正在将消息写入应用程序事件日志

我在向Windows事件日志写入事件时遇到问题。我已经浏览了这些帖子，我认为我做得对，但我仍然在事件查看器中得到以下错误：

消息资源存在，但在字符串/消息表中找不到消息

有人知道我遗漏了什么吗？

我正在WIX安装程序中创建事件源：

<Fragment>
    <PropertyRef Id="NETFRAMEWORK35"/>
    <PropertyRef Id="NETFRAMEWORK20"/>
    <PropertyRef Id="NETFRAMEWORK20INSTALLROOTDIR"/>
    <PropertyRef Id="NETFRAMEWORK20INSTALLROOTDIR64" />
    <Component Id='EventSource'
               Directory='INSTALLDIR'
               Guid='F382AAC5-F7C5-46A4-95CF-EA7724DXXXXX' >
        <Condition>ALLUSERS</Condition>
        <?if $(var.Platform) = x64 ?>
            <util:EventSource Log='Application'
                    Name='MySource'
                    EventMessageFile='[NETFRAMEWORK20INSTALLROOTDIR64]EventLogMessages.dll'
                    KeyPath='yes' />
        <?else ?>
            <util:EventSource Log='Application'
                    Name='MySource'
                    EventMessageFile='[NETFRAMEWORK20INSTALLROOTDIR]EventLogMessages.dll'
                    KeyPath='yes' />
        <?endif ?>
    </Component>
</Fragment>

这是我在事件日志中写入的C#代码：

public class Log
{
    private const string EventSource = "MySource";
    private const string EventLog = "Application";
    private static EventLog _logger = null;
    private static void InitLogger()
    {
        if (!System.Diagnostics.EventLog.SourceExists(EventSource))
        {
            System.Diagnostics.EventLog.CreateEventSource(EventSource, EventLog);
        }
        _logger = new EventLog() { Source = EventSource, Log = EventLog };
    }
    public static void Write(EventLogEntryType entryType, string format, params object[] args)
    {
        string entry = _Format(format, args);
        try
        {
            if (_logger == null)
                InitLogger();
            _logger.WriteEntry(entry, entryType, 1);
        }
        catch (Exception ex)
        {
            Tracer.Misc.Error("Could not write to event log: {0}", entry);
        }
    }
    private static string _Format(string format, object[] args)
    {
        if ((args == null) || (args.Length == 0))
            return format;
        try
        {
            return String.Format(format, args);
        }
        catch (Exception e)
        {
            return format + " [Format Exception:" + e.Message + "]";
        }
    }
}