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A considerable number of .NET Remoting issues are caused by incorrect configuration settings. Because most of these settings are case sensitive, a minor typo will yield unexpected results. Configuration mistakes like these happen, for example, if you ve chosen a deployment scenario in which you copy the complete server assembly to your client application and create your remoting proxies using a combination of RemotingConfiguration.Configure() and the new operator.1 Let s assume that you ve created a class called CustomerManager in the namespace ServerImpl, and compiled it to a library called ServerImpl.DLL. In this case, the server-side configuration file may look similar to this one:

Summary

Figure 4-1 presents the most important architectural features of ADO.NET. We ll discuss them in far greater detail in later chapters.

You have some choices when code analysis shows you have broken a rule. The obvious thing to do is to change the code. There really is no good reason why the methods in the Calculator class shouldn t be static, so I can go ahead and make the change shown by Listing 38-8. Listing 38-8. Changing Code to Fix a Rule Violation class Calculator {

100 100 200 300 300 300 300 Ouch Good Ouch, but consistent Ouch, but consistent Ouch, but consistent Ouch, ouch Ouch, ouch, but consistent

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The init() method is passed an object implementing the PortletConfig interface. This object will be unique to the portlet definition and provides access to the initialization parameters and the ResourceBundle configured for the portlet in the portlet definition. The init() method on a portlet instance is called only once by a portlet container. Until the init() method has been invoked successfully, the portlet will not be considered active, so static initialization of the class should not trigger any methods that make this assumption. For example, the static (class rather than object scope) initializers of your class should not invoke connections to a database. In our example, the init() method increases the number of portlet instances noted in the portletCounter attribute:

<s:WebService id="AmazonService" wsdl="http://webservices.amazon.com/AWSECommerceService/ AWSECommerceService.wsdl" showBusyCursor="true" fault="Alert.show(event.fault.faultString)">

Collection objects must implement a GetEnumerator() method. This is required by the IEnumerable interface, which is the most basic interface for collection or list objects in the .NET Framework. In the case of SortedBindingList, both strongly typed and loosely typed GetEnumerator() methods must be implemented: public IEnumerator<T> GetEnumerator() { if (_sorted) return new SortedEnumerator(_list, _sortIndex, _sortOrder); else return _list.GetEnumerator(); } IEnumerator System.Collections.IEnumerable.GetEnumerator() { return GetEnumerator(); } These methods merely return an instance of an enumerator object for use by foreach statements that wish to iterate through the items in the collection. If the view is not currently sorted, then it can simply ask the original collection for its enumerator. The original collection s enumerator will already iterate through all the child objects in the collection in their original order: return _list.GetEnumerator(); On the other hand, if a sort has been applied, then an instance of the custom SortedEnumerator (implemented in the preceding code) is returned: return new SortedEnumerator(_list, _sortIndex, _sortOrder); Either way, the compiler generated code for the foreach statement has an enumerator object that iterates through the items in the collection.

Unconstrained type parameters can be either reference types or value types, and the same constructs will just work appropriately for either When an assignment occurs in the generic type, if it s a value type, the value is copied, but if it s a reference type, the reference, not the value, is copied In some cases, however, you will want to write an algorithm that assumes the semantics of one or the other Perhaps your algorithm copies and then destroys or destructively modifies objects so it either wouldn t work or would corrupt any reference types that are used It is possible to constrain a type parameter such that it may only be a value type, or only a reference type, if needed The syntax is show in Listing 11-14 Listing 11-14 Using Value Type Constraints // valuetype_constraint.

One important point is that portlets may not be included in the output of another portlet using dispatchers. Rendering one portlet s content inside another portlet should be accomplished by calling methods directly to get content, providing access to the portlet s templates, or another form of direct access.

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