LicenseProviderAttribute 类

定义

public ref class LicenseProviderAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Class, AllowMultiple=false, Inherited=false)]
public sealed class LicenseProviderAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Class, AllowMultiple=false, Inherited=false)>]
type LicenseProviderAttribute = class
    inherit Attribute

Public NotInheritable Class LicenseProviderAttribute
Inherits Attribute

继承

Object

Attribute

LicenseProviderAttribute

属性

AttributeUsageAttribute

示例

下面的代码示例使用 LicFileLicenseProvider 作为 的 MyControl许可证提供程序。

[LicenseProvider(LicFileLicenseProvider::typeid)]
ref class MyControl: public Control
{
protected:

   // Insert code here.
   ~MyControl()
   {
      /* All components must dispose of the licenses they grant. 
               * Insert code here to dispose of the license. */
   }
};

[LicenseProvider(typeof(LicFileLicenseProvider))]
public class MyControl : Control
{
    // Insert code here.

    protected override void Dispose(bool disposing)
    {
        /* All components must dispose of the licenses they grant. 
         * Insert code here to dispose of the license. */
    }
}

<LicenseProvider(GetType(LicFileLicenseProvider))> _
Public Class MyControl
    Inherits Control
    
    ' Insert code here.
    Protected Overrides Sub Dispose(ByVal disposing As Boolean)
        ' All components must dispose of the licenses they grant.
        ' Insert code here to dispose of the license.
    End Sub        

End Class

下一个代码示例创建 类的 MyControl 实例。 然后，它获取 类的属性，并输出 所使用的 myNewControl许可证提供程序的名称。

int main()
{
   // Creates a new component.
   MyControl^ myNewControl = gcnew MyControl;

   // Gets the attributes for the component.
   AttributeCollection^ attributes = TypeDescriptor::GetAttributes( myNewControl );

   /* Prints the name of the license provider by retrieving the LicenseProviderAttribute 
        * from the AttributeCollection. */
   LicenseProviderAttribute^ myAttribute = dynamic_cast<LicenseProviderAttribute^>(attributes[ LicenseProviderAttribute::typeid ]);
   Console::WriteLine( "The license provider for this class is: {0}", myAttribute->LicenseProvider );
   return 0;
}

public static int Main()
{
    // Creates a new component.
    MyControl myNewControl = new();

    // Gets the attributes for the component.
    AttributeCollection attributes = TypeDescriptor.GetAttributes(myNewControl);

    /* Prints the name of the license provider by retrieving the LicenseProviderAttribute 
     * from the AttributeCollection. */
    LicenseProviderAttribute myAttribute = (LicenseProviderAttribute)attributes[typeof(LicenseProviderAttribute)];
    Console.WriteLine("The license provider for this class is: " + myAttribute.LicenseProvider.ToString());

    return 0;
}

Public Shared Function Main() As Integer
    ' Creates a new component.
    Dim myNewControl As New MyControl()
    
    ' Gets the attributes for the component.
    Dim attributes As AttributeCollection = TypeDescriptor.GetAttributes(myNewControl)
    
    ' Prints the name of the license provider by retrieving the LicenseProviderAttribute 
    ' from the AttributeCollection. 
    Dim myAttribute As LicenseProviderAttribute = _
        CType(attributes(GetType(LicenseProviderAttribute)), LicenseProviderAttribute)
        
    Console.WriteLine(("The license provider for this class is: " & _
        myAttribute.LicenseProvider.ToString()))
    Return 0
End Function

注解

创建想要许可的组件时，必须通过标记该组件LicenseProviderAttribute来指定 LicenseProvider 。

LicenseProvider使用 属性获取 Type 的 LicenseProvider。

有关属性的详细信息，请参阅属性。 有关许可的详细信息，请参阅 如何：许可组件和控件。

另请参阅

• License
• LicenseContext
• LicenseException
• LicenseManager
• LicenseProvider
• LicFileLicenseProvider
• LicenseUsageMode