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The ExecuteSelect() method overcomes this issue by checking to see if the result to be returned implements IEnumerable; if not, it wraps the result in an ArrayList collection: // if the result isn't IEnumerable then // wrap it in a collection if (!(result is IEnumerable)) { ArrayList list = new ArrayList(); listAdd(result); result = list; } // now return the object as a result return (IEnumerable)result; In most cases, the end result is that the business object created by the UI event handler is returned as a result (possibly wrapped in an ArrayList object) In other cases, the row count is returned instead, as requested by ASP NET The CslaDataSource and CslaDataSourceView classes are the only ones required to support runtime operations But they don t provide designer support within Visual Studio, and that is an integral part of the web development experience.

Caution If you use locks inside data structures, then do so only in a simple way that uses them to enforce

That s where the rest of the classes come into play..

just the concurrency properties you have documented. Don t lock just for the sake of it, and don t hold locks longer than necessary. In particular, beware of making indirect calls to externally supplied function values, interfaces, or abstract members while a lock is held. The code providing the implementation may not be expecting to be called when a lock is held and may attempt to acquire further locks in an inconsistent fashion.

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The CslaDataSourceDesigner class is the counterpart to CslaDataSource. Like CslaDataSource, CslaDataSourceDesigner is little more than a switchboard, routing calls to the CslaDesignerData SourceView object where the real work occurs. In its role as go-between, CslaDataSourceDesigner maintains references to the CslaDataSource control itself, and to the CslaDesignerDataSourceView object: public class CslaDataSourceDesigner : DataSourceDesigner { private CslaDataSource _control = null; private CslaDesignerDataSourceView _view = null; } CslaDataSourceDesigner is also responsible for telling the Web Forms page designer what capabilities are supported by the control. For instance, the CanRefreshSchema property is used by Visual Studio to determine whether the refresh schema option is available for the data source control like in Figure 5-8. CslaDataSource does support this capability, so the property returns true: public override bool CanRefreshSchema { get { return true; } }

The presentation layer, achieved with Cascading Style Sheets, describes how the content should be displayed. You can use CSS to declare, Paragraphs should be colored grey and use Arial or some other sans-serif font : p { color: grey; font-family: "Arial", sans-serif; }

As with CslaDataSource and CslaDataSourceView, however, the real work of providing design time support is handled by the view class: CslaDesignerDataSourceView.

It is common that mutable data structures get read more than they are written. Indeed, mutation is often used only to initialize a mutable data structure. In this case, you can use a .NET ReaderWriterLock to protect access to a resource. The following two functions are provided in the F# library module Microsoft.FSharp.Control.SharedMemory.Helpers: open System.Threading let readLock (rwlock : ReaderWriterLock) f = rwlock.AcquireReaderLock(Timeout.Infinite) try f() finally rwlock.ReleaseReaderLock() let writeLock (rwlock : ReaderWriterLock) f = rwlock.AcquireWriterLock(Timeout.Infinite) try f(); Thread.MemoryBarrier() finally rwlock.ReleaseWriterLock() Listing 13-15 shows how to use these functions to protect the MutablePair class. Listing 13-15. Shared-Memory Code with a Race Condition type MutablePair<'a,'b>(x:'a,y:'b) = let mutable currentX = x let mutable currentY = y let rwlock = new ReaderWriterLock() member p.Value = readLock rwlock (fun () -> (currentX,currentY)) member p.Update(x,y) = writeLock rwlock (fun () -> currentX <- x; currentY <- y)

The CslaDesignerDataSourceView object is really in control of what capabilities Visual Studio offers to the developer for a given data source. This object is responsible for providing the information listed in Table 5-8. Table 5-8. Information Provided by CslaDesignerDataSourceView

Table 13-7 shows some of the other shared-memory concurrency primitives available in the .NET Framework.

Finally, the behavior layer describes how the content should react to events. This is where JavaScript and the DOM rule the roost. Using the DOM, you can specify, When the user clicks on a paragraph, display an alert dialog :

Schema information describing the properties of the data source (business object) Sample data for display in controls during design time; must match the object schema Flags indicating whether the data source supports various capabilities (such as insert, update, and delete) Flags indicating whether the control supports various capabilities (such as retrieving the row count)

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