Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Xml/System/Xml/Dom/XmlDomTextWriter.cs

@@ -0,0 +1,52 @@
+//------------------------------------------------------------------------------
+// <copyright file="XmlDomTextWriter.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+// <owner current="true" primary="true">[....]</owner>
+//------------------------------------------------------------------------------
+
+namespace System.Xml {
+
+    using System;
+    using System.IO;
+    using System.Text;
+    using System.Runtime.Versioning;
+
+    // Represents a writer that will make it possible to work with prefixes even
+    // if the namespace is not specified.
+    // This is not possible with XmlTextWriter. But this class inherits XmlTextWriter.
+    internal class XmlDOMTextWriter : XmlTextWriter {
+
+        public XmlDOMTextWriter( Stream w, Encoding encoding ) : base( w,encoding ) {
+        }
+
+        [ResourceConsumption(ResourceScope.Machine)]
+        [ResourceExposure(ResourceScope.Machine)]
+        public XmlDOMTextWriter( String filename, Encoding encoding ) : base( filename,encoding ){
+        }
+
+        public XmlDOMTextWriter( TextWriter w ) : base( w ){
+        }
+
+        // Overrides the baseclass implementation so that emptystring prefixes do
+        // do not fail if namespace is not specified.
+        public override void WriteStartElement( string prefix, string localName, string ns ){
+            if( ( ns.Length == 0 ) && ( prefix.Length != 0 ) )
+                prefix = "" ;
+
+            base.WriteStartElement( prefix, localName, ns );
+        }
+
+        // Overrides the baseclass implementation so that emptystring prefixes do
+        // do not fail if namespace is not specified.
+        public override  void WriteStartAttribute( string prefix, string localName, string ns ){
+            if( ( ns.Length == 0 ) && ( prefix.Length != 0 )  )
+                prefix = "" ;
+
+            base.WriteStartAttribute( prefix, localName, ns );
+        }
+    }
+}
+    
+
+