每个配置文件只允许一个 configSections 元素，并且 if 必须是根配置元素的第一个子元素

我正在开发这个控制台应用，当我运行.exe 文件时，我得到以下错误:

system.Configuration.ConfigurationErrorsException: 每个配置文件只允许一个 <configSections>元素，如果存在，则必须是根 <configuration>元素的第一个子元素。

这是我的 App.config文件:

<configuration>
<startup useLegacyV2RuntimeActivationPolicy="true">
<supportedRuntime version="v4.0"/>
</startup>
<configSections>
<section name="Reva.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
</configSections>
<!-- ... -->

但是，如果我删除以下 startup部分，那么它的工作正常吗

<startup useLegacyV2RuntimeActivationPolicy="true">
<supportedRuntime version="v4.0"/>
</startup>

59487

小开

最佳答案

The error message itself actually details the correct fix:

configSections must be the first child* of the root element:

^{*emphasis added}

So just move the configSections to the top:

<configuration>
<configSections>
<section name="Reva.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
</configSections>
<startup useLegacyV2RuntimeActivationPolicy="true">
<supportedRuntime version="v4.0"/>
</startup>
</configuration>

<?xml version="1.0" encoding="utf-8"?> <configuration> <connectionStrings> <add name="SQLConnect" connectionString="Data Source=SAHIL; Initial Catalog=Demo; Integrated Security=SSPI" providerName="System.Data.SqlClient" /> </connectionStrings> <configSections> <sectionnamesectionname="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" /> </configSections> : : : : : : : </configuration>