We are using lateast Mongodb c# driver(2.0.0) which is downloaded through nuget to connect to a MongoDB replicaset(3.0.2).

From time to time, the driver will throw an exception "Cannot access a disposed object.Object name: 'ClusterableServer'." while we quering all the documents if we set the readPreference to primaryPreferred or secondary or secondaryPreferred.

Detail exception: at MongoDB.Driver.Core.Servers.ClusterableServer.ThrowIfDisposed() at MongoDB.Driver.Core.Servers.ClusterableServer.ThrowIfNotOpen() at MongoDB.Driver.Core.Servers.ClusterableServer.d__0.MoveNext() — End of stack trace from previous location where exception was thrown — at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.ConfiguredTaskAwaitable1.ConfiguredTaskAwaiter.GetResult()
at MongoDB.Driver.Core.Operations.AsyncCursor1.d__0.MoveNext() — End of stack trace from previous location where exception was thrown — at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.ConfiguredTaskAwaitable1.ConfiguredTaskAwaiter.GetResult()
at MongoDB.Driver.Core.Operations.AsyncCursor1.d__b.MoveNext() — End of stack trace from previous location where exception was thrown — at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter1.GetResult()
at MongoDB.Driver.Sync.AsyncCursorEnumeratorAdapter1.d__0.MoveNext() at System.Collections.Generic.List1..ctor(IEnumerable1 collection) at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source) at TryMongoReplica.Program.Main(String[] args) in d:\Practice\TryMongoReplica\TryMongoReplica\Program.cs:line 47 at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart()