Headline

Pull-based XML parsing in C# with XmlReader

Motivation

XML processing with XmlReader which provides a lower-level abstraction over the XML file structure. This implementation retains more complexity than other solutions (e.g. Contribution:csharpLinqToXml) but benefits performance.

Illustration

For totaling salaries we read XML file and check for "Salary" nodes. For cutting, we go through the source XML file in a streaming fashion (by using Read() method of XmlReader which reads a current line of an input XML stream and goes to the next one) and write the content as-is into an output string. We maintain a valid XML structure, even temporary it is represented as a string type.

Every time we reach the "Salary" node, we read the content (which is the actual salary) as a decimal number, cut it, and write into an output string.

When the end of the source file is reached, we use XmlTextWriter to produce a new XML file from the raw XML content in a string variable.

Architecture

Features.cs contains static methods where Feature:Cut and Feature:Total are implemented. FeaturesTest.cs contains the relates unit tests.

Usage

Technology:Visual Studio 2010 should be used to open a project file. The project itself is a class-library and compiles into a DLL. To run a project you must execute at least one unit test (or all at once). Nunit GUI or other Visual studio extension (e.g. Resharper) should be used for executing unit tests.


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