}
private set
{
HttpContext.Current.Session[userAuthorisation] = value;
}
}
/// <summary>
/// TeamManagementState is used to store the current state of the
/// TeamManagement.aspx page.
/// </summary>
public static TeamManagementState TeamManagementState
{
get
{
return (TeamManagementState)HttpContext.Current.Session[teamManagementState];
}
set
{
HttpContext.Current.Session[teamManagementState] = value;
}
}
/// <summary>
/// StartDate is the earliest date used to filter records.
/// </summary>
public static DateTime StartDate
{
get
{
if (HttpContext.Current.Session[startDate] == null)
return DateTime.MinValue;
else
return (DateTime)HttpContext.Current.Session[startDate];
}
set
{
HttpContext.Current.Session[startDate] = value;
}
}
/// <summary>
/// EndDate is the latest date used to filter records.
/// </summary>
public static DateTime EndDate
{
get
{
if (HttpContext.Current.Session[endDate] == null)
return DateTime.MaxValue;
else
return (DateTime)HttpContext.Current.Session[endDate];
}
set
{
HttpContext.Current.Session[endDate] = value;
}
}
//---------------------------------------------------------------------
# endregion
}
The class demonstrates the use of property getters that can provide default values if a value has not been explicitly stored. For example, the StartDate property provides DateTime.MinValue as a default.
The property getter for the UserAuthorisation property provides a simple cache of the UserAuthorisation class instance, ensuring that the instance in the session variables is kept up to date. This property also shows the use of a private setter, so that the value in the session variable can only be set under the control of facade class.
The Username property demonstrates a value that may once have been stored as a session variable but is no longer stored this way.
The following code shows how a session variable can be accessed through the facade. Note that there is not need to do any casting in this code.
// Save a session variable
MyApplicationSession.StartDate = DateTime.Today.AddDays(-1);
// Read a session variable
DateTime startDate = MyApplicationSession.StartDate;
Additional Benefits
An additional benefit of the facade design pattern is that it hides the internal implemention from the rest of the application. Perhaps in the future you may decide to use another mechanism of implementing session-state, other than the built-in ASP.NET HttpSessionState class. You only need to change the internals of the facade - you do not need to change anything else in the rest of the application.
Summary
The use of a facade for HttpSessionState provides a much more robust way to access session variables. This is a very simple technique to implement, but with great benefit.
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