1 files changed, 46 insertions, 0 deletions
diff --git a/src/DotNetOpenAuth.Web/Clients/DictionaryExtensions.cs b/src/DotNetOpenAuth.Web/Clients/DictionaryExtensions.cs
new file mode 100644
index 0000000..517fc47
--- /dev/null
+++ b/src/DotNetOpenAuth.Web/Clients/DictionaryExtensions.cs
@@ -0,0 +1,46 @@
+using System;
+using System.Collections.Generic;
+using System.Xml.Linq;
+
+namespace DotNetOpenAuth.Web.Clients
+{
+    internal static class DictionaryExtensions
+    {
+        /// <summary>
+        /// Adds a key/value pair to the specified dictionary if the value is not null or empty.
+        /// </summary>
+        /// <param name="dictionary">The dictionary.</param>
+        /// <param name="key">The key.</param>
+        /// <param name="value">The value.</param>
+        public static void AddItemIfNotEmpty(this IDictionary<string, string> dictionary, string key, string value)
+        {
+            if (key == null)
+            {
+                throw new ArgumentNullException("key");
+            }
+
+            if (!String.IsNullOrEmpty(value))
+            {
+                dictionary[key] = value;
+            }
+        }
+
+        /// <summary>
+        /// Adds the value from an XDocument with the specified element name if it's not empty.
+        /// </summary>
+        /// <param name="dictionary">The dictionary.</param>
+        /// <param name="document">The document.</param>
+        /// <param name="elementName">Name of the element.</param>
+        public static void AddDataIfNotEmpty(
+            this Dictionary<string, string> dictionary,
+            XDocument document,
+            string elementName)
+        {
+            var element = document.Root.Element(elementName);
+            if (element != null)
+            {
+                dictionary.AddItemIfNotEmpty(elementName, element.Value);
+            }
+        }
+    }
+}