BindingGroup.ValidationRules Właściwość

Definicja

Pobiera kolekcję ValidationRule obiektów, które weryfikują obiekty źródłowe BindingGroupw.Gets a collection of ValidationRule objects that validate the source objects in the BindingGroup.

public:
 property System::Collections::ObjectModel::Collection<System::Windows::Controls::ValidationRule ^> ^ ValidationRules { System::Collections::ObjectModel::Collection<System::Windows::Controls::ValidationRule ^> ^ get(); };
public System.Collections.ObjectModel.Collection<System.Windows.Controls.ValidationRule> ValidationRules { get; }
member this.ValidationRules : System.Collections.ObjectModel.Collection<System.Windows.Controls.ValidationRule>
Public ReadOnly Property ValidationRules As Collection(Of ValidationRule)

Wartość właściwości

Kolekcja ValidationRule obiektów, które weryfikują obiekty źródłowe BindingGroupw.A collection of ValidationRule objects that validate the source objects in the BindingGroup.

Przykłady

Poniższy przykład dodaje niestandardowe ValidationRule, ValidateDateAndPricedo BindingGroup.The following example adds the custom ValidationRule, ValidateDateAndPrice, to the BindingGroup.

<StackPanel.BindingGroup>
  <BindingGroup NotifyOnValidationError="True">
    <BindingGroup.ValidationRules>
      <src:ValidateDateAndPrice ValidationStep="ConvertedProposedValue" />
    </BindingGroup.ValidationRules>
  </BindingGroup>
</StackPanel.BindingGroup>

W poniższym przykładzie pokazano ValidateDateAndPrice klasę.The following example shows the ValidateDateAndPrice class. Validate MetodaBindingGroup używa do uzyskania wartości wprowadzonych przez użytkownika w formularzu i sprawdza, czy jeśli element jest ponad 100 dolarów, będzie dostępny przez co najmniej siedem dni.The Validate method uses the BindingGroup to get the values the user entered into the form, and checks that if an item is over 100 dollars, it will be available for at least seven days.

public class ValidateDateAndPrice : ValidationRule
{
    // Ensure that an item over $100 is available for at least 7 days.
    public override ValidationResult Validate(object value, CultureInfo cultureInfo)
    {
        BindingGroup bg = value as BindingGroup;

        // Get the source object.
        PurchaseItem item = bg.Items[0] as PurchaseItem;
        
        object doubleValue;
        object dateTimeValue;

        // Get the proposed values for Price and OfferExpires.
        bool priceResult = bg.TryGetValue(item, "Price", out doubleValue);
        bool dateResult = bg.TryGetValue(item, "OfferExpires", out dateTimeValue);

        if (!priceResult || !dateResult)
        {
            return new ValidationResult(false, "Properties not found");
        }

        double price = (double)doubleValue;
        DateTime offerExpires = (DateTime)dateTimeValue;

        // Check that an item over $100 is available for at least 7 days.
        if (price > 100)
        {
            if (offerExpires < DateTime.Today + new TimeSpan(7, 0, 0, 0))
            {
                return new ValidationResult(false, "Items over $100 must be available for at least 7 days.");
            }
        }

        return ValidationResult.ValidResult;
    }
}
Public Class ValidateDateAndPrice
    Inherits ValidationRule
    ' Ensure that an item over $100 is available for at least 7 days.
    Public Overrides Function Validate(ByVal value As Object, ByVal cultureInfo As CultureInfo) As ValidationResult
        Dim bg As BindingGroup = TryCast(value, BindingGroup)

        ' Get the source object.
        Dim item As PurchaseItem = TryCast(bg.Items(0), PurchaseItem)

        Dim doubleValue As Object = Nothing
        Dim dateTimeValue As Object = Nothing

        ' Get the proposed values for Price and OfferExpires.
        Dim priceResult As Boolean = bg.TryGetValue(item, "Price", doubleValue)
        Dim dateResult As Boolean = bg.TryGetValue(item, "OfferExpires", dateTimeValue)

        If (Not priceResult) OrElse (Not dateResult) Then
            Return New ValidationResult(False, "Properties not found")
        End If

        Dim price As Double = CDbl(doubleValue)
        Dim offerExpires As Date = CDate(dateTimeValue)

        ' Check that an item over $100 is available for at least 7 days.
        If price > 100 Then
            If offerExpires < Date.Today + New TimeSpan(7, 0, 0, 0) Then
                Return New ValidationResult(False, "Items over $100 must be available for at least 7 days.")
            End If
        End If

        Return ValidationResult.ValidResult

    End Function
End Class

Uwagi

Gdy jest dodawany BindingGroupdo, BindingGroup jest Validate przenoszona jako pierwszy parametr metody. ValidationRuleWhen a ValidationRule is added to a BindingGroup, the BindingGroup is passed in as the first parameter of the Validate method. Proponowane wartości obiektu można uzyskać za pomocą TryGetValue metody lub. GetValue(Object, String)You can get the proposed values of the object by using the TryGetValue or GetValue(Object, String) method. Można uzyskać obiekty, które są źródłami powiązań z Items właściwości.You can get the objects that are the sources of the bindings from the Items property.

Dotyczy