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If you run that code, you will get this result: Anthony's Class is: Freshman That solves the boxing problem. However, there is still one other problem. When you attempt to retrieve a column s value using the DataRow object s indexer, remember, the column s value gets returned as an object of type Object. Comparing it to any value or assign it to a variable will require casting it to another data type as we did previously by casting it to an int. Since DataSet objects use DBNull.Value as the value for a column that is null, if that column s value is DBNull.Value, casting it to another data type will throw an exception. Fortunately, LINQ to DataSet has made both of these problems boxed value comparisons and null handling disappear, thanks to the Field<T> and SetField<T> operators. Listing 10-11 shows the previous example using the Field<T> operator.

var ordersQuery = (from r in dataSet.Tables["EmpCustShip"].AsEnumerable() where r.Field<string>("ShipCountry").Equals("Germany") orderby r.Field<string>("EmployeeName"), r.Field<string>("CompanyName") select r) .Distinct(System.Data.DataRowComparer.Default); foreach (var dataRow in ordersQuery) { Console.WriteLine("{0,-20} {1,-20}", dataRow.Field<string>("EmployeeName"), dataRow.Field<string>("CompanyName")); } Now the query is using query expression syntax. While it was my goal to make the query functionally the same as the previous, I was not able to do this. Notice that the Distinct operator is called at the very end of the query now. Remember, the compiler cannot translate all operators from a query specified with query expression syntax, only the most commonly used ones. In this case, it does not know how to translate the Distinct operator. Because of this, I cannot make that call in the query expression syntax portion of the query. As you can see, I did call it at the end of the query. I will end up with the same results from this query. However, there is a performance difference between the query in Listing 11-3 and the query in Listing 11-2. In Listing 11-2, the Distinct operator is called just after the Where operator, so duplicate records are eliminated from the results set prior to ordering them. In Listing 11-3, the Distinct operator is not called until the end, so the duplicate records are still there during the ordering of the results set. This means records are being sorted that will be eliminated once the Distinct operator is called. This is unnecessary work, but unavoidable if you wish to use query expression syntax for this query.

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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" }

Summary

StudentClass[] classDesignations = { new StudentClass { Id = 1, Class = "Sophmore" }, new StudentClass { Id = 7, Class = "Freshman" }, new StudentClass { Id = 13, Class = "Graduate" }, new StudentClass { Id = 72, Class = "Senior" } }; DataTable dt1 = GetDataTable(students); IEnumerable<DataRow> seq1 = dt1.AsEnumerable(); DataTable dt2 = GetDataTable2(classDesignations); IEnumerable<DataRow> seq2 = dt2.AsEnumerable(); string anthonysClass = (from s in seq1 where s.Field<string>("Name") == "Anthony Adams" from c in seq2 where c.Field<int>("Id") == s.Field<int>("Id") select (string)c["Class"]). SingleOrDefault<string>(); Console.WriteLine("Anthony's Class is: {0}", anthonysClass != null anthonysClass : "null");

{ /** * The styleClass attribute. */ public static String STYLE_CLASS_ATTR = "styleClass"; /** * The itemStyleClass attribute. */ public static String ITEM_STYLE_CLASS_ATTR = "itemStyleClass"; /** * The itemHeaderStyleClass attribute. */ public static String ITEM_HEADER_STYLE_CLASS_ATTR = "itemHeaderStyleClass"; /** * The itemContentStyleClass attribute. */ public static String ITEM_CONTENT_STYLE_CLASS_ATTR = "itemContentStyleClass"; public void encodeBegin( FacesContext context, UIComponent component) throws IOException { // first write out resources super.encodeBegin(context, component); ResponseWriter out = context.getResponseWriter(); out.startElement("div", component); Map attrs = component.getAttributes(); String styleClass = (String)attrs.get(STYLE_CLASS_ATTR); if (styleClass != null) out.writeAttribute("class", styleClass, STYLE_CLASS_ATTR); } The encodeBegin() method takes two arguments FacesContext context and UIComponent component. The Render Response phase will call the encodeBegin() method on the UIShowOne component, which in turn will delegate to the encodeBegin() method on the HtmlShowOneDeckRenderer, passing the FacesContext and the UIShowOne component instance. You get the ResponseWriter, write out the first HTML <div> element representing the component, and attach the styleClass defined by the application developer, if any. Before you continue to write anything to the client, you also need to get the component s unique identifier clientId. You do this by calling the getClientId() method on the UIShowOne instance passed as an argument to the Renderer. You then include this unique identifier in the generated markup to ensure that on a postback you will be able to decode the request and apply any values or events to the right component. For more information about the clientId, see 2.

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