NotifyParentPropertyAttribute(Boolean) 建構函式

定義

命名空間:

System.ComponentModel

組件:

System.ComponentModel.Primitives.dll

來源:

NotifyParentPropertyAttribute.cs

初始化 NotifyParentPropertyAttribute 類別的新執行個體，使用指定的值判斷是否要在屬性值變更時告知父代屬性。

public:
 NotifyParentPropertyAttribute(bool notifyParent);

public NotifyParentPropertyAttribute (bool notifyParent);

new System.ComponentModel.NotifyParentPropertyAttribute : bool -> System.ComponentModel.NotifyParentPropertyAttribute

Public Sub New (notifyParent As Boolean)

參數

notifyParent

Boolean

如果變更時應該告知父代，則為 true，否則為 false。

範例

下列程式代碼範例示範如何使用 NotifyParentPropertyAttribute 和 ExpandableObjectConverter 類別，在自定義控件上建立可展開的屬性。

[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

另請參閱

• ExpandableObjectConverter