AmbientValueAttribute Construtores

public:
 AmbientValueAttribute(bool value);

public AmbientValueAttribute(bool value);

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

Public Sub New (value As Boolean)

Parâmetros

public:
 AmbientValueAttribute(System::Byte value);

public AmbientValueAttribute(byte value);

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

Public Sub New (value As Byte)

Parâmetros

public:
 AmbientValueAttribute(char value);

public AmbientValueAttribute(char value);

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

Public Sub New (value As Char)

Parâmetros

public:
 AmbientValueAttribute(double value);

public AmbientValueAttribute(double value);

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

Public Sub New (value As Double)

Parâmetros

public:
 AmbientValueAttribute(short value);

public AmbientValueAttribute(short value);

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

Public Sub New (value As Short)

Parâmetros

public:
 AmbientValueAttribute(int value);

public AmbientValueAttribute(int value);

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

Public Sub New (value As Integer)

Parâmetros

public:
 AmbientValueAttribute(long value);

public AmbientValueAttribute(long value);

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

Public Sub New (value As Long)

Parâmetros

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

public AmbientValueAttribute(object value);

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

Public Sub New (value As Object)

Parâmetros

public:
 AmbientValueAttribute(float value);

public AmbientValueAttribute(float value);

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

Public Sub New (value As Single)

Parâmetros

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

public AmbientValueAttribute(string value);

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

Public Sub New (value As String)

Parâmetros

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)

Parâmetros

Exemplos

O exemplo de código seguinte demonstra a utilização AmbientValueAttribute para impor comportamento ambiente numa propriedade chamada AlertForeColor. Para uma listagem completa do código, veja Como: Aplicar Atributos em Controlos 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