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Listing 7-36. Saving a Document with the XDocument.Save Method XDocument xDocument = new XDocument( new XElement("BookParticipants", new XElement("BookParticipant", new XAttribute("type", "Author"), new XAttribute("experience", "first-time"), new XAttribute("language", "English"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")))); xDocument.Save("bookparticipants.xml"); Notice that I called the Save method on an object of type XDocument. This is because the Save methods are instance methods. The Load methods you will read about later in the XML Input section are static methods and must be called on the XDocument or XElement class. Here are the contents of the generated bookparticipants.xml file when viewing them in a text editor such as Notepad: < xml version="1.0" encoding="utf-8" > <BookParticipants> <BookParticipant type="Author" experience="first-time" language="English"> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> </BookParticipants> That XML document output is easy to read because the version of the Save method that I called is formatting the output. That is, if I call the version of the Save method that accepts a string filename and a SaveOptions argument, passing a value of SaveOptions.None would give the same results as the previous. Had I called the Save method like this xDocument.Save("bookparticipants.xml", SaveOptions.DisableFormatting); the results in the file would look like this: < xml version="1.0" encoding="utf-8" ><BookParticipants><BookParticipant type= "Author" experience="first-time" language="English"><FirstName>Joe</FirstName> <LastName>Rattz</LastName></BookParticipant></BookParticipants> This is one single continuous line of text. However, you would have to examine the file in a text editor to see the difference because a browser will format it nicely for you. Of course, you can use any of the other methods available to output your document as well; it s up to you.

int N = 5; IEnumerable<int> intSequence = Enumerable.Range(1, N); // we will just output the sequence so all can see it. foreach (int item in intSequence) Console.WriteLine(item); // Now calculate the factorial and display it. // av == aggregated value, e == element int agg = intSequence.Aggregate((av, e) => av * e); Console.WriteLine("{0}! = {1}", N, agg); In the previous code, we generate a sequence containing the integers from 1 to 5 using the Range operator. After displaying each element in the generated sequence, we call the Aggregate operator passing a lambda expression that multiplies the passed aggregated value with the passed element itself. The following are the results:

s Note Generally, if a UIComponent has the property rendered set to false, then no processing, such as

Saving with XElement.Save()

1 2 3 4 5 5! = 120

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C a utio n You should be careful when using this version of the Aggregate operator that the first element doesn t get operated on twice, since it is passed in as the input value and the element for the first element. In the previous example, our first call to our func lambda expression would have passed in 1 and 1. Since we just multiplied these two values and they are both ones, there is no bad side effect. But if we had added the two values, we would have a sum that included the first element twice.

I have said many times that with the LINQ to XML API, creating an XML document is not necessary. And to save your XML to a file, it still isn t. The XElement class has several Save methods for this purpose:

For the second prototype s example, shown in Listing 5-64, we roll our own version of the Sum operator.

calls to processDecodes() or processValidators(), will occur on the component or on any of its child components.

XElement.Save(string filename); XElement.Save(TextWriter textWriter); XElement.Save(XmlWriter writer); XElement.Save(string filename, SaveOptions options); XElement.Save(TextWriter textWriter, SaveOptions options);

IEnumerable<int> intSequence = Enumerable.Range(1, 10); // I'll just output the sequence so all can see it. foreach (int item in intSequence) Console.WriteLine(item); Console.WriteLine("--"); // Now calculate the sum and display it. int sum = intSequence.Aggregate(0, (s, i) => s + i); Console.WriteLine(sum); Notice that we passed 0 as the seed for this call to the Aggregate operator. And the envelope, please... 1 2 3 4 5 6 7 8 9 10 -55 As you can see, we got the same results that we did when calling the Sum operator in Listing 5-51.

Summary

Listing 7-37 is an example very similar to the previous, except I never even create an XML document. Listing 7-37. Saving an Element with the XElement.Save Method XElement bookParticipants = new XElement("BookParticipants", new XElement("BookParticipant", new XAttribute("type", "Author"), new XAttribute("experience", "first-time"), new XAttribute("language", "English"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz"))); bookParticipants.Save("bookparticipants.xml"); And the saved XML looks identical to the previous example where I actually have an XML document: < xml version="1.0" encoding="utf-8" > <BookParticipants> <BookParticipant type="Author" experience="first-time" language="English"> <FirstName>Joe</FirstName> <LastName>Rattz</LastName> </BookParticipant> </BookParticipants>

During the validation of a UIInput, type conversion will first occur on the component s submitted value. For example, a string is converted to a strongly typed object and then validated. On each UIInput in the UIComponent tree, the processValidators() method will also call the validate() method to type convert and validate the component s submitted value (see Figure 2-8). The validate() method will first call the getSubmittedValue() method on the UIComponent, and if it returns null (when no value was submitted for the UIComponent), it will exit without further processing. If the submitted value is not null, then the validate() method calls the getConvertedValue() method and passes the newly submitted value from the decode process.

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