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CslaDataSourceView doesn t actually do much work. Rather, it calls methods on CslaDataSource to have it raise the four data access methods. The event handlers in the page then do the real work. For instance, here s the ExecuteInsert() method: protected override int ExecuteInsert( IDictionary values) { // tell the page to insert the object InsertObjectArgs args = new InsertObjectArgs(values); _owner.OnInsertObject(args); return args.RowsAffected; } An instance of InsertObjectArgs is created and initialized with the values list. This is a list of name/value pairs for all the data elements from the web page (provided by ASP.NET), which presumably correspond to properties on the business object. Then the OnInsertObject() method on CslaDataSource is called. That method simply raises the InsertObject method so the web form can handle the event to create a new business object and insert it into the database.
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The ExecuteUpdate() and ExecuteDelete() methods are quite similar, but ExecuteSelect() is a bit more complex: protected override System.Collections.IEnumerable ExecuteSelect(DataSourceSelectArguments arguments) { // get the object from the page SelectObjectArgs args = new SelectObjectArgs(); _owner.OnSelectObject(args); object obj = args.BusinessObject; object result; if (arguments.RetrieveTotalRowCount) { if (obj == null) result = 0; else if (obj is IList) result = ((IList)obj).Count; else if (obj is IEnumerable) { IEnumerable temp = (IEnumerable)obj; int count = 0; foreach (object item in temp) count++; result = count; } else result = 1; } else result = obj; // if the result isn't IEnumerable then // wrap it in a collection if (!(result is IEnumerable)) { ArrayList list = new ArrayList(); list.Add(result); result = list; } // now return the object as a result return (IEnumerable)result; } The first bit of complexity comes because ExecuteSelect() can be called either to retrieve a data source or to retrieve the number of rows in the data source. If it is asked to retrieve the row count, the method still must call OnSelectObject() on CslaDataSource so the UI event handler can return the business object: // get the object from the page SelectObjectArgs args = new SelectObjectArgs(); _owner.OnSelectObject(args); object obj = args.BusinessObject;
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These lines of code are run in every case. If the business object is to be retrieved, then it is returned as a result, but if the row count was requested, then the following code is used to get the number of items in the business object and return that number as a result, rather than the business object itself: if (arguments.RetrieveTotalRowCount) { if (obj == null) result = 0; else if (obj is IList) result = ((IList)obj).Count; else if (obj is IEnumerable) { IEnumerable temp = (IEnumerable)obj; int count = 0; foreach (object item in temp) count++; result = count; } else result = 1; } If the business object reference is null, there are zero rows of data. If the object implements the IList interface, the count is simply retrieved from the object; while if it only implements IEnumerable, the code loops through all items in the list and counts them. Otherwise, the business object is not a collection at all, so obviously the result is 1. Regardless of whether the method is returning the business object or the row count, Web Forms data binding requires that the data source be IEnumerable the most basic interface for a collection or list in .NET. The challenge is that many business objects are simple objects, like Customer or Invoice; and of course, the row count is a simple int value. These values don t implement IEnumerable, and so can t be directly returned as a result. 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(); list.Add(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. That s where the rest of the classes come into play.
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