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object s data has changed. The IsSavable property is a simple helper to combine those two properties into one: [Browsable(false)] public virtual bool IsSavable { get { return (IsDirty && IsValid); } } The primary purpose for this property is to allow a Windows Forms UI developer to bind the Enabled property of a Save button such that the button is only enabled if the object can be saved.

I could run a further check, using the nodeName property, to verify this: if (placeholdernodeName != "IMG") return false; Notice that in HTML documents, nodeName always a returns an uppercase value, even if the element is lowercase in the markup There are further checks I could introduce I m assuming that the firstChild of the description element is a text node, but I should really check to make sure I can use the nodeType property for this test If you recall, text nodes have a nodeType value of 3: if (descriptionfirstChildnodeType == 3) { descriptionfirstChildnodeValue = text; } This is how the showPic function would look with these extra tests: function showPic(whichpic) { if (!documentgetElementById("placeholder")) return false; var source = whichpicgetAttribute("href"); var placeholder = documentgetElementById("placeholder"); if (placeholdernodeName != "IMG") return false; placeholdersetAttribute("src",source); if (documentgetElementById("description")) { var text = whichpic.

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Note Because events allow you to register callbacks, it is sometimes important to be careful about the thread on which an event is being raised. This is particularly the case when programming with multiple threads or the .NET thread pool. Events are usually fired on the GUI thread of an application. See 13 for more details about concurrent and multithreaded programming.

The CSLA NET framework provides for deferred or immediate deletion of an object The immediate approach directly deletes an object s data from the database without first loading the object into memory It requires prior knowledge of the object s primary key value(s), and is discussed in 4, as it is directly linked to data access The deferred approach requires that the object be loaded into memory The user can then view and manipulate the object s data, and may decide to delete the object, in which case the object is marked for deletion The object is not immediately deleted, but rather it is deleted if and when the object is saved to the database At that time, instead of inserting or updating the object s data, it is deleted from the database This approach is particularly useful for child objects in a collection.

Summary

In such a case, the user may be adding and updating some child objects at the same time as deleting others All the insert, update, and delete operations occur in a batch when the collection is saved to the database Whether an object is marked for deletion or not is tracked by the _isDeleted field and exposed through an IsDeleted property As with IsDirty, there s a protected method to allow the object to be marked for deletion when necessary: protected void MarkDeleted() { _isDeleted = true; MarkDirty(); } Of course, marking the object as deleted is another way of changing its data, so the MarkDirty() method is called to indicate that the object s state has been changed The MarkDeleted() method is called from the Delete() and DeleteChild() methods.

In this chapter, we covered some of the techniques that you are likely to use in your day-to-day F# programming, including an in-depth look at hashing, equality, and comparison, resource management, tail calls, caching, memoization, and the basics of how F# reveals the wiring for first-class events. In the next chapter, we introduce a final set of language constructs and techniques related to language-oriented programming tasks.

getAttribute("title") whichpicgetAttribute("title") : ""; var description = documentgetElementById("description"); if (descriptionfirstChildnodeType == 3) { descriptionfirstChildnodeValue = text; } } return true; } The function is much more verbose when it s done in this way In a real-world situation, you may decide that all these checks aren t necessary They are intended to account for situations where the markup might be beyond your control Ideally, your scripts shouldn t assume too much about the content and structure of the markup That said, these kinds of decisions need to be made on a case-by-case basis..

The Delete() method is used to mark a non-child object for deferred deletion, while DeleteChild() is called by a parent object (like a collection) to mark the child object for deferred deletion: public void Delete() { if (thisIsChild) throw new NotSupportedException(ResourcesChildDeleteException); MarkDeleted(); } internal void DeleteChild() { if (!thisIsChild) throw new NotSupportedException(ResourcesNoDeleteRootException); MarkDeleted(); }.

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