配置信息

<?xml version="1.0"?>
<configuration>

  <configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
  </configSections>

  <log4net>
    <root>
      <level value="ALL"/>
      <appender-ref ref="LogFileAppender"/>
    </root>
    <logger name="logger">
      <level value="DEBUG"/>
      <appender-ref ref="LogFileAppender"/>
    </logger>
    <appender name="LogFileAppender" type="log4net.Appender.RollingFileAppender,log4net">
      <param name="AppendToFile" value="true" />
      <param name="RollingStyle" value="Date" />
      <param name="DatePattern" value="yyyyMMdd" />
      <param name="StaticLogFileName" value="false" />
      <param name="File" type="" value="log\log" />

      <layout type="log4net.Layout.PatternLayout">
        <param name="Header" value="&#xD;&#xA;=======================Header=======================&#xD;&#xA;" />
        <param name="Footer" value="xD;&#xA;=======================Footer=======================&#xD;&#xA;" />
        <param name="ConversionPattern" value="%d [%t] %-5p %c [%x]  - %m%n"/>
      </layout>
    </appender>
  </log4net>

  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
  </startup>

  <!--WCF-->
  <appSettings>
    <add key="connStr" value="Data Source=XXX;Initial Catalog=XXX;User Id=XXX;Password=XXX"/>
  </appSettings>

  <system.serviceModel>
    <bindings>
      <basicHttpBinding>
        <binding name="userBllEndPoint" closeTimeout="00:01:00" openTimeout="00:01:00"
          receiveTimeout="00:10:00" sendTimeout="00:01:00" allowCookies="false"
          bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
          maxBufferSize="65536" maxBufferPoolSize="524288" maxReceivedMessageSize="65536"
          messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered"
          useDefaultWebProxy="true">
          <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
            maxBytesPerRead="4096" maxNameTableCharCount="16384" />
          <security mode="None">
            <transport clientCredentialType="None" proxyCredentialType="None"
              realm="" />
            <message clientCredentialType="UserName" algorithmSuite="Default" />
          </security>
        </binding>
        <binding name="examBllEndPoint" closeTimeout="00:01:00" openTimeout="00:01:00"
          receiveTimeout="00:10:00" sendTimeout="00:01:00" allowCookies="false"
          bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
          maxBufferSize="65536" maxBufferPoolSize="524288" maxReceivedMessageSize="65536"
          messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered"
          useDefaultWebProxy="true">
          <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
            maxBytesPerRead="4096" maxNameTableCharCount="16384" />
          <security mode="None">
            <transport clientCredentialType="None" proxyCredentialType="None"
              realm="" />
            <message clientCredentialType="UserName" algorithmSuite="Default" />
          </security>
        </binding>
      </basicHttpBinding>
    </bindings>
    <client>
      <endpoint address="http://localhost:2001/UserBll" binding="basicHttpBinding"
        bindingConfiguration="userBllEndPoint" contract="UserBllService.IUserBll"
        name="userBllEndPoint" />
      <endpoint address="http://localhost:2002/ExamBll" binding="basicHttpBinding"
        bindingConfiguration="examBllEndPoint" contract="ExamBllService.IExamBll"
        name="examBllEndPoint" />
    </client>
  </system.serviceModel>

</configuration>

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <connectionStrings>
    <add name="connStr" connectionString="Data Source=XXX;Initial Catalog=XXX;User Id=XXX;Password=XXX" providerName="System.Data.SqlClient"/>
  </connectionStrings>
</configuration>

读取：

        public static SqlConnection GetConnection()
        {
            string connStr = ConfigurationManager.AppSettings["connStr"];
            SqlConnection conn = new SqlConnection(connStr);
            return conn;
        }

读取：