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The [ProvideProperty()] attribute on ReadWriteAuthorization specified that an ApplyAuthorization property would be dynamically added to all controls extended by ReadWriteAuthorization. Of course, the controls being extended really have no knowledge of this new property or what to do with it. All the behavior associated with the property is contained within the extender control itself. The extender control manages the ApplyAuthorization property by implementing both GetApplyAuthorization() and SetApplyAuthorization() methods. These methods are called by Windows Forms to get and set the property value for each control that has been extended. The Get and Set are automatically prepended by Windows Forms to call these methods. To manage a list of the controls that have been extended, a Dictionary object is used: private Dictionary<Control, bool> _sources = new Dictionary<Control, bool>(); public bool GetApplyAuthorization(Control source) { if (_sources.ContainsKey(source)) return _sources[source]; else return false; } public void SetApplyAuthorization(Control source, bool value) { if (_sources.ContainsKey(source)) _sources[source] = value; else _sources.Add(source, value); } When Windows Forms indicates that the ApplyAuthorization property has been set for a particular extended control, the SetApplyAuthorization() method is called. This method records the value of the ApplyAuthorization property for that particular control, using the control itself as the key value within the Dictionary. Conversely, when Windows Forms needs to know the property value of ApplyAuthorization for a particular control, it calls GetApplyAuthorization(). The value for that control is retrieved from the Dictionary object and returned. If the control can t be found in the Dictionary, then false is returned, since that control is obviously not being extended. The end result here is that the ReadWriteAuthorization control maintains a list of all the controls it extends, along with their ApplyAuthorization property values. In short, it knows about all the controls it will affect, and whether it should be affecting them or not.

F# lists are a common data structure used in functional programming. You saw some examples of concrete lists when using the results of the String.split function in 2. Table 3-8 shows the primitive constructs for building lists.

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At this point, the extender control s basic plumbing is complete. It gets to choose which controls to extend, and maintains a list of all the controls it does extend, along with the ApplyAuthorization property value for each of those controls. When the UI developer wants to enforce authorization rules for the whole form, she can do so by triggering the ReadWriteAuthorization control. To allow this, the control implements a ResetControlAuthorization() method. This method is public, so it can be called by code in the form itself. Typically, this method will be called immediately after a business object has been loaded and bound to the form, or immediately after the user has logged into or out of the application. It is also a good idea to call it after adding a new business object to the database, since some objects will

The empty list Cons an element with a list A list value A range of integers A generated list (see end of chapter) Concatenates two lists

change their authorization rules to be different for an old object than for a new object. You ll see how this works in 9 in the Windows Forms UI for the sample application. The ResetControlAuthorization() method loops through all the items in the list of extended controls. This is the Dictionary object maintained by Get/SetApplyAuthorization as discussed earlier. The ApplyAuthorization value for each control is checked, and if it is true, then authorization rules are applied to that control: public void ResetControlAuthorization() { foreach (KeyValuePair<Control, bool> item in _sources) { if (item.Value) { // apply authorization rules ApplyAuthorizationRules(item.Key); } } } To apply the authorization rules, the code loops through the target control s list of data bindings. Each Binding object represents a connection between a property on the control and a data source, so it is possible to get a reference to the data source through the DataSource property: private void ApplyAuthorizationRules(Control control) { foreach (Binding binding in control.DataBindings) { // get the BindingSource if appropriate if (binding.DataSource is BindingSource) { BindingSource bs = (BindingSource)binding.DataSource; // get the object property name string propertyName = binding.BindingMemberInfo.BindingField; // get the BusinessObject if appropriate if (bs.DataSource is Csla.Core.BusinessBase) { Csla.Core.BusinessBase ds = (Csla.Core.BusinessBase)bs.DataSource; ApplyReadRules( control, binding, propertyName, ds.CanReadProperty(propertyName)); ApplyWriteRules( control, binding, propertyName, ds.CanWriteProperty(propertyName)); } else if (bs.DataSource is Csla.Core.IReadOnlyObject) { Csla.Core.IReadOnlyObject ds = (Csla.Core.IReadOnlyObject)bs.DataSource;

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