Serializing result of a LINQ IEnumerable
I have a simple value type:
[Serializable]
private struct TimerInstance
{
public TimerInstance(string str, long nTicks)
{
_name = str;
_ticks = nTicks;
}
private readonly string _name;
private readonly long _ticks;
public string Name { get { return _name; } }
public long Ticks { get { return _ticks; } }
public override string ToString()
{
return string.Format("{0,20}: {1,10:N}", Name, Ticks);
}
}
which as you'll note is serializable. Then I have a list of these:
static private List<TimerInstance> _Timers = new List<TimerInstance>();
and a LINQ method to eliminate the bottom 5% and top 5% of timers from the list:
// Return items that should be persisted. By convention, we are eliminating the "outlier"
// values which I've defined as the top and bottom 5% of timer values.
private static IEnumerable<TimerInstance> ItemsToPersist()
{
// Eliminate top and bottom 5% of timers from the enumeration. Figure out how many items
// to skip on both ends.
int iFivePercentOfTimers = _Timers.Count / 20;
int iNinetyPercentOfTimers = _Timers.Count - iFivePercentOfTimers * 2;
return (from x in _Timers
orderby x.Ticks descending
select x).Skip(iFivePercentOfTimers).Take(iNinetyPercentOfTimers);
}
I then am trying to Seralize to XML the result of this enumeration, i.e. serialize just the values of the timers in the middle 90%, eliminating the top and bottom 5%:
// Serialize the timer list as XML to a stream - for storing in an Azure Blob
public static void SerializeTimersToStream(Stream s)
{
BinaryFormatter f = new BinaryFormatter();
f.Serialize(s, ItemsToPersist());
}
The problem is that when this code executes, I get this:
A first chance exception of type 'System.Runtime.Serialization.SerializationException' occurred in mscorlib.dll Microsoft.WindowsAzure.ServiceRuntime Critical: 1 : Unhandled Exception: System.Runtime.Serialization.SerializationException: Type 'System.Linq.Enumerable+d__3a`1[[TracePerfWorker.TraceTimer+TimerInstance, TracePerfWorker, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]' in Assembly 'System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' is not marked as serializable. at System.Runtime.Serialization.FormatterServices.Int开发者_Go百科ernalGetSerializableMembers(RuntimeType type) at System.Runtime.Serialization.FormatterServices.GetSerializableMembers(Type type, StreamingContext context) at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitMemberInfo() at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitSerialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter, SerializationBinder binder) at System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.Serialize(Object obj, ISurrogateSelector surrogateSelector, StreamingContext context, SerObjectInfoInit serObjectInfoInit, IFormatterConverter converter, ObjectWriter objectWriter, SerializationBinder binder) at System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Serialize(Object graph, Header[] inHeaders, __BinaryWriter serWriter, Boolean fCheck) at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream serializationStream, Object graph, Header[] headers, Boolean fCheck) at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream serializationStream, Object graph) at TracePerfWorker.TraceTimer.SerializeTimersToStream(Stream s) in c:\Users\Mike\Documents\Visual Studio 2010\Projects\AzureTracePerfTest\TracePerfWorker\TraceTimer.cs:line 88 at TracePerfWorker.WorkerRole.SerializeTimersToBlob(String strTimerGroupName) in c:\Users\Mike\Documents\Visual Studio 2010\Projects\AzureTracePerfTest\TracePerfWorker\WorkerRole.cs:line 192 at TracePerfWorker.WorkerRole.DoWorkNoTrace() in c:\Users\Mike\Documents\Visual Studio 2010\Projects\AzureTracePerfTest\TracePerfWorker\WorkerRole.cs:line 153 at TracePerfWorker.WorkerRole.Run() in c:\Users\Mike\Documents\Visual Studio 2010\Projects\AzureTracePerfTest\TracePerfWorker\WorkerRole.cs:line 77 at Microsoft.WindowsAzure.ServiceRuntime.RoleEnvironment.StartRoleInternal() at Microsoft.WindowsAzure.ServiceRuntime.RoleEnvironment.StartRole() at Microsoft.WindowsAzure.ServiceRuntime.Implementation.Loader.RoleRuntimeBridge.b__1() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart()
I think I get what this is telling me - the implicit class that the enumerator has apparently generated ('System.Linq.Enumerable+d__3a`1[[TracePerfWorker.TraceTimer+TimerInstance, TracePerfWorker') is not itself marked as serializable.
But this seems like a really common situation, where I'm taking a serializable value type (TimerInstance), and just building a LINQ query over a list of these values, i.e. the enumerator is just returning TimerInstance values - how do I then convince it that what the enumerator is returning is just a list of TimerInstance values, which are serializable?
How about using ToList to get a list of items before you call serialize?
Your method will need to be changed to return a List<TimerInstance>
instead of IEnumerable<TimerInstance>
http://msdn.microsoft.com/en-us/library/bb342261.aspx
精彩评论