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LicFileLicenseProvider Class

Provides an implementation of a LicenseProvider. The provider works in a similar fashion to the Microsoft .NET Framework standard licensing model.

System.Object
  System.ComponentModel.LicenseProvider
    System.ComponentModel.LicFileLicenseProvider

Namespace:  System.ComponentModel
Assembly:  System (in System.dll)
'Declaration
<HostProtectionAttribute(SecurityAction.LinkDemand, SharedState := True)> _
Public Class LicFileLicenseProvider _
	Inherits LicenseProvider

The LicFileLicenseProvider type exposes the following members.

  NameDescription
Public methodLicFileLicenseProviderInitializes a new instance of the LicFileLicenseProvider class.
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  NameDescription
Public methodEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeServes as the default hash function. (Inherited from Object.)
Protected methodGetKeyReturns a key for the specified type.
Public methodGetLicenseReturns a license for the instance of the component, if one is available. (Overrides LicenseProvider.GetLicense(LicenseContext, Type, Object, Boolean).)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodIsKeyValidDetermines whether the key that the GetLicense method retrieves is valid for the specified type.
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
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The LicFileLicenseProvider offers GetLicense and IsKeyValid methods. The IsKeyValid method determines whether the LicenseKey retrieved by the GetLicense method is valid. When you inherit from this class, you can override the IsKeyValid method to provide your own validation logic.

This class exists to provide similar licensing functionality to COM licensing and uses text license files.

For more information on licensing, see How to: License Components and Controls.

NoteNote

The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: SharedState. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes.

The following example creates a licensed control using the Validate method. It uses LicFileLicenseProvider for the license manager.

Imports System
Imports System.ComponentModel
Imports System.Windows.Forms

' Adds the LicenseProviderAttribute to the control.
<LicenseProvider(GetType(LicFileLicenseProvider))> _
Public Class MyControl
    Inherits Control

    ' Creates a new, null license. 
    Private license As License = Nothing     

    Public Sub New()        

        ' Adds Validate to the control's constructor.
        license = LicenseManager.Validate(GetType(MyControl), Me)

        ' Insert code to perform other instance creation tasks here. 

    End Sub 

    Protected Overrides Sub Dispose(ByVal disposing As Boolean)

        If disposing Then 
            If (license IsNot Nothing) Then
                license.Dispose()
                license = Nothing 
            End If 
        End If 

    End Sub     

End Class

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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