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guaranteed that the objects are fully deserialized, so the code in the special constructor should not attempt to manipulate the objects that it extracts . If your type must access members (such as call methods) on an extracted object, then it is recommended that your type also provide a method that has the OnDeserialized attribute applied to it or have your type implement the IDeserializationCallback interface s OnDeserialization method (as shown in the Dictionary example) . When this method is called, all objects have had their fields set . However, there is no guarantee to the order in which multiple objects have their OnDeserialized or OnDeserialization method called . So, while the fields may be initialized, you still don t know if a referenced object is completely deserialized if that referenced object also provides an OnDeserialized method or implements the IDeserializationCallback interface .

Start out small with an old PC as your CI server if you need to. Eventually, you ll want better hardware so that you can run builds quickly (remember, the integration build should run in under 5 minutes); but for a build two or three times a day, older hardware will work. If you use the tools we discuss here, your software costs will be minimal.

Shred your garbage Pointer errors are hard to debug because the point at which the memory the pointer points to becomes invalid is not deterministic. Sometimes the memory contents will look valid long after the pointer is freed. Other times, the memory will change right away.

How to Define a Type That Implements ISerializable when the Base Type Doesn t Implement This Interface

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You can force errors related to using deallocated pointers to be more consistent by overwriting memory blocks with junk data right before they re deallocated. As with many other operations, you can do this automatically if you use access routines. In C++, each time you delete a pointer, you could use code like this:

As mentioned earlier, the ISerializable interface is extremely powerful since it allows a type to take complete control over how instances of the type get serialized and deserialized . However, this power comes at a cost: The type is now responsible for serializing all of its base type s fields as well . Serializing the base type s fields is easy if the base type also implements the ISerializable interface; you just call the base type s GetObjectData method . However, someday, you may find yourself defining a type that needs to take control of its serialization but whose base type does not implement the ISerializable interface . In this case, your derived class must manually serialize the base type s fields by grabbing their values and adding them to the SerializationInfo collection . Then, in your special constructor, you will also have to get the values out of the collection and somehow set the base class s

fields . Doing all of this is easy (albeit tedious) if the base class s fields are public or protected, but it can be very difficult or impossible to do if the base class s fields are private . This following code shows how to properly implement ISerializable s GetObjectData method and its implied constructor so that the base type s fields are serialized:

memset( pointer, GARBAGE_DATA, MemoryBlockSize( pointer ) ); delete pointer;

[Serializable] internal class Base { protected String m_name = "Jeff"; public Base() { /* Make the type instantiable */ } } [Serializable] internal class Derived : Base, ISerializable { private DateTime m_date = DateTime.Now; public Derived() { /* Make the type instantiable*/ } // If this constructor didn't exist, we'd get a SerializationException // This constructor should be protected if this class were not sealed [SecurityPermissionAttribute(SecurityAction.Demand, SerializationFormatter = true)] private Derived(SerializationInfo info, StreamingContext context) { // Get the set of serializable members for our class and base classes Type baseType = this.GetType().BaseType; MemberInfo[] mi = FormatterServices.GetSerializableMembers(baseType, context); // Deserialize the base class's fields from the info object for (Int32 i = 0; i < mi.Length; i++) { // Get the field and set it to the deserialized value FieldInfo fi = (FieldInfo)mi[i]; fi.SetValue(this, info.GetValue(baseType.FullName + "+" + fi.Name, fi.FieldType)); } // Deserialize the values that were serialized for this class m_date = info.GetDateTime("Date"); }

We re not taking those responsibilities away from developers. We re moving much of the grunt work to an automated system. This allows programmers to use their brains to solve the business problems of the application. This makes the developers more productive where it counts: writing and debugging code.