpression’ property. It is specified automatically when you use two-way binding (‘bind-SelectedDates’).

See Also