C# Class ComponentFactory.Krypton.Workspace.EvaluationMonitor

Provides a mechanism for managing time/usage limited evaluations of products.

Instantiate an instance of this class to read/write the evaluation parameters for the given product. The FirstUseDate is set the first time that the class is instantiated. The LastUseDate is set each time the class is instantiated. The UsageCount is incremented each time the class is instantiated.

Note that evaluation data must be stored somewhere on the users hard disk. It is therefore not too difficult for a sophisticated user to determine the changes made either to registry keys or files (using file/registry monitoring software) and restore the state of these to their pre-installation state (thus resetting the evaluation period). For this reason it is recommended that you don't rely on this mechanism alone. You should also consider limiting the functionality of your product in some way or adding nag screens to discourage long term use of evaluation versions.

If you have a data oriented application you can increase the security of evaluations by storing the current UsageCount somewhere in your database each time the application runs and cross checking this with the number returned by the EvaluationMonitor.

Inheritance: IDisposable

ファイルを表示 Open project: ComponentFactory/Krypton Class Usage Examples

Public Methods

Method	Description
Dispose ( ) : void	Free resources used by the EvaluationMonitor
EvaluationMonitor ( string productID ) : System	Initialize a new instance of the evaluation monitor. The UsageCount is incremented each time a new evaluation monitor is instantiated for a product
Reset ( ) : void	Allows you to reset the evaluation period. This may be useful if a customer needs an extension or if somehow they invalidate their evaluation data by attempting to fiddle

Private Methods

Method	Description
CreateBaseKey ( RegistryKey parent ) : void	Create the base key for this product
Decrypt ( byte data ) : string	Decrypt the given byte data to text
Encrypt ( string text ) : byte[]	Encrypt the given text
Equals ( byte a1, byte a2 ) : bool	Are the contents of the two byte arrays equal
FindBaseKey ( RegistryKey parent ) : RegistryKey	Find the base key for this product
GetDateData ( ) : void	Calculate the number of days the product has been in use
GetUsageData ( ) : void	Get the number of times the product has been used (and increment)

Method Details

Dispose() public method

Free resources used by the EvaluationMonitor

public Dispose ( ) : void
return	void

EvaluationMonitor() public method

Initialize a new instance of the evaluation monitor.

The UsageCount is incremented each time a new evaluation monitor is instantiated for a product

public EvaluationMonitor ( string productID ) : System
productID	string	A string which uniquely identifies the product
return	System

Reset() public method

Allows you to reset the evaluation period.

This may be useful if a customer needs an extension or if somehow they invalidate their evaluation data by attempting to fiddle

public Reset ( ) : void
return	void