ValidationStep 列挙型


ValidationRule を実行するタイミングを指定します。Specifies when a ValidationRule runs.

public enum class ValidationStep
public enum ValidationStep
type ValidationStep = 
Public Enum ValidationStep


CommittedValue 3

値がソースにコミットされた後で ValidationRule を実行します。Runs the ValidationRule after the value has been committed to the source.

ConvertedProposedValue 1

値が変換された後で ValidationRule を実行します。Runs the ValidationRule after the value is converted.

RawProposedValue 0

変換が行われる前に ValidationRule を実行します。Runs the ValidationRule before any conversion occurs.

UpdatedValue 2

ソースの更新後に ValidationRule を実行します。Runs the ValidationRule after the source is updated.

次の例では、ValidateDateAndPriceという名前の検証規則を使用します。The following example uses a validation rule named ValidateDateAndPrice. この規則の ValidationRule.ValidationStepConvertedProposedValue に設定されているので、実行時には、ValidationRule.Validate メソッドがソースプロパティの型の値にアクセスできます。The ValidationRule.ValidationStep for this rule is set to ConvertedProposedValue so that when it runs, the ValidationRule.Validate method has access to values that are of the source property's type.

PriceIsAPositiveNumber および FutureDateRule のルールを実行すると、ValidationRule.ValidationStep の既定値が RawProposedValueため、各 ValidationRule.Validate メソッドの値は文字列になります。When the PriceIsAPositiveNumber and FutureDateRule rules run, the values in each ValidationRule.Validate method are strings because the default value of ValidationRule.ValidationStep is RawProposedValue. したがって、ルールは、値がそれぞれの型に変換される前に実行されます。Therefore, the rules run before the values are converted to their respective types.

<StackPanel Name="stackPanel1"  Margin="10" Width="250"

    <Style TargetType="HeaderedContentControl">
      <Setter Property="Margin" Value="2"/>
      <Setter Property="Focusable" Value="False"/>
      <Setter Property="Template">
          <ControlTemplate TargetType="HeaderedContentControl">
            <DockPanel LastChildFill="False">
              <ContentPresenter ContentSource="Header" DockPanel.Dock="Left" Focusable="False" VerticalAlignment="Center"/>
              <ContentPresenter ContentSource="Content" Margin="5,0,0,0" DockPanel.Dock="Right" VerticalAlignment="Center"/>


    <Style TargetType="Button">
      <Setter Property="Width" Value="100"/>
      <Setter Property="Margin" Value="10,15,15,15"/>


    <BindingGroup NotifyOnValidationError="True">
        <src:ValidateDateAndPrice ValidationStep="ConvertedProposedValue" />
  <TextBlock FontSize="14" Text="Enter an item for sale"/>
  <HeaderedContentControl Header="Description">
    <TextBox Width="150" Text="{Binding Path=Description, Mode=TwoWay}"/>
  <HeaderedContentControl Header="Price">
    <TextBox Name="priceField"  Width="150">
        <Binding Path="Price" Mode="TwoWay" >
  <HeaderedContentControl Header="Date Offer Ends">
    <TextBox Name="dateField" Width="150" >
        <Binding Path="OfferExpires" StringFormat="d" >
  <StackPanel Orientation="Horizontal">
    <Button IsDefault="True" Click="Submit_Click">_Submit</Button>
    <Button IsCancel="True" Click="Cancel_Click">_Cancel</Button>
  <HeaderedContentControl Header="Description">
    <TextBlock Width="150" Text="{Binding Path=Description}"/>
  <HeaderedContentControl Header="Price">
    <TextBlock Width="150" Text="{Binding Path=Price, StringFormat=c}"/>
  <HeaderedContentControl Header="Date Offer Ends">
    <TextBlock Width="150" Text="{Binding Path=OfferExpires, StringFormat=d}"/>

次の例は、ValidateDateAndPrice 検証規則を示しています。The following example shows the ValidateDateAndPrice validation rule. ValidationRule.Validate メソッドでは、Price プロパティの型は Doubleで、OfferExpires プロパティの型は DateTimeです。In the ValidationRule.Validate method, the Price property is of type Double, and the OfferExpires property is of type DateTime. これらの文字列は、ValidationRule の実行時にそれぞれの型に変換されています。The strings have been converted to their respective types by the time the ValidationRule runs.

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