added full support for Azure Partial Trust and enabled ASP.NET Medium Trust with a client defined permissions file.

Author: craiggwilson

Bson/ObjectModel/ObjectId.cs

@@ -17,7 +17,10 @@
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Security;
 using System.Security.Cryptography;
+using System.Security.Permissions;
 using System.Text;
 using System.Threading;
 
@@ -48,8 +51,18 @@ public struct ObjectId : IComparable<ObjectId>, IEquatable<ObjectId>
         static ObjectId()
         {
             __staticMachine = GetMachineHash();
-            __staticPid = (short)Process.GetCurrentProcess().Id; // use low order two bytes only
             __staticIncrement = (new Random()).Next();
+
+            try
+            {
+                // we are testing for FullTrust here and, if we have it, then we use the current process' id.
+                new PermissionSet(PermissionState.Unrestricted).Demand();
+                SetPidToCurrentProcessId();
+            }
+            catch (SecurityException)
+            {
+                __staticPid = (short)0;
+            }
         }
 
         // constructors
@@ -364,6 +377,12 @@ private static int GetTimestampFromDateTime(DateTime timestamp)
             return (int)Math.Floor((BsonUtils.ToUniversalTime(timestamp) - BsonConstants.UnixEpoch).TotalSeconds);
         }
 
+        [MethodImpl(MethodImplOptions.NoInlining)]
+        private static void SetPidToCurrentProcessId()
+        {
+            __staticPid = (short)Process.GetCurrentProcess().Id;
+        }
+
         // public methods
         /// <summary>
         /// Compares this ObjectId to another ObjectId.

GlobalAssemblyInfo.cs

@@ -16,11 +16,13 @@
 using System.Reflection;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
+using System.Security;
 
 [assembly: AssemblyCompany("10gen Inc.")]
 [assembly: AssemblyCopyright("Copyright © 2010-2012 10gen Inc.")]
 [assembly: AssemblyTrademark("")]
 [assembly: AssemblyCulture("")]
+[assembly: AllowPartiallyTrustedCallers]
 
 // Setting ComVisible to false makes the types in this assembly not visible 
 // to COM components.  If you need to access a type in this assembly from