Extract out IO namespace, Part 1

SabreTools.IO/XmlTextWriterExtensions.cs

@@ -0,0 +1,61 @@
+using System.Xml;
+
+namespace SabreTools.IO
+{
+    /// <summary>
+    /// Additional methods for XmlTextWriter
+    /// </summary>
+    public static class XmlTextWriterExtensions
+    {
+        /// <summary>
+        /// Write an attribute, forcing empty if null
+        /// </summary>
+        /// <param name="writer">XmlTextWriter to write out with</param>
+        /// <param name="localName">Name of the element</param>
+        /// <param name="value">Value to write in the element</param>
+        public static void WriteRequiredAttributeString(this XmlTextWriter writer, string localName, string value)
+        {
+            writer.WriteAttributeString(localName, value ?? string.Empty);
+        }
+
+        /// <summary>
+        /// Force writing separate open and start tags, even for empty elements
+        /// </summary>
+        /// <param name="writer">XmlTextWriter to write out with</param>
+        /// <param name="localName">Name of the element</param>
+        /// <param name="value">Value to write in the element</param>
+        public static void WriteRequiredElementString(this XmlTextWriter writer, string localName, string value)
+        {
+            writer.WriteStartElement(localName);
+            if (value == null)
+                writer.WriteRaw(string.Empty);
+            else
+                writer.WriteString(value);
+            writer.WriteFullEndElement();
+        }
+
+        /// <summary>
+        /// Write an attribute, if the value is not null or empty
+        /// </summary>
+        /// <param name="writer">XmlTextWriter to write out with</param>
+        /// <param name="localName">Name of the attribute</param>
+        /// <param name="value">Value to write in the attribute</param>
+        public static void WriteOptionalAttributeString(this XmlTextWriter writer, string localName, string value)
+        {
+            if (!string.IsNullOrEmpty(value))
+                writer.WriteAttributeString(localName, value);
+        }
+
+        /// <summary>
+        /// Write an element, if the value is not null or empty
+        /// </summary>
+        /// <param name="writer">XmlTextWriter to write out with</param>
+        /// <param name="localName">Name of the element</param>
+        /// <param name="value">Value to write in the element</param>
+        public static void WriteOptionalElementString(this XmlTextWriter writer, string localName, string value)
+        {
+            if (!string.IsNullOrEmpty(value))
+                writer.WriteElementString(localName, value);
+        }
+    }
+}