为什么ConfigurationManager.OpenMappedExeConfiguration有一个不在文件中的额外连接字符串？

Question

我正在测试我的配置文件以获取win表单应用程序.在LocalTestRun.testrunco​​nfig中,我将其设置为复制app.config.我已经检查了Environment.CurrentDirectory测试运行的时间,文件也没有这个额外的连接字符串.这是测试方法:

[TestMethod]
    public void Configuration_ConnectionStrings_Connect()
    {
        Console.WriteLine(Environment.CurrentDirectory);
        Assert.IsTrue(System.IO.File.Exists("App.Config"));
        var configFileMap = new ExeConfigurationFileMap(){ ExeConfigFilename = "App.Config"};

      var config=  ConfigurationManager.OpenMappedExeConfiguration(configFileMap, ConfigurationUserLevel.None);

       foreach (ConnectionStringSettings connectionString in config.ConnectionStrings.ConnectionStrings)
        {
           //Assumes all connections are to Sql server, test must be updated if not
            Assert.AreEqual("System.Data.SqlClient",connectionString.ProviderName,"Test was only designed for SQL clients");
         using (var cn=new System.Data.SqlClient.SqlConnection(connectionString.ConnectionString))
         {
             cn.Open();
             Assert.AreEqual(System.Data.ConnectionState.Open,cn.State);
         }
        }

    }

但是,当我迭代时,config.ConnectionStrings.ConnectionStrings我有一个不在文件中的额外配置字符串:

data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|aspnetdb.mdf;User Instance=true

这不是,也从来不是一个asp.net项目.

这是配置文件:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
    <sectionGroup name="userSettings" type="System.Configuration.UserSettingsGroup, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
        <section name="HLIT_Ticketing.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" allowExeDefinition="MachineToLocalUser" requirePermission="false" />
    </sectionGroup>
</configSections>
<connectionStrings>
    <add name="HLIT_Ticketing.Properties.Settings.HomeQConnectionString"
        connectionString="Data Source=******\*****;Initial Catalog=*****;Persist Security Info=True;User ID=*****;Password=******"
        providerName="System.Data.SqlClient" />
</connectionStrings>
<userSettings>
    <HLIT_Ticketing.Properties.Settings>
        <setting name="AssociateRole" serializeAs="String">
            <value>Associate</value>
        </setting>
        <setting name="DeveloperRole" serializeAs="String">
            <value>Developer</value>
        </setting>
    </HLIT_Ticketing.Properties.Settings>
</userSettings>

这个额外的连接字符串来自哪里？

Answer 1

该连接字符串在机器级配置文件machine.config中定义.

如果查看该文件C:\Windows\Microsoft.NET\Framework\v2.0.50727\CONFIG\machine.config,您将看到以下部分:

<connectionStrings>
    <add name="LocalSqlServer" connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|aspnetdb.mdf;User Instance=true" providerName="System.Data.SqlClient"/>
</connectionStrings>

Answer 2

戴夫坚持主要答案 - upvoted.

但是:如果你想从machine.config或任何"上游"web.configs中删除任何连接字符串,你总是可以使用:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <connectionStrings>
        <clear />
        <add name="HLIT_Ticketing.Properties.Settings.HomeQConnectionString"
             connectionString="Data Source=******\*****;Initial Catalog=*****;Persist Security Info=True;User ID=*****;Password=******"
             providerName="System.Data.SqlClient" />
    </connectionStrings>

首先<clear/>在连接字符串部分划出任何先前存在的连接字符串,并用干净的石板开始.