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.net Core 2.0的NLog数据库目标

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我正在尝试使用.net Core 2.0中的NLog将各种日志写入数据库和文件 . 问题是，将日志写入文件工作完全正常 . 但是在将日志写入数据库时总是会出现以下错误：

2018-01-10 08：48：29.5666错误初始化目标'数据库目标[db]'时出错 . 异常：System.TypeLoadException：无法从程序集'NLog，Version = 4.0.0.0，Culture = neutral，PublicKeyToken = 5120e14c03d0593c'加载类型'System.Data.SqlClient' . at System.RuntimeTypeHandle.GetTypeByName（String name，Boolean throwOnError，Boolean ignoreCase，Boolean reflectionOnly，StackCrawlMarkHandle stackMark，IntPtr pPrivHostBinder，Boolean loadTypeFromPartialName，ObjectHandleOnStack type，ObjectHandleOnStack keepalive）at System.RuntimeTypeHandle.GetTypeByName（String name，Boolean throwOnError，Boolean ignoreCase，布局reflectionOnly，StackCrawlMark＆stackMark，IntPtr pPrivHostBinder，Boolean loadTypeFromPartialName）System.RuntimeType.GetType（String typeName，Boolean throwOnError，Boolean ignoreCase，Boolean reflectionOnly，StackCrawlMark＆stackMark），位于NLog的System.Type.GetType（String typeName，Boolean throwOnError） . 在NLog.Targets.Titget.Initialize（LoggingConfiguration配置）的NLog.Targets.DatabaseTarget.InitializeTarget（）中的Targets.DatabaseTarget.SetConnectionType（）

但我的项目中有 System.Data.SqlClient 如下：

<ItemGroup>
    <PackageReference Include="EPPlus.Core" Version="1.5.4" />
    <PackageReference Include="Microsoft.ApplicationInsights.AspNetCore" Version="2.2.0-beta3" />
    <PackageReference Include="Microsoft.AspNetCore.All" Version="2.0.3" />
    <PackageReference Include="Microsoft.AspNetCore.Authentication.Cookies" Version="2.0.1" />
    <PackageReference Include="Microsoft.AspNetCore.Cors" Version="2.0.1" />
    <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="2.0.1" />
    <PackageReference Include="Microsoft.AspNetCore.Session" Version="2.0.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="2.0.1" PrivateAssets="All" />
    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="2.0.1" PrivateAssets="All" />
    <PackageReference Include="NLog" Version="4.5.0-rc03" />
    <PackageReference Include="NLog.Web.AspNetCore" Version="4.5.0-rc2" />
    <PackageReference Include="System.ComponentModel" Version="4.3.0" />
    <PackageReference Include="System.Configuration.ConfigurationManager" Version="4.5.0-preview1-25914-04" />
    <PackageReference Include="System.Data.SqlClient" Version="4.4.2" />
</ItemGroup>

我的NLOG代码：

<?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" autoReload="true" internalLogLevel="info" internalLogFile="C:\*****\Log2\asdaf.log">
<targets>
    <target
        xsi:type="File"
        name="allfile"
        fileName="C:\*****\Logs\${shortdate}.log"
        layout="${longdate}|${event-properties:item=EventId.Id}|${uppercase:${level}}|${logger}|${message} ${exception}" >
    </target> 

    <target xsi:type="Database" name="db">
        <commandText>INSERT INTO [LogEntries](TimeStamp, Message, Level, Logger) VALUES(getutcdate(), @msg, @level, @logger)</commandText>
        <parameter name="@msg" layout="${message}" />
        <parameter name="@level" layout="${level}" />
        <parameter name="@logger" layout="${logger}" />
        <dbProvider>System.Data.SqlClient</dbProvider>
        <connectionString>*****</connectionString>
    </target>

    <target xsi:type="Null" name="blackhole" />
</targets>
<rules>
    <logger name="*" minlevel="Trace" writeTo="allOutputs" />
    <logger name="Microsoft.*" minlevel="Trace" writeTo="blackhole" final="true" />
    <logger name="*" minlevel="Trace" writeTo="ownFile-web" />
</rules>
</nlog>

我在Github上搜索了这个问题，但没有一个解决方案适合我 . 从Nuget获取System.Data.SqlClient应该已经足够了，但不幸的是，Nlog.config先生想要其他的东西而且我找不到什么 .

c# nlog asp.net-core-2.0

1 回答

  • 4

    这是因为我为我的数据库目标写了 <dbProvider>System.Data.SqlClient</dbProvider> . 看起来有人应该更新文档 .

    顺便说一下，我不知道为什么删除dbProvider对我有用 .

    工作代码如下：

    <?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" autoReload="true" internalLogLevel="info" internalLogFile="C:\Users\maliozt\source\MyProjects\MapApplication\MapApplication\Log2\asdaf.log">
<targets>
    <target
    xsi:type="File"
    name="mapFile"
    fileName="C:\Users\maliozt\source\MyProjects\MapApplication\MapApplication\Logs\${shortdate}.log"
    layout="${longdate}|${event-properties:item=EventId.Id}|${uppercase:${level}}|${logger}|${message} ${exception}" >
    </target>

    <target 
    xsi:type="Database" 
    name="mapDataBase">
        <commandText>INSERT INTO MapApplication.dbo.LogEntries(TimeStamp, Message, Level, Logger) VALUES(GETDATE(), @message, @level, @logger)</commandText>
        <parameter name="@message" layout="${message}" />
        <parameter name="@level" layout="${level}" />
        <parameter name="@logger" layout="${logger}" />
        <!--<dbProvider>System.Data.SqlClient</dbProvider>-->
        <connectionString>Data Source=(localdb)\MSSQLLocalDB;Initial Catalog=master;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=True;ApplicationIntent=ReadWrite;MultiSubnetFailover=False</connectionString>
    </target>
</targets>
<rules>
    <logger name="*" minlevel="Warn" writeTo="mapFile" />
    <logger name="*" minlevel="Error" writeTo="mapDataBase" />
</rules>
</nlog>
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