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if (propertyInfo != null) { bool couldWrite = (!(bool)propertyInfo.GetValue( ctl, new object[] { })); propertyInfo.SetValue( ctl, !canWrite, new object[] { }); if ((!couldWrite) && (canWrite)) binding.ReadValue(); } If a ReadOnly property is found, then it is set to true or false depending on whether the user is allowed or denied write access to the business object property: propertyInfo.SetValue( ctl, !canWrite, new object[] { }); First, though, the value of the control s ReadOnly property is retrieved. If it is false, that means that the user was already able to edit the control the user could write, so couldWrite is true. This is important, because if the user was unable to edit the control, and now is able to edit the control, data binding needs to be told to reload the data from the data source into the control: if ((!couldWrite) && (canWrite)) binding.ReadValue(); Otherwise, it is possible for the user to be placed into an empty control even though there really is a value in the business object s property. If the control doesn t have a ReadOnly property, then the Enabled property is used as a fallback. The same procedure is used, just with the Enabled property instead: bool couldWrite = ctl.Enabled; ctl.Enabled = canWrite; if ((!couldWrite) && (canWrite)) binding.ReadValue(); The end result is that when the user is denied write access to a business object s property, controls bound to that property are either set to ReadOnly or are disabled. And if the user is denied read access to a business object s property, controls bound to that property are disabled and empty values are placed in the control rather than any real values from the business object.

Here is an example of using pattern matching with lists: let printFirst primes = match primes with | h :: t -> printfn "The first prime in the list is %d" h | [] -> printfn "No primes found in the list" > printFirst oddPrimes;; The first prime in the list is 3 val it : unit = ().

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The BindingSourceRefresh control is also an extender control, but its purpose is quite different from the ReadWriteAuthorization control. It turns out that there s a quirk (either a bug or an odd implementation choice) in the way Windows Forms data binding works. The BindingSourceRefresh control helps work around this quirk. The quirk is that when data is changed in a business object, data binding doesn t always display the changes in the controls on the form. This occurs in the following sequence of events: 1. The user edits a value in a bound control. 2. Data binding puts the user s new value into the business object. 3. The business object alters the value in the property set block. 4. The business object raises its PropertyChanged event. You would expect that data binding would handle the PropertyChanged event, realize that the property s data has changed, and then update the control with the new value. And that does happen

The two functions that we ve written, displayAbbreviations and displayCitations, have a lot in common. They both begin by creating a node set of a certain element (abbr or blockquote). Then they loop through this node set, creating some markup during each iteration of the loop. This markup is then inserted into the document. Let s look at one more example that follows this pattern. We ll write a function to display all the access keys used in a document. The accesskey attribute associates an element, such as a link, with a specific key on a keyboard. This can be useful for people who don t navigate with a mouse. If you are visually impaired, for instance, it s very handy to have keyboard shortcuts. On many Windows browsers, you can press Alt+access key; on many Mac browsers, you can press Ctrl+access key. Here s an example of an accesskey attribute: <a href="index.html" accesskey="1">Home</a>

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