挿入GUIDはNLOG

Question

と私はエラー

Exception occurred in NLog ---> System.Data.SqlClient.SqlException: Conversion failed when converting from a character string to uniqueidentifier. 

を取得しています。

<?xml version="1.0" encoding="utf-8" ?> 
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd" 
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
     throwExceptions="true" internalLogFile="C:\Development\Projects\Pearson\ARIES\Development\Websites\ARIES.Web\NLog.log" internalLogLevel="Debug" > 

    <!-- make sure to set 'Copy To Output Directory' option for this file --> 
    <!-- go to http://nlog-project.org/wiki/Configuration_file for more information --> 

    <targets> 
     <target xsi:type="AsyncWrapper" queueLimit="2000" overflowAction="Grow" name="AsyncWrapperLogger" batchSize="1000"> 
      <target xsi:type="Database" 
        name="Database" 
        connectionStringName="ApplicationServices"> 
       <commandText> 
        insert into Logs(UserId, Level, Message, Exception, StackTrace, DateCreated) values(CASE WHEN @UserId IS NOT NULL AND @UserId = CAST('00000000-0000-0000-0000-000000000000' AS uniqueidentifier) THEN @UserId ELSE @UserId END, @Level, @Message, @Exception, @StackTrace, @DateCreated); 
       </commandText> 
       <parameter name="@UserId" layout="${event-context:item=${guid:format=UserId}}"/> 
       <parameter name="@Level" layout="${level}"/> 
       <parameter name="@Message" layout="${message}"/> 
       <parameter name="@Exception" layout="${exception}"/> 
       <parameter name="@StackTrace" layout="${stacktrace}"/> 
       <parameter name="@DateCreated" layout="${date}"/> 
      </target> 
     </target> 
    </targets> 

    <rules> 
     <logger name="*" writeTo="Database"/> 
    </rules> 
</nlog> 

public static void Write(string message, Exception ex) 
     { 
      var logEventInfo = new LogEventInfo(NLog.LogLevel.Error, "", message); 

      if (HttpContext.Current != null) 
      { 
       logEventInfo.Properties.Add("UserId", Guid.NewGuid()); 
      } 

      logEventInfo.Exception = ex; 

      logger.Log(logEventInfo); 
     } 

Answer 1

SQLプロファイラを使用して修正しました。空のGUIDの文字列を送信していました。

insert into Logs(UserId, Level, Message, Exception, StackTrace, DateCreated) values(CASE WHEN @UserId = '' THEN NULL ELSE convert(uniqueidentifier, @UserId) END, @Level, @Message, @Exception, @StackTrace, @DateCreated);