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Understanding the LINQ to XML API
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Included with the programs that accompany this book is a sample called It shows you how to write a single declarative statement that generates a document listing all the planets and all the moons in our solar system That sample includes the following constructor for the planet Jupiter, the body of which is nested inside a much larger declaration for all the planets and their moons:
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The fth overload of the constructor accepts this code with nary a blink Designing and implementing code like this clearly requires an advanced degree in compiler magic Nevertheless, the code itself is easy to use This is declarative code at its best, allowing us to write a constructor that closely mirrors the shape of the complex XML documents that many developers frequently create
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13: LINQ to XML: Creation
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Creating a Document from Raw Text Here is an alternative means of creating an XML document:
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As you can see, the method of the class allows you to pass in raw XML directly as a string literal Sometimes this is the fastest and easiest way to create an XML document in your code
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Building a Document One Node at a Time Although it is usually simplest to create an XML document with a single statement in the declarative style, it is possible to take other approaches Listing 134 shows how to build a document one node at a time with a series statements See the program that accompanies this book called of
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Listing 134 Creating an XML Document One Node at a Time Using Statements
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Understanding the LINQ to XML API
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The method shown here is found in both the and classes I recommend using this technique primarily when you need to edit an existing document An XML document is a single, heavily nested hierarchy of nodes, but the code shown in Listing 134 gives the impression that the document consists of separable, discreet pieces As a result, many developers prefer to use the declarative style shown in Listing 132 Note also that the code shown in Listing 134 gives you no sense of the shape of the document you are creating The failure of this imperative code to give you a sense of the shape of the document highlights one of the virtues of declarative code
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Declarative Versus Imperative Revisited
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It is my belief that declarative code is better than imperative code when it is used at the right time and place Both methods of programming have advantages, and it is important to learn how to get the best from both styles It just happens that the declarative style lends itself well to the act of creating XML documents, just as it suits the act of querying data This doesn t mean that it is the best tool to use in all cases, however
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Reading and Writing XML Listing 135 shows how to create an XML document and then save it to disk
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Listing 135 Saving a File to Disk
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Figure 135 shows the document created by Listing 134 It appears as it would if you typed it from the command prompt Note the small set of
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13: LINQ to XML: Creation
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unreadable characters at the start of the second line This is the UTF-8 header The header becomes visible at the command prompt, but it usually is not shown in most editors
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The UTF-8 document created by the code shown in Listing 134
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This is not a reference book, so I won t discuss each part in depth, but and method: here are the overloads for the
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saves declarations and similar information that appear does not The enumeration before the root node, but allows you to decide how to treat white space and provide a method: Both
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does not load information such as a declaration that appears reads in that kind of information before the root node As mentioned, if you load the document this way and then try to write method for it to the console, you will discover that the default
Understanding the LINQ to XML API
the class does not write out the XML declaration If you want to see the entire XML document, you need to write two lines of code:
Alternatively, you can use the can see how it appears on disk: