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在vs 2010中，右鍵單擊並更新指向我的xamlx工作流服務項目的服務引用，會引發錯誤（寫入原始的HTML）指出：更新xamlx-workflow服務引用拋出XamlObjectWriterException：'無法創建未知類型[...]'
XamlObjectWriterException： '無法創建未知類型[...]'
[...]指出我的項目的消息變量。
我的工作流是使用WorkflowServiceHost類託管的xamlx。
它似乎是由於SendResponse消息。消息類型使用[DataContract]和[DataMember]，並且在內容UI中選擇了「參數」。
找不到我的消息類型究竟是什麼東西。也許這是在我的wkf項目的建設屬性...
任何幫助是非常歡迎。
這裏是發回的HTML：
There was an error downloading 'http://localhost:8008/WfDerogationCreation.xamlx'.
There was an error downloading 'http://localhost:8008/WfDerogationCreation.xamlx'.
The request failed with the error message:
--
<html>
<head>
<title>'Cannot create unknown type '{http://schemas.microsoft.com/netfx/2009/xaml/activities}Variable({clr-namespace:CompanyName.WorkflowSecurity.Derogation.Messages;assembly=CompanyName.WorkflowSecurity}DerogRequest)'.' Line number '4' and line position '8'.</title>
<style>
body {font-family:"Verdana";font-weight:normal;font-size: .7em;color:black;}
p {font-family:"Verdana";font-weight:normal;color:black;margin-top: -5px}
b {font-family:"Verdana";font-weight:bold;color:black;margin-top: -5px}
H1 { font-family:"Verdana";font-weight:normal;font-size:18pt;color:red }
H2 { font-family:"Verdana";font-weight:normal;font-size:14pt;color:maroon }
pre {font-family:"Lucida Console";font-size: .9em}
.marker {font-weight: bold; color: black;text-decoration: none;}
.version {color: gray;}
.error {margin-bottom: 10px;}
.expandable { text-decoration:underline; font-weight:bold; color:navy; cursor:hand; }
</style>
</head>
<body bgcolor="white">
<span><H1>Server Error in '/' Application.<hr width=100% size=1 color=silver></H1>
<h4> <i>'Cannot create unknown type '{http://schemas.microsoft.com/netfx/2009/xaml/activities}Variable({clr-namespace:CompanyName.WorkflowSecurity.Derogation.Messages;assembly=CompanyName.WorkflowSecurity}DerogRequest)'.' Line number '4' and line position '8'.</i> </h4></span>
<font face="Arial, Helvetica, Geneva, SunSans-Regular, sans-serif ">
<b> Description: </b>An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
<br><br>
<b> Exception Details: </b>System.Xaml.XamlObjectWriterException: 'Cannot create unknown type '{http://schemas.microsoft.com/netfx/2009/xaml/activities}Variable({clr-namespace:CompanyName.WorkflowSecurity.Derogation.Messages;assembly=CompanyName.WorkflowSecurity}DerogRequest)'.' Line number '4' and line position '8'.<br><br>
<b>Source Error:</b> <br><br>
<table width=100% bgcolor="#ffffcc">
<tr>
<td>
<code>
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.</code>
</td>
</tr>
</table>
<br>
<b>Stack Trace:</b> <br><br>
<table width=100% bgcolor="#ffffcc">
<tr>
<td>
<code><pre>
[XamlObjectWriterException: 'Cannot create unknown type '{http://schemas.microsoft.com/netfx/2009/xaml/activities}Variable({clr-namespace:CompanyName.WorkflowSecurity.Derogation.Messages;assembly=CompanyName.WorkflowSecurity}DerogRequest)'.' Line number '4' and line position '8'.]
System.Xaml.XamlObjectWriter.WriteStartObject(XamlType xamlType) +1131129
System.Xaml.XamlWriter.WriteNode(XamlReader reader) +158
System.Xaml.XamlServices.Transform(XamlReader xamlReader, XamlWriter xamlWriter, Boolean closeWriter) +106
System.Xaml.XamlServices.Load(XamlReader xamlReader) +56
System.ServiceModel.Activities.Activation.WorkflowServiceHostFactory.CreateServiceHost(String constructorString, Uri[] baseAddresses) +302
System.ServiceModel.HostingManager.CreateService(String normalizedVirtualPath) +1461
System.ServiceModel.HostingManager.ActivateService(String normalizedVirtualPath) +44
System.ServiceModel.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath) +651
[ServiceActivationException: The service '/WfDerogationCreation.xamlx' cannot be activated due to an exception during compilation. The exception message is: 'Cannot create unknown type '{http://schemas.microsoft.com/netfx/2009/xaml/activities}Variable({clr-namespace:CompanyName.WorkflowSecurity.Derogation.Messages;assembly=CompanyName.WorkflowSecurity}DerogRequest)'.' Line number '4' and line position '8'..]
System.Runtime.AsyncResult.End(IAsyncResult result) +688590
System.ServiceModel.Activation.HostedHttpRequestAsyncResult.End(IAsyncResult result) +190
System.ServiceModel.Activation.HostedHttpRequestAsyncResult.ExecuteSynchronous(HttpApplication context, String routeServiceVirtualPath, Boolean flowContext, Boolean ensureWFService) +234
System.ServiceModel.Activation.HttpModule.ProcessRequest(Object sender, EventArgs e) +379
System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +148
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75
</pre></code>
</td>
</tr>
</table>
<br>
<hr width=100% size=1 color=silver>
<b>Version Information:</b> Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.237
</font>
</body>
</html>
<!--
[XamlObjectWriterException]: 'Cannot create unknown type '{http://schemas.microsoft.com/netfx/2009/xaml/activities}Variable({clr-namespace:CompanyName.WorkflowSecurity.Derogation.Messages;assembly=CompanyName.WorkflowSecurity}DerogRequest)'.' Line number '4' and line position '8'.
at System.Xaml.XamlObjectWriter.WriteStartObject(XamlType xamlType)
at System.Xaml.XamlWriter.WriteNode(XamlReader reader)
at System.Xaml.XamlServices.Transform(XamlReader xamlReader, XamlWriter xamlWriter, Boolean closeWriter)
at System.Xaml.XamlServices.Load(XamlReader xamlReader)
at System.ServiceModel.Activities.Activation.WorkflowServiceHostFactory.CreateServiceHost(String constructorString, Uri[] baseAddresses)
at System.ServiceModel.ServiceHostingEnvironment.HostingManager.CreateService(String normalizedVirtualPath)
at System.ServiceModel.ServiceHostingEnvironment.HostingManager.ActivateService(String normalizedVirtualPath)
at System.ServiceModel.ServiceHostingEnvironment.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath)
[ServiceActivationException]: The service '/WfDerogationCreation.xamlx' cannot be activated due to an exception during compilation. The exception message is: 'Cannot create unknown type '{http://schemas.microsoft.com/netfx/2009/xaml/activities}Variable({clr-namespace:CompanyName.WorkflowSecurity.Derogation.Messages;assembly=CompanyName.WorkflowSecurity}DerogRequest)'.' Line number '4' and line position '8'..
at System.Runtime.AsyncResult.End[TAsyncResult](IAsyncResult result)
at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.End(IAsyncResult result)
at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.ExecuteSynchronous(HttpApplication context, String routeServiceVirtualPath, Boolean flowContext, Boolean ensureWFService)
at System.ServiceModel.Activation.HttpModule.ProcessRequest(Object sender, EventArgs e)
at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
-->## Heading ##
--.
Metadata contains a reference that cannot be resolved: 'http://localhost:8008/WfDerogationCreation.xamlx'.
The server did not provide a meaningful reply; this might be caused by a contract mismatch, a premature session shutdown or an internal server error.
If the service is defined in the current solution, try building the solution and adding the service reference again.
您需要使用[Fusion log viewer。]（http://msdn.microsoft.com/en-us/library/e74a18c4（v = VS.100）.aspx）進行調試。只需確保運行它作爲管理員，打開日誌，然後重新啓動，然後再嘗試調試。您將看到CLR正在查找程序集的位置以及哪個版本，並從那裏確定它未找到的原因（如果您已安裝它）。 – Will