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POMerge and override .NET configuration files with C#
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  1. POMerge and override .NET configuration files with C#
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    copied!<p>I wrote this piece of code to merge two .NET configuration files: Add non existent nodes and override values on existing ones. I avoided to use the much faster reader/writer way because the app I'm using it for is not performance critical. What do you think of this?</p> <pre><code>using System; using System.Xml; namespace devcoach.FrameworkExtensions { /// &lt;summary&gt; /// Extension methods for the type /// &lt;see cref="System.Xml.XmlDocument"/&gt;. /// &lt;/summary&gt; public static class XmlDocumentExtensions { /// &lt;summary&gt; /// Merges the specified instance. /// &lt;/summary&gt; /// &lt;param name="instance"&gt;The instance.&lt;/param&gt; /// &lt;param name="mergeDoc"&gt;The merge doc.&lt;/param&gt; public static void Merge( this XmlDocument instance, XmlDocument mergeDoc) { var mergeRoot = mergeDoc.DocumentElement; var sourceRoot = instance.DocumentElement; if (sourceRoot == null) return; instance.Merge(sourceRoot, mergeRoot, false); } /// &lt;summary&gt; /// Merges the specified instance. /// &lt;/summary&gt; /// &lt;param name="instance"&gt;The instance.&lt;/param&gt; /// &lt;param name="mergeDoc"&gt;The merge doc.&lt;/param&gt; /// &lt;param name="isNetConfigFile"&gt;if set to &lt;c&gt;true&lt;/c&gt; if documents /// are .net config files.&lt;/param&gt; public static void Merge( this XmlDocument instance, XmlDocument mergeDoc, bool isNetConfigFile) { var mergeRoot = mergeDoc.DocumentElement; var sourceRoot = instance.DocumentElement; if (sourceRoot == null) return; instance.Merge(sourceRoot, mergeRoot, true); } /// &lt;summary&gt; /// Merges the specified source doc. /// &lt;/summary&gt; /// &lt;param name="sourceDoc"&gt;The source doc.&lt;/param&gt; /// &lt;param name="sourceRoot"&gt;The source root.&lt;/param&gt; /// &lt;param name="mergeRoot"&gt;The merge root.&lt;/param&gt; public static void Merge( this XmlDocument sourceDoc, XmlNode sourceRoot, XmlNode mergeRoot) { sourceDoc.Merge( sourceRoot, mergeRoot, false); } /// &lt;summary&gt; /// Merges the specified source doc. /// &lt;/summary&gt; /// &lt;param name="sourceDoc"&gt;The source doc.&lt;/param&gt; /// &lt;param name="sourceRoot"&gt;The source root.&lt;/param&gt; /// &lt;param name="mergeRoot"&gt;The merge root.&lt;/param&gt; /// &lt;param name="isNetConfigFile"&gt;if set to &lt;c&gt;true&lt;/c&gt; if documents /// are .net config files.&lt;/param&gt; public static void Merge( this XmlDocument sourceDoc, XmlNode sourceRoot, XmlNode mergeRoot, bool isNetConfigFile) { #region Check parameters and if needed throw ArgumentNullException if (sourceDoc == null) { throw new ArgumentNullException("sourceDoc"); } if (sourceRoot == null) { throw new ArgumentNullException("sourceRoot"); } if (mergeRoot == null) { throw new ArgumentNullException("mergeRoot"); } #endregion if (!string.IsNullOrEmpty(mergeRoot.InnerText)) { sourceRoot.InnerText = mergeRoot.InnerText; } if (!string.IsNullOrEmpty(mergeRoot.Value)) { sourceRoot.Value = mergeRoot.Value; } #region Copy attributes... var mergeRootAttributes = mergeRoot.Attributes; if (mergeRootAttributes != null) { var mergeRootAttributesCount = mergeRootAttributes.Count; for (var k = 0; k &lt; mergeRootAttributesCount; k++) { var mergeAttribute = mergeRootAttributes[k]; var mergeAttributeName = mergeAttribute.LocalName; var sourceAttribute = sourceRoot.Attributes[mergeAttributeName] ?? sourceRoot.Attributes.Append( sourceDoc.CreateAttribute( mergeAttribute.Prefix, mergeAttribute.LocalName, mergeAttribute.NamespaceURI)); sourceAttribute.Value = mergeAttribute.Value; } } #endregion // loop child nodes... var mergeRootNodesCount = mergeRoot.ChildNodes.Count; for (var i = 0; i &lt; mergeRootNodesCount; i++) { XmlNode foundNode = null; var mergeNode = mergeRoot.ChildNodes[i]; var mergeNodeName = mergeNode.LocalName; var sourceRootNodeCount = sourceRoot.ChildNodes.Count; #region Find node in source... for (var j = 0; j &lt; sourceRootNodeCount; j++) { var sourceNode = sourceRoot.ChildNodes[j]; var sourceNodeName = sourceNode.LocalName; if ((isNetConfigFile &amp;&amp; mergeNodeName == "section" || mergeNodeName == "sectionGroup" ) || sourceNodeName != mergeNodeName) continue; foundNode = sourceNode; break; } #endregion #region create a new node... if (foundNode == null) { foundNode = sourceRoot.AppendChild( sourceDoc.CreateNode( mergeNode.NodeType, mergeNode.Prefix, mergeNode.LocalName, mergeNode.NamespaceURI)); } #endregion sourceDoc.Merge(foundNode, mergeNode); } } } } </code></pre>
 

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