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The AsEnumerable operator has one prototype I will cover. The AsEnumerable Prototype public static IEnumerable<DataRow> AsEnumerable ( this DataTable source ); This operator when called on a DataTable object returns a sequence of DataRow objects. This is typically the first step of performing a LINQ to DataSet query on a DataSet object s DataTable. By calling this operator, you can obtain a sequence, an IEnumerable<T> where T happens to be a DataRow, thereby allowing you to call the many LINQ operators that may be called on an IEnumerable<T> type sequence.

To traverse backward through an element s attributes, reference the PreviousAttribute property on an attribute. Listing 7-77 is an example.

s Note If no Renderer is associated with the UIComponent, it is the responsibility of the component s

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")))); Console.WriteLine(firstParticipant.FirstAttribute.NextAttribute.PreviousAttribute); Notice we chain the FirstAttribute and NextAttribute properties to get a reference to the second attribute from which to go backward. This should take us back to the first attribute. Here are the results: type="Author" And it does! If an attribute s PreviousAttribute property is null, the attribute is the first attribute of the element.

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There is no shortage of examples in this chapter. Since calling the AsEnumerable operator is the first step to perform a LINQ to DataSet query, virtually every example in this chapter is calling the AsEnumerable operator. Therefore, there is no need to provide one here.

To get access to the very last attribute of an element so that you can traverse backward through the attributes, use the LastAttribute property, as shown in Listing 7-78.

Now that you know how to query and modify the DataColumn values of a DataRow, you might just be interested in getting that sequence of modified DataRow objects into a DataTable. The CopyToDataTable operator exists for this very purpose.

// 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")))); Console.WriteLine(firstParticipant.LastAttribute); This should output the language attribute. Let s see:

1 execute()

The CopyToDataTable operator has two prototypes I cover This first prototype is called on an IEnumerable<DataRow> and returns a DataTable This is used to create a new DataTable object from a sequence of DataRow objects The First CopyToDataTable Prototype public static DataTable CopyToDataTable<T> ( this IEnumerable<T> source ) where T : DataRow; The first prototype establishes original versions for each field for you automatically without you needing to call the AcceptChanges method The second prototype is called on an IEnumerable<DataRow> of the source DataTable to update an already existing destination DataTable based on the LoadOption value specified The Second CopyToDataTable Prototype public static void CopyToDataTable<T> ( this IEnumerable<T> source, DataTable table, LoadOption options ) where T : DataRow; The value of the LoadOption argument passed informs the operator whether the original column values only should be changed, the current column values only should be changed, or both.

language="English" Groovy! We have never actually written the word groovy before. We had to let the spelling checker spell it for us.

XElement.Attribute()

This is helpful for managing the DataTable s changes The following are the available values for LoadOption: OverwriteChanges: Both the current value and original value will be updated for each column PreserveChanges: Only the original value will be updated for each column Upsert: Only the current value will be updated for each column This LoadOption argument has now created a bit of a problem, though Notice that the description of each possible value refers to updating the values of a column This, of course, means updating the columns of a record already in the destination DataTable.

render()

This method takes the name of an attribute and returns the first attribute with the specified name, if one is found. Listing 7-79 is an example.

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