在web.config文件中使用两次连接字符串;另一个用于Nlog配置

Question

我在我的项目中使用nlog。我的web.config看起来像这样：

<connectionStrings>
  <add name="SQL_ConnStr" connectionString="Initial Catalog=ConfigDB;Provider=SQLOLEDB; Data Source=mysqlserver; User ID=sa; Password=sa; Persist Security Info=True;"/>
</connectionStrings>
...
<nlog>
<targets>
  <target name="database" type="Database" dbProvider="sqlserver" **connectstring="Initial Catalog=ConfigDB;Provider=SQLOLEDB; Data Source=mysqlserver; User ID=sa; Password=sa"** commandText="INSERT INTO ...">
</target>
</targets>
<rules>
<logger name="*" minlevel="Debug" writeTo="database"/>
</rules>
</nlog>

两个相同的连接字符串！我的问题是如何只保留一个连接字符串？

Answer 1

首先将add providerName属性添加到连接字符串。然后使用connectionStringName而不是connectionString，并从设置中引用连接字符串。

<connectionStrings>
  <add name="SQL_ConnStr" 
       providerName="System.Data.SqlClient"
       connectionString="Initial Catalog=ConfigDB;Provider=SQLOLEDB; Data Source=mysqlserver; User ID=sa; Password=sa; Persist Security Info=True;"/>
</connectionStrings>
...
<nlog>
  <targets>
    <target name="database" 
            type="Database" 
            dbProvider="sqlserver"
            connectionStringName="SQL_ConnStr" 
            commandText="INSERT INTO ...">
    </target>
  </targets>
  <rules>
    <logger name="*" 
            minlevel="Debug" 
            writeTo="database"/>
  </rules>
</nlog>

Answer 2

应该可以使用目标元素的属性ConnectionStringName。

例如：

<targets>
  <target name="database" type="Database" connectionStringName="SQL_ConnStr" commandText="INSERT INTO ...">
</target>

这将直接从connectionstrings部分访问连接字符串。