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我总是收到错误消息“无法建立与数据库的连接。如果您尚未创建 SQL Server 数据库,请退出网站管理工具,使用 aspnet_regsql 命令行实用程序创建和配置数据库,然后然后返回此工具设置提供程序。 ” 我已经创建并配置了数据库,但问题仍然存在。下面我分享我的 web.config 代码

<configuration>
  <connectionStrings>
    <clear/>
    <add name="LocalSqlServer" connectionString="Data Source=(localdb)\MSSQLLocalDB;Initial catalog=login;Integrated Security=True"
      providerName="System.Data.SqlClient" /> 
  </connectionStrings>
  <appSettings>
    <add key="ValidationSettings:UnobtrusiveValidationMode" value="None"/>
  </appSettings>
    <system.web>
      <roleManager enabled="true" />
      <authentication mode="Forms"></authentication>
       <membership>
            <providers>
              <clear/>
                <add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider, System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" connectionStringName="LocalSqlServer" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="true" applicationName="/" requiresUniqueEmail="false" passwordFormat="Hashed" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="7" minRequiredNonalphanumericCharacters="1" passwordAttemptWindow="10" passwordStrengthRegularExpression=""/>
            </providers>
        </membership>
      <compilation debug="true" targetFramework="4.5.2" />
      <httpRuntime targetFramework="4.5.2" />
    </system.web>

</configuration>

在某个地方我觉得我的连接字符串有误,下面我也分享我的 machine.config 连接字符串格式代码

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