NotifyParentPropertyAttribute(Boolean) Costruttore

  • Riferimento

Definizione

Spazio dei nomi:
System.ComponentModel
Assembly:
System.ComponentModel.Primitives.dll
Assembly:
System.dll
Assembly:
netstandard.dll
Source:
NotifyParentPropertyAttribute.cs
Source:
NotifyParentPropertyAttribute.cs
Source:
NotifyParentPropertyAttribute.cs

Consente di inizializzare una nuova istanza della classe NotifyParentPropertyAttribute utilizzando il valore specificato per determinare se alla proprietà padre verranno notificate le modifiche apportate al valore della proprietà.

public:
 NotifyParentPropertyAttribute(bool notifyParent);
public NotifyParentPropertyAttribute (bool notifyParent);
new System.ComponentModel.NotifyParentPropertyAttribute : bool -> System.ComponentModel.NotifyParentPropertyAttribute
Public Sub New (notifyParent As Boolean)

Parametri

notifyParent
Boolean

true se la proprietà padre deve ricevere notifica delle modifiche, in caso contrario false.

Esempio

Nell'esempio di codice seguente viene illustrato come usare NotifyParentPropertyAttribute e la ExpandableObjectConverter classe per creare una proprietà espandibile in un controllo personalizzato.

[TypeConverter(typeof(BorderAppearanceConverter))]
public class BorderAppearance
{
    private int borderSizeValue = 1;
    private Color borderColorValue = Color.Empty;

    [Browsable(true),
    NotifyParentProperty(true),
    EditorBrowsable(EditorBrowsableState.Always),
    DefaultValue(1)]
    public int BorderSize
    {
        get
        {
            return borderSizeValue;
        }
        set
        {
            if (value < 0)
            {
                throw new ArgumentOutOfRangeException(
                    "BorderSize",
                    value,
                    "must be >= 0");
            }

            if (borderSizeValue != value)
            {
                borderSizeValue = value;
            }
        }
    }

    [Browsable(true)]
    [NotifyParentProperty(true)]
    [EditorBrowsable(EditorBrowsableState.Always)]
    [DefaultValue(typeof(Color), "")]
    public Color BorderColor
    {
        get
        {
            return borderColorValue;
        }
        set
        {
            if (value.Equals(Color.Transparent))
            {
                throw new NotSupportedException("Transparent colors are not supported.");
            }

            if (borderColorValue != value)
            {
                borderColorValue = value;
            }
        }
    }
}

<TypeConverter(GetType(BorderAppearanceConverter))>  _
Public Class BorderAppearance
    Private borderSizeValue As Integer = 1
    Private borderColorValue As Color = Color.Empty
    
    
    <Browsable(True), NotifyParentProperty(True), EditorBrowsable(EditorBrowsableState.Always), DefaultValue(1)>  _
    Public Property BorderSize() As Integer 
        Get
            Return borderSizeValue
        End Get
        Set
            If value < 0 Then
                Throw New ArgumentOutOfRangeException("BorderSize", value, "must be >= 0")
            End If
            
            If borderSizeValue <> value Then
                borderSizeValue = value
            End If
        End Set
    End Property
    
    
    <Browsable(True), NotifyParentProperty(True), EditorBrowsable(EditorBrowsableState.Always), DefaultValue(GetType(Color), "")>  _
    Public Property BorderColor() As Color 
        Get
            Return borderColorValue
        End Get
        Set
            If value.Equals(Color.Transparent) Then
                Throw New NotSupportedException("Transparent colors are not supported.")
            End If
            
            If borderColorValue <> value Then
                borderColorValue = value
            End If
        End Set
    End Property
End Class

Si applica a

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