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In this example, I use the same basic code I use in the Except example, except I will change the operator calls from Except to Intersect. Listing 10-4 shows that code. Listing 10-4. The Intersect Operator with and Without the Comparer Object 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 we previously mentioned, with the LINQ to XML API, attributes are implemented with the XAttribute class, and unlike the W3C XML DOM API, they do not inherit from a node. Therefore, they have no inheritance relationship with elements. However, in the LINQ to XML API, they are every bit as easy to work with as elements. Let s take a look.

s Note It is important to understand that events can be queued and delivered during any of the following

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Student[] students2 = { new Student { Id = 5, Name = "Abe Henry" }, new Student { Id = 7, Name = "Anthony Adams" }, new Student { Id = 29, Name = "Future Man" }, new Student { Id = 72, Name = "Dignan Stephens" } }; DataTable dt1 = GetDataTable(students); IEnumerable<DataRow> seq1 = dt1.AsEnumerable(); DataTable dt2 = GetDataTable(students2); IEnumerable<DataRow> seq2 = dt2.AsEnumerable(); IEnumerable<DataRow> intersect = seq1.Intersect(seq2, System.Data.DataRowComparer.Default);

Attributes are created just like elements and most other LINQ to XML classes. This topic is covered in the Creating Attributes with XAttribute section previously in this chapter.

Attributes can be traversed using the XElement.FirstAttribute, XElement.LastAttribute, XAttribute.NextAttribute, and XAttribute.PreviousAttribute properties and the XElement.Attribute and XElement.Attributes methods. These are described in the following sections

Console.WriteLine("{0}Results of Intersect() with comparer{0}", System.Environment.NewLine); OutputDataTableHeader(dt1, 15); foreach (DataRow dataRow in intersect) { Console.WriteLine("{0,-15}{1,-15}", dataRow.Field<int>(0), dataRow.Field<string>(1)); } intersect = seq1.Intersect(seq2); Console.WriteLine("{0}Results of Intersect() without comparer{0}", System.Environment.NewLine); OutputDataTableHeader(dt1, 15); foreach (DataRow dataRow in intersect) { Console.WriteLine("{0,-15}{1,-15}", dataRow.Field<int>(0), dataRow.Field<string>(1)); } There is nothing new here. I create a couple of DataTable objects from the two Student arrays and obtain sequences from them. I then call the Intersect operator first with the comparer object and then without. I 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 did not identify any elements from the two sequences as being equal, which is not the desired behavior for this operator.

request lifecycle phases: Apply Request Values, Process Validations, Update Model Values, and Invoke Application.

You can gain access to an element s attributes by accessing its first attribute using the element s FirstAttribute property. Listing 7-75 is an example.

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 second sequence of DataRow objects, yielding any element that has not already been yielded.

// we will use this to store a reference to one of the elements in the XML tree. XElement firstParticipant; XDocument xDocument = new XDocument( new XElement("BookParticipants", firstParticipant = new XElement("BookParticipant", new XAttribute("type", "Author"), new XAttribute("experience", "first-time"), new XAttribute("language", "English"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz"))));

To determine that elements have already been yielded, 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 I am 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.

Console.WriteLine(firstParticipant.FirstAttribute); This code outputs the following: type="Author"

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