AmbientValueAttribute Costruttori

public:
 AmbientValueAttribute(bool value);

public AmbientValueAttribute(bool value);

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

Public Sub New (value As Boolean)

Parametri

public:
 AmbientValueAttribute(System::Byte value);

public AmbientValueAttribute(byte value);

new System.ComponentModel.AmbientValueAttribute : byte -> System.ComponentModel.AmbientValueAttribute

Public Sub New (value As Byte)

Parametri

public:
 AmbientValueAttribute(char value);

public AmbientValueAttribute(char value);

new System.ComponentModel.AmbientValueAttribute : char -> System.ComponentModel.AmbientValueAttribute

Public Sub New (value As Char)

Parametri

public:
 AmbientValueAttribute(double value);

public AmbientValueAttribute(double value);

new System.ComponentModel.AmbientValueAttribute : double -> System.ComponentModel.AmbientValueAttribute

Public Sub New (value As Double)

Parametri

public:
 AmbientValueAttribute(short value);

public AmbientValueAttribute(short value);

new System.ComponentModel.AmbientValueAttribute : int16 -> System.ComponentModel.AmbientValueAttribute

Public Sub New (value As Short)

Parametri

public:
 AmbientValueAttribute(int value);

public AmbientValueAttribute(int value);

new System.ComponentModel.AmbientValueAttribute : int -> System.ComponentModel.AmbientValueAttribute

Public Sub New (value As Integer)

Parametri

public:
 AmbientValueAttribute(long value);

public AmbientValueAttribute(long value);

new System.ComponentModel.AmbientValueAttribute : int64 -> System.ComponentModel.AmbientValueAttribute

Public Sub New (value As Long)

Parametri

public:
 AmbientValueAttribute(System::Object ^ value);

public AmbientValueAttribute(object value);

new System.ComponentModel.AmbientValueAttribute : obj -> System.ComponentModel.AmbientValueAttribute

Public Sub New (value As Object)

Parametri

public:
 AmbientValueAttribute(float value);

public AmbientValueAttribute(float value);

new System.ComponentModel.AmbientValueAttribute : single -> System.ComponentModel.AmbientValueAttribute

Public Sub New (value As Single)

Parametri

public:
 AmbientValueAttribute(System::String ^ value);

public AmbientValueAttribute(string value);

new System.ComponentModel.AmbientValueAttribute : string -> System.ComponentModel.AmbientValueAttribute

Public Sub New (value As String)

Parametri

public:
 AmbientValueAttribute(Type ^ type, System::String ^ value);

public AmbientValueAttribute(Type type, string value);

new System.ComponentModel.AmbientValueAttribute : Type * string -> System.ComponentModel.AmbientValueAttribute

Public Sub New (type As Type, value As String)

Parametri

Esempio

Nell'esempio di codice seguente viene illustrato l'uso AmbientValueAttribute di per applicare il comportamento di ambiente per una proprietà denominata AlertForeColor. Per un elenco di codice completo, vedere Come: Applicare attributi nei controlli Windows Forms.

[AmbientValue(typeof(Color), "Empty")]
[Category("Appearance")]
[DefaultValue(typeof(Color), "White")]
[Description("The color used for painting alert text.")]
public Color AlertForeColor
{
    get =>
        _alertForeColorValue == Color.Empty &&
        Parent != null
            ? Parent.ForeColor
            : _alertForeColorValue;

    set => _alertForeColorValue = value;
}

// This method is used by designers to enable resetting the
// property to its default value.
public void ResetAlertForeColor() =>
    AlertForeColor = s_defaultAlertForeColorValue;

// This method indicates to designers whether the property
// value is different from the ambient value, in which case
// the designer should persist the value.
bool ShouldSerializeAlertForeColor() =>
    _alertForeColorValue != s_ambientColorValue;

<AmbientValue(GetType(Color), "Empty"), _
Category("Appearance"), _
DefaultValue(GetType(Color), "White"), _
Description("The color used for painting alert text.")> _
Public Property AlertForeColor() As Color
    Get
        If Me.alertForeColorValue = Color.Empty AndAlso (Me.Parent IsNot Nothing) Then
            Return Parent.ForeColor
        End If

        Return Me.alertForeColorValue
    End Get

    Set(ByVal value As Color)
        Me.alertForeColorValue = value
    End Set
End Property

' This method is used by designers to enable resetting the
' property to its default value.
Public Sub ResetAlertForeColor()
    Me.AlertForeColor = AttributesDemoControl.defaultAlertForeColorValue
End Sub

' This method indicates to designers whether the property
' value is different from the ambient value, in which case
' the designer should persist the value.
Private Function ShouldSerializeAlertForeColor() As Boolean
    Return Me.alertForeColorValue <> AttributesDemoControl.ambientColorValue
End Function