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POWhy do I get a SerializationException if I do not copy my .NET dll into the Office application folder?
 

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  1. POWhy do I get a SerializationException if I do not copy my .NET dll into the Office application folder?
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    <p>I am referencing a C# dll from Excel VBA. This C# dll connects to a .NET Remote Service. One of the types that the Remote Service passes as a parameter, TSConditionList, is contained in general.dll. If I do not copy general.dll to the Office application folder then I get a serialization exception, because the SoapFormatter doesn't have the correct type information.</p> <hr> <p>My C# dll is TarsanExcelConnector.dll. I use REGASM to register this C# dll at the fixed location 'C:\TarsanExcelConnector'.</p> <p>C:\Windows\Microsoft.NET\Framework\v4.0.30319\Regasm.exe TarsanExcelConnector.dll /codebase /tlb:TarsanExcelConnector.tlb</p> <p>In the 'C:\TarsanExcelConnector' directory I have a number of DLL's that are referenced by TarsanExcelConnector.dll:</p> <ul> <li>general.dll</li> <li>TradeSourceParsers.dll</li> <li>TradeSourcePureDataAdapter.dll</li> </ul> <p>All three of these assemblies are correctly located and loaded into the AppDomain.</p> <p>My VBA code is as follows:</p> <pre><code>Public Function GetTradesDebug(url As String, conditionList() As Variant, contextMap() As Variant) As String Dim TTSConnection As New TarsanExcelConnector.TarsanExcelConnector GetTradesDebug = TTSConnection.GetTradesDebug(url, conditionList, contextMap) End Function </code></pre> <p>This fails with the following exception:</p> <pre><code>System.Runtime.Serialization.SerializationException: Invalid method signature 'a1:TSConditionList a2:StringDictionary'. Server stack trace: at System.Runtime.Serialization.Formatters.Soap.SoapHandler.ProcessType(ParseRecord pr, ParseRecord objectPr) at System.Runtime.Serialization.Formatters.Soap.SoapHandler.ProcessAttributes(ParseRecord pr, ParseRecord objectPr) at System.Runtime.Serialization.Formatters.Soap.SoapHandler.EndElement(String prefix, String name, String urn) at System.Runtime.Serialization.Formatters.Soap.SoapParser.ParseXml() at System.Runtime.Serialization.Formatters.Soap.SoapParser.Run() at System.Runtime.Serialization.Formatters.Soap.ObjectReader.Deserialize (HeaderHandler handler, ISerParser serParser) at System.Runtime.Serialization.Formatters.Soap.SoapFormatter.Deserialize(Stream serializationStream, HeaderHandler handler) at System.Runtime.Remoting.Channels.CoreChannel.DeserializeSoapResponseMessage(Stream inputStream, IMessage requestMsg, Header[] h, Boolean bStrictBinding) at System.Runtime.Remoting.Channels.SoapClientFormatterSink.DeserializeMessage(IMethodCallMessage mcm, ITransportHeaders headers, Stream stream) at System.Runtime.Remoting.Channels.SoapClientFormatterSink.SyncProcessMessage(IMessage msg) Exception rethrown at [0]: at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData&amp; msgData, Int32 type) at GFX.Services.ITradeSourceService.GetTrades(TSConditionList conditionList, StringDictionary contextMap) at GFX.Services.Pure.TradeSourceClient.GetTrades(TSConditionList conditionList, StringDictionary contextMap) at TTSConnector.TarsanTradeSourceConnector.GetTrades(String tssUrl, Object[,] tssConditionList, Object[,] tssContextMap) in C:\new_code\TTSConnector\TTSConnector\TarsanTradeSourceConnector.cs:line 99 at TTSConnector.TarsanTradeSourceConnector.GetTradesDebug(String tssUrl, Object[,] tssConditionList, Object[,] tssContextMap) in C:\new_code\TTSConnector\TTSConnector\TarsanTradeSourceConnector.cs:line 66 </code></pre> <hr> <p>If I copy general.dll into the office application directory then I do not get this exception. </p> <p>For Windows 7/Excel 2010 I copy to here: C:\Program Files (x86)\Microsoft Office\Office14\general.dll</p> <p>For Windows XP/Excel 2003 I copy to here: C:\Program Files\Microsoft Office\Office11\general.dll</p> <p>I don't understand why the SoapFormatter is not seeing the general.dll in the 'C:\TarsanExcelConnector' directory?? If I check the assemblies that are loaded into the AppDomain I can see that it is definately loading the assembly from 'C:/TarsanExcelConnector/general.DLL'.</p> <hr> <p>When I wrote some test methods to find the troublesome type, the much more useful SerializationException I got was something like this: 'Parse Error, no assembly associated with Xml key TSConditionList'. This type is contained in general.dll.</p> <p>If the runtime loads the assembly from C:\TarsanExcelConnector then it can't find the type. If the runtime loads the assembly from the Office directory, then the Serialization succeeds. WHY?</p>
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