当将NLog与ASP.NET Core和SQLite一起使用时，参数为空(或未提供给CommandText)

Parameters empty (or not supplied to CommandText) when using NLog with ASP.NET Core and SQLite

我已经使用文档中的示例在ASP.NET Core MVC应用程序中设置了NLog。登录到文件(target = file)可以正常进行。

但是，登录到Sqlite数据库会导致异常：

2018-10-30 20:04:41.4394 Error DatabaseTarget(Name=db): Error when
writing to database. Exception: System.InvalidOperationException: Must
add values for the following parameters: @MachineName, @Logged,
@Level, @Message, @Logger, @Callsite, @Exception at
Microsoft.Data.Sqlite.SqliteCommand.ExecuteReader(CommandBehavior
behavior) at Microsoft.Data.Sqlite.SqliteCommand.ExecuteNonQuery()
at NLog.Targets.DatabaseTarget.WriteEventToDatabase(LogEventInfo
logEvent) at NLog.Targets.DatabaseTarget.Write(LogEventInfo
logEvent)

有什么想法为什么这些参数的值是空的？还是根本不传递参数？

NLog配置文件：

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<?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">

<targets>
<target xsi:type="File" name="file" fileName="nlog-${shortdate}.log"
layout="${longdate}|${machinename}|${level:upperCase=true}|${logger}|${callsite}|${message} ${exception:tostring}" />

<target xsi:type="Database"
name="db"
dbProvider="Microsoft.Data.Sqlite.SqliteConnection, Microsoft.Data.Sqlite"
connectionString="Data Source=database.db;">

<commandText>
INSERT INTO Log (MachineName, Logged, Level, Message, Logger, CallSite, Exception)
VALUES (@MachineName, @Logged, @Level, @Message, @Logger, @Callsite, @Exception);
</commandText>

<parameter name="@MachineName" layout="${machinename}" />
<parameter name="@Logged" layout="${longdate}" />
<parameter name="@Level" layout="${level:upperCase=true}" />
<parameter name="@Message" layout="${message}" />
<parameter name="@Logger" layout="${logger}" />
<parameter name="@CallSite" layout="${callsite}" />
<parameter name="@Exception" layout="${exception:tostring}" />
</target>
</targets>

<rules>
<logger name="*" minlevel="Trace" writeTo="file" />
<logger name="*" minlevel="Info" writeTo="db" />
</rules>
</nlog>