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As covered in this chapter, not only can you query normal DataSets with LINQ to DataSet, you can query typed DataSets Typed DataSets make your code easier to maintain and more readable, and LINQ to DataSet makes querying those typed DataSets a breeze I also demonstrated a more realworld LINQ to DataSet query that queried the Northwind database The LINQ to DataSet API adds yet another domain to those available for LINQ queries With all the existing code already utilizing DataSets, LINQ to DataSet promises to be easy to retrofit into your legacy NET code, thereby making it easier than ever to query data from a DataSet One benefit that the LINQ to DataSet API has over the LINQ to SQL API is the fact that no database class code needs to be generated and compiled ahead of time to perform LINQ to DataSet queries.

This code is the same as the previous example except we call the Field<T> operator instead of casting the field as an int. Here are the results: Anthony's Class is: Freshman

As we demonstrated in Listing 10-11, the Field<T> operator allows you to obtain the value of a column from a DataRow object and handles the casting of DBNull.Value and boxed value comparison problems we previously discussed.

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This makes LINQ to DataSet more dynamic and suitable for database-type utilities where the databases will be unknown until runtime By providing the AsEnumerable operator to create sequences from DataTable objects, using the LINQ to Objects Standard Query Operators becomes possible, adding even more power to the arsenal of query capabilities For the LINQ to DataSet API, operators have been added for the key classes of the DataSet: DataTable, DataRow, and DataColumn One must not forget the issue that makes the new set-type operator prototypes for the Distinct, Union, Intersect, Except, and SequenceEqual operators necessary: the problem that DataRows have being compared for equality So when working with DataSets, DataTables, and DataRows, always opt for the LINQ to DataSet set-type operator prototypes for the Distinct, Union, Intersect, Except, and SequenceEqual operators where the equality comparer object is specified instead of the prototype versions without an equality comparer object being specified.

According to the requirements, the UIShowOne component is controlling which item UIShowItem to expand. This is managed by a JavaScript resource written to the response by the encodeResources() method, as shown in Code Sample 3-19. Code Sample 3-19. The encodeResources() Method /** * Write out the HtmlShowOneDeck resources. * * @param context the Faces context * @param component the Faces component */ protected void encodeResources( FacesContext context, UIComponent component) throws IOException { writeScriptResource(context, "/projsf-ch3/showOneDeck.js"); writeStyleResource(context, "/projsf-ch3/showOneDeck.css"); } The writeScriptResource() method provided by the HtmlRenderer superclass guarantees that a script resource is written only once during rendering, even if multiple ProShowOneDeck components appear on the same page. In Code Sample 3-19, the encodeResources() method writes out a JavaScript resource needed to render the ProShowOneDeck component showOneDeck.js. You also encode a CSS style sheet resource showOneDeck.css to define the ProShowItem, ProShowItemHeader, and ProShowItemContent CSS style classes that are shared by all ProShowOneDeck components on the same page.

The Field operator has six prototypes we cover. The first prototype returns the column s value for the DataColumn and version specified.

Lastly, when obtaining a column s value, use the Field<T> and SetField<T> operators to eliminate issues with comparisons for equality and null values One thing became apparent while working with the LINQ to DataSet API I had totally underestimated the power and utility of DataSets They offer so much in the way of a cached, relational data store And while they already offer somewhat limited search facilities, with the LINQ to DataSet API, those limitations have been removed You now have LINQ to query your DataSets with, and that makes coding just that much easier..

public static T Field ( this DataRow first, System.Data.DataColumn column, System.Data.DataRowVersion version); The second prototype returns the column s value for the column with the name and version specified.

public static T Field ( this DataRow first, string columnName, System.Data.DataRowVersion version); The third prototype returns the column s value for the column with the ordinal and version specified.

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