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In this chapter, I showed you how to use all the IEnumerable operators for set-type operations with DataRow objects and how to get and set field values using the Field<T> and SetField<T> operators. I also showed you what can go wrong if you do not use the DataRow specific set-type operator prototypes. Combining the LINQ to Objects Standard Query Operators with these DataSet-specific operators allows one to create powerful LINQ queries for DataSet objects. In the next chapter, I wrap up the LINQ to DataSet part of this book by covering how to query typed DataSets with LINQ, as well as provide a real database example of a LINQ to DataSet query.

dataRow.Field<string>(1)); } There is nothing new here. We create a couple of DataTable objects from the two Student arrays and obtain sequences from them. We then call the Intersect operator first with the comparer object and then without. We display the results after each Intersect call. Let s look at the results of that code by pressing Ctrl+F5: Results of Intersect() with comparer Id Name ============================== 7 Anthony Adams 72 Dignan Stephens Results of Intersect() without comparer Id Name ============================== As you can see, the Intersect operator with the comparer is able to properly determine the element equality from the two sequences, whereas the Intersect operator without the comparer is not.

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The Union operator produces a sequence of DataRow objects that is the union of two sequences of DataRow objects. It returns an object that, when enumerated, enumerates the first sequence of DataRow objects, followed by the elements of the second sequence of DataRow that were not contained in the first sequence. To determine that elements have already been returned, 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.

n the previous chapter, I provided numerous examples querying DataTable objects that would naturally come from typical DataSets in a real-world development environment. For the sake of simplicity though, I programmatically created the DataTable objects using a static array declaration. However, there is more to DataSet queries than just creating DataTable objects from statically declared arrays. Also, the examples in the previous chapter were all performed on untyped DataSets. Sometimes, you may find you have a need to query a typed DataSet. LINQ to DataSet can do that too. In this chapter, I address these issues and show you how to make the most of LINQ to DataSet. I begin with a discussion of querying typed DataSets with LINQ to DataSet. Then, since I pointed out that there is more to querying DataSets than programmatically creating DataTable objects, I follow up with a real-world example of querying a database with LINQ to DataSet.

import com.apress.projsf.ch3.event.ShowEvent; import com.apress.projsf.ch3.event.ShowListener;

public static IEnumerable<T> Union<T> ( this IEnumerable<T> first, IEnumerable<T> second, IEqualityComparer<T> comparer);

The examples in this chapter reference classes in the System.Data, System.Data.SqlClient, and System.Linq namespaces. If using directives do not already exist in your code, you should add them like this: using System.Data; using System.Data.SqlClient; using System.Linq;

In this example, we use the same basic code we use in the Intersect example, except we will change the operator calls from Intersect to Union. Listing 10-5 shows that code.

Typed DataSets can be queried using LINQ, just as untyped DataSets can. However, typed DataSets make your LINQ query code simpler and easier to read. When querying a typed DataSet, because there is a class for the DataSet, you may access the table and column names using the typed DataSet object s class properties instead of indexing into the Tables collection or using the Field<T> and SetField<T> operators. So instead of accessing a DataSet object s table named Students like this DataTable Students = dataSet.Tables["Students"]; you can access it like this: DataTable Students = dataSet.Students;

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