Fix static variables not being initialized in derived class HttpWebRequest (#88)

Author: RalfMengwasser

source/nanoFramework.System.Net.Http/Http/System.Net.HttpWebRequest.cs

@@ -112,6 +112,10 @@ static private void CheckPersistentConnections(object unused)
         /// </summary>
         static HttpWebRequest()
         {
+            // The static constructor of the base class does not get called before the derived static constructor
+            // so you have to make sure the base class gets initialized in any case if you want to use "RegisterPrefix"
+            Initialize();
+
             // Creates instance of HttpRequestCreator. HttpRequestCreator creates HttpWebRequest
             HttpRequestCreator Creator = new HttpRequestCreator();
             // Register prefix. HttpWebRequest handles both http and https

source/nanoFramework.System.Net.Http/Http/System.Net.WebRequest.cs

@@ -25,10 +25,10 @@ public abstract class WebRequest : MarshalByRefObject, IDisposable
         // (ASP .NET is 90 seconds)
 
         // Lock to syncronize update of s_PrefixList
-        private static object g_listLock = new object();
+        private static object g_listLock;
         // List of WebRequestPrefixElement that keeps prefix ( string ) and
         // IWebRequestCreate
-        private static ArrayList s_PrefixList = new ArrayList();
+        private static ArrayList s_PrefixList;
 
         private static IWebProxy s_defaultProxy = null;
 
@@ -38,7 +38,27 @@ public abstract class WebRequest : MarshalByRefObject, IDisposable
         /// </summary>
         protected WebRequest()
         {
+        }
+
+        /// <summary>
+        /// Static constructor to initialize the static variables before the class is used
+        /// </summary>
+        static WebRequest()
+        {
+            Initialize();
+        }
 
+        /// <summary>
+        /// Initialize has to be called before the class is used.
+        /// Normally should be called by the constructor above.
+        /// </summary>
+        public static void Initialize()
+        {
+            if (g_listLock == null)
+            {
+                g_listLock = new object();
+                s_PrefixList = new ArrayList();
+            }
         }
 
         ~WebRequest()