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Console.WriteLine("{0}Results of Except() with comparer{0}", System.Environment.NewLine); OutputDataTableHeader(dt1, 15); foreach (DataRow dataRow in except) { Console.WriteLine("{0,-15}{1,-15}", dataRow.Field<int>(0), dataRow.Field<string>(1)); } except = seq1.Except(seq2); Console.WriteLine("{0}Results of Except() without comparer{0}", System.Environment.NewLine); OutputDataTableHeader(dt1, 15); foreach (DataRow dataRow in except) { Console.WriteLine("{0,-15}{1,-15}", dataRow.Field<int>(0), dataRow.Field<string>(1)); } We create two DataTable objects that are populated from the Student arrays. We create sequences from each DataTable object by calling the AsEnumerable method. We then call the Except operator on the two sequences and display the results of each. As you can see, the first time we call the Except operator, we pass the System.Data.DataRowComparer.Default comparer object. The second time we do not. Let s look at the results of that code by pressing Ctrl+F5: Results of Except() with comparer Id Name ============================== 1 Joe Rattz 13 Stacy Sinclair Results of Except() without comparer Id Name ============================== 1 Joe Rattz

Even the record I actually updated is in the DataTable twice now You may be wondering, since I made such a big deal about calling the HasVersion method since the AcceptChanges method was not called, why not just call the AcceptChanges method You could do that, but if you did, all of the fields current version values would have become their original version values, and you would not have been able to tell which records had changed For these examples, I want the original version values and current version values to be distinguishable when a record is changed The solution to the problem in the previous example is to specify the primary keys for the destination DataTable Listing 10-19 is the same example as the previous, except this time I specify the primary keys..

7 13 72

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Listing 10-19. Calling the Second Prototype of the CopyToDataTable Operator When Primary Keys Are Established Student[] students new Student { Id new Student { Id new Student { Id new Student { Id }; = = = = = { 1, Name = "Joe Rattz" }, 7, Name = "Anthony Adams" }, 13, Name = "Stacy Sinclair" }, 72, Name = "Dignan Stephens" }

As you can see, the Except operator called with the System.Data.DataRowComparer.Default comparer object is able to properly determine the element equality for the two sequences, whereas the Except operator without the comparer object does not.

In case a component writer would like to create a component that uses ShowEvent and ShowListener (for example, maybe for a UIShowMany component), you should follow best practices by isolating the event listener management methods into an interface. The naming convention for this interface is based on the event and listener names, with a Source suffix. In this case, the listener management interface is called ShowSource, as shown in Code Sample 3-11. Code Sample 3-11. The ShowSource Interface import com.apress.projsf.ch3.event.ShowListener; import javax.faces.el.MethodBinding; /** * A ShowSource is the source of ShowEvents. */ public interface ShowSource { /** * Adds a ShowListener to this ShowSource component. * * @param listener the show listener to be added */ public void addShowListener( ShowListener listener); /** * Removes a ShowListener to this ShowSource component. * * @param listener the show listener to be removed */

The Intersect operator produces a sequence of DataRow objects that is the intersection of two sequences of DataRow objects. It returns an object that when enumerated enumerates the second sequence of DataRow objects collecting the unique elements, followed by enumerating the first sequence of DataRow objects, returning those elements occurring in both sequences as they are generated. To determine that elements from the same sequence are unique and that one element in one sequence is or is not equal to an element in the other sequence, the operator must be able to determine whether two elements are equal. Typically, this operator determines element equality by calling each element s data type s GetHashCode and Equals methods. However, for DataRow type objects, this would cause an incorrect result. Because we are going to call the additional prototype and provide the System.Data.DataRowComparer.Default comparer object, the element equality will be properly determined. With it, a row is deemed to be a duplicate by comparing DataRow objects using the number of columns in a row and the static data type of each column and then using the IComparable interface on each column if its dynamic data type implements the IComparable interface, or calling the static Equals method in System.Object if it does not.

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