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When ClientContext is accessed, a lock is used to ensure thread safety. Within that lock, the GetClientContext() method is called to retrieve the context dictionary from its storage location: internal static ContextDictionary GetClientContext() { if (HttpContext.Current == null) { if (ApplicationContext.ExecutionLocation == ExecutionLocations.Client) lock (_syncClientContext) return (ContextDictionary) AppDomain.CurrentDomain.GetData(_clientContextName); else { LocalDataStoreSlot slot = Thread.GetNamedDataSlot(_clientContextName); return (ContextDictionary)Thread.GetData(slot); } } else return (ContextDictionary) HttpContext.Current.Items[_clientContextName]; } This method detects whether the code is running in ASP.NET and retrieves the dictionary from HttpContext or thread-local storage as appropriate. If the dictionary does not yet exist, it is created, then stored using the SetClientContext() method: private static void SetClientContext(ContextDictionary clientContext) { if (HttpContext.Current == null) { if (ApplicationContext.ExecutionLocation == ExecutionLocations.Client) lock (_syncClientContext) AppDomain.CurrentDomain.SetData( _clientContextName, clientContext); else { LocalDataStoreSlot slot = Thread.GetNamedDataSlot(_clientContextName); Thread.SetData(slot, clientContext); } } else HttpContext.Current.Items[_clientContextName] = clientContext; } This method works much the same way, checking to see if the code is running in ASP.NET and storing the value in the correct location.

Timestamp 2009-07-01T16:20:32

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private Roles _roles; private void RolesEdit_Load(object sender, EventArgs e) { try { _roles = Roles.GetRoles(); } catch (Csla.DataPortalException ex) { MessageBox.Show(ex.BusinessException.ToString(), "Data load error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation); } catch (Exception ex) { MessageBox.Show(ex.ToString(), "Data load error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation); } if (_roles != null) this.rolesBindingSource.DataSource = _roles; } Most of this code exists to gracefully handle exceptions. Only two lines really matter: _roles = Roles.GetRoles(); and this.rolesBindingSource.DataSource = _roles; The first retrieves the Roles object, and the second sets the data source using that object. Setting the DataSource property of the BindingSource control automatically connects all the data bound controls on the form to the underlying data source object. The result is that data in the object is displayed in the controls and is available for editing by the user. Of course, the exception-handling code is important too. If an exception occurs during the normal data portal processing, including within the DataPortal_Fetch() method of the Roles object, a Csla.DataPortalException will be thrown. To get at the original exception thrown by the business code, use the BusinessException property. Remember that you can also use the BusinessObject property to get a reference to the business object as it was when the exception was thrown a fact that can be very useful for debugging. It is far less likely that any other exception will be thrown, but I ve included code showing how to catch those exceptions as well. If you look at the client-side DataPortal code from 4, you ll see that very little code executes that can throw exceptions other than a DataPortalException, so other types of exceptions typically only occur during development and debugging.

Notice that both of these methods use internal scope. This is because they are invoked not only from the LocalContext property but also from the data portal. The ClientContext and GlobalContext values flow to and from the client and server through the data portal. 15 provides more details about the data portal. At this point you should have an understanding about how the ApplicationContext class provides access to application context values to the rest of the application.

2009-07-01T16:20:33

This class is a straightforward implementation of a custom attribute, inheriting from System. Attribute: [AttributeUsage(AttributeTargets.Method)] public sealed class TransactionalAttribute : Attribute { private TransactionalTypes _type; public TransactionalAttribute() { _type = TransactionalTypes.EnterpriseServices; } public TransactionalAttribute(TransactionalTypes transactionType) { _type = transactionType; } public TransactionalTypes TransactionType { get { return _type; } } } The [AttributeUsage()] attribute restricts this new attribute so it can only be applied to methods. The parameterless constructor defaults to using TransactionalTypes.EnterpriseServices. This is done for backward compatibility with earlier versions of CSLA .NET, in which the only option was to use Enterprise Services. In most cases, it will be preferable to use the newer TransactionScope option to trigger the use of System.Transactions.

2009-07-01T16:20:33

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