ValidationStep ValidationStep ValidationStep ValidationStep Enum

定義

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
継承
ValidationStepValidationStepValidationStepValidationStep

フィールド

CommittedValue CommittedValue CommittedValue 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 ConvertedProposedValue ConvertedProposedValue 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 RawProposedValue RawProposedValue 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 UpdatedValue UpdatedValue 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、というValidateDateAndPrice名前の検証規則を使用します。The following example uses a validation rule named ValidateDateAndPrice. このValidationRule.ValidationStep規則のは、実行ValidationRule.ValidateConvertedProposedValueに、メソッドがソースプロパティの型の値にアクセスできるようにに設定されています。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.

RawProposedValue ValidationRule.Validate ValidationRule.ValidationStepルールとPriceIsAPositiveNumber FutureDateRuleルールを実行すると、の既定値はであるため、各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"
            Loaded="stackPanel1_Loaded"
            Validation.Error="ItemError">

  <StackPanel.Resources>
    <Style TargetType="HeaderedContentControl">
      <Setter Property="Margin" Value="2"/>
      <Setter Property="Focusable" Value="False"/>
      <Setter Property="Template">
        <Setter.Value>
          <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"/>
            </DockPanel>

          </ControlTemplate>
        </Setter.Value>
      </Setter>
    </Style>

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

    </Style>

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

検証規則のValidateDateAndPrice例を次に示します。The following example shows the ValidateDateAndPrice validation rule. DateTime OfferExpires Doubleメソッドでは、プロパティは型で、プロパティは型です。Price ValidationRule.ValidateIn 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、のValidationRule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

適用対象