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DevForce Resource Center » Development guide » Model » Property interceptors » Interception method signatures
Last modified on October 27, 2011 13:03
While the property interceptor methods described previously allow a great deal of control over the entire interception process, there are times when this is overkill. Sometimes all you really want is to do is modify or inspect the incoming or outgoing values. In these cases, a simplified signature for an interception method is also provided.
Standard interceptor action
Code Listing 14. Employee.UppercaseLastName().
| C# | [IbCore.AfterGet(Employee.EntityPropertyNames.LastName)] public void UppercaseLastName( IbCore.PropertyInterceptorArgs<Employee, String> args) { var lastName = args.Value; if (!String.IsNullOrEmpty(lastName)) { args.Value = args.Value.ToUpper(); } } |
| VB | <IbCore.AfterGet(Employee.EntityPropertyNames.LastName)> Public Sub UppercaseLastName(ByVal args As _ IbCore.PropertyInterceptorArgs(Of Employee, String)) Dim lastName = args.Value If Not String.IsNullOrEmpty(lastName) Then args.Value = args.Value.ToUpper() End If End Sub |
Alternative interceptor action
Code Listing 15. Employee.UppercaseLastNameV2().
| C# | [IbCore.AfterGet(Employee.EntityPropertyNames.LastName)] public String UppercaseLastNameV2(String lastName) { if (!String.IsNullOrEmpty(lastName)) { return lastName.ToUpper(); } else { return String.Empty; } } |
| VB | <IbCore.AfterGet(Employee.EntityPropertyNames.LastName)> Public Function UppercaseLastNameV2(ByVal lastName As String) As String If Not String.IsNullOrEmpty(lastName) Then Return lastName.ToUpper() Else Return String.Empty End If End Function |
In general, any property interceptor action that only inspects or modifies the incoming value without the need for any other context can be written in this form. In fact, if the action does not actually modify the incoming value, the return type of the interceptor action can be declared as void.