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A well-implemented business object should always override three methods from the base System. Object type. Remember that all .NET objects ultimately inherit from System.Object, and so all objects have default implementations of these methods. Unfortunately, the default implementation is not ideal, and better implementations can (and should) be provided by every business object. These three methods are: Equals(), GetHashCode(), and ToString(). To implement each of these methods, the business object must have some unique identifying field a primary key, in a sense. Such a unique identifier can be used to determine equality between objects, to return a unique hash code, and to return a meaningful string representation for the object. Obviously, the BusinessBase class can t automatically determine a unique identifying value for every business object a developer might create. To get such a value, the class instead implements an abstract method that must be implemented by the business developer to return the object s unique key value: protected abstract object GetIdValue();

We ll show how to define the AttemptBuilder type and its members later in the chapter. First we show how you can use the F# syntax for workflows to build Attempt objects. You can build Attempt values that always succeed: > let alwaysOne = attempt { return 1 };; val alwaysOne: Attempt<int> > let alwaysPair = attempt { return (1,"two") };; val alwaysPair: Attempt<int * string> > runAttempt alwaysOne;; val it : int option = Some 1 > runAttempt alwaysPair;; val it : (int * string) option = Some(1,"two") Note that Attempt values such as alwaysOne are just functions, so to run an Attempt value, you just apply it. These correspond to uses of the succeed function, as you ll see shortly.

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This forces any subclass of BusinessBase to implement a GetIdValue() method that returns a unique value identifying the business object This value can then be used to implement the three SystemObject method overrides: public override bool Equals(object obj) { if (obj is T) { object id = GetIdValue(); if (id == null) throw new ArgumentException(ResourcesGetIdValueCantBeNull); return ((T)obj)GetIdValue()Equals(id); } else return false; } public override int GetHashCode() { object id = GetIdValue(); if (id == null) throw new ArgumentException(ResourcesGetIdValueCantBeNull); return idGetHashCode(); } public override string ToString() { object id = GetIdValue(); if (id == null) throw new ArgumentException(ResourcesGetIdValueCantBeNull); return idToString(); } In each case, the result of GetIdValue() is checked to see if it is null If so, an exception is thrown, since these implementations require a non-null value.

You can also build more interesting Attempt values that check a condition and return different Attempt values on each branch, as shown in the next example: > let failIfBig n = attempt { if n > 1000 then return! fail else return n };; val failIfBig: int -> Attempt<int> > runAttempt (failIfBig 999);; val it : int option = Some 999 > runAttempt (failIfBig 1001);; val it : int option = None In the previous example, one branch uses return! to return the result of running another Attempt value, and the other uses return to give a single result These correspond to yield! and yield in sequence expressions Next, you can build Attempt values that sequence together two Attempt values by running one, getting its result, binding it to a variable, and running the second.

The GetHashCode() and ToString() implementations are very simple, as they just use the object s ID value to generate a hash code or a string value, respectively The Equals() method is a bit more interesting It compares the business object to see if it is equal to the object passed as a parameter The first thing it does is check the type of the parameter to see if that object is the same type as the business object: if (obj is T) Notice the use of the generic type, T, to represent the type of the business object If the types are different, then obviously the objects can t be equal to each other If the types are the same, then the obj parameter is casted to type T (the type of the business object), and its ID value is retrieved by calling its GetIdValue() method.

In this example, nodes were created and appended in this order: 1. 2. 3. 4. Create a paragraph element node. Append this paragraph to an element node in the document. Create a text node. Append this text node to the paragraph.

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