Attribute Constructor
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Initializes a new instance of the Attribute class.
protected:
Attribute();
protected Attribute ();
Protected Sub New ()
The following code example shows the definition of a custom parameter Attribute class with its constructor.
// Define a custom parameter attribute that takes a single message argument.
[AttributeUsage(AttributeTargets::Parameter)]
public ref class ArgumentUsageAttribute: public Attribute
{
protected:
// usageMsg is storage for the attribute message.
String^ usageMsg;
public:
// This is the attribute constructor.
ArgumentUsageAttribute( String^ UsageMsg )
{
this->usageMsg = UsageMsg;
}
property String^ Message
{
// This is the Message property for the attribute.
String^ get()
{
return usageMsg;
}
void set( String^ value )
{
this->usageMsg = value;
}
}
};
// Define a custom parameter attribute that takes a single message argument.
[AttributeUsage( AttributeTargets.Parameter )]
public class ArgumentUsageAttribute : Attribute
{
// This is the attribute constructor.
public ArgumentUsageAttribute( string UsageMsg )
{
this.usageMsg = UsageMsg;
}
// usageMsg is storage for the attribute message.
protected string usageMsg;
// This is the Message property for the attribute.
public string Message
{
get { return usageMsg; }
set { usageMsg = value; }
}
}
// Define a custom parameter attribute that takes a single message argument.
[<AttributeUsage(AttributeTargets.Parameter); AllowNullLiteral>]
type ArgumentUsageAttribute(usageMsg) =
inherit Attribute()
// This is the Message property for the attribute.
member val Message = usageMsg with get, set
' Define a custom parameter attribute that takes a single message argument.
<AttributeUsage(AttributeTargets.Parameter)> _
Public Class ArgumentUsageAttribute
Inherits Attribute
' This is the attribute constructor.
Public Sub New(UsageMsg As String)
Me.usageMsg = UsageMsg
End Sub
' usageMsg is storage for the attribute message.
Protected usageMsg As String
' This is the Message property for the attribute.
Public Property Message() As String
Get
Return usageMsg
End Get
Set
usageMsg = value
End Set
End Property
End Class
This constructor is only called by classes that derive from Attribute.
製品 | バージョン |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1 |
UWP | 10.0 |
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