C# System.TypeInitializationException'；发生

我正在ASP.NET MVC 5 C#中制作应用程序。 尝试从web.config文件访问连接字符串元素时出现异常

中发生“System.TypeInitializationException”类型的异常 WebPortalClient.dll，但未在用户代码中处理

Web.Config：

<?xml version="1.0" encoding="utf-8"?>
<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=301880
  -->
<configuration>  
  <configSections>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
    <sectionGroup name="applicationSettings" type="System.Configuration.ApplicationSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
      <section name="WebPortalClient.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
    </sectionGroup>
  </configSections>
  <connectionStrings>
    <!--<add name="DefaultConnection" connectionString="Data Source=.\SQLEXPRESS;Initial Catalog=aspnet-WebPortalClient-20140714023603;Integrated Security=True"
      providerName="System.Data.SqlClient" />-->
    <add name="WebPortalClient.Properties.Settings.ConnectionString"
      connectionString="Data Source=192.168.1.141;Initial Catalog=Dishkau;User ID=saud;Password=rakeord1"
      providerName="System.Data.SqlClient" />
  </connectionStrings>
  <appSettings>
    <add key="webpages:Version" value="3.0.0.0" />
    <add key="webpages:Enabled" value="false" />
    <add key="ClientValidationEnabled" value="true" />
    <add key="UnobtrusiveJavaScriptEnabled" value="true" />
  </appSettings>
  <system.web>
    <authentication mode="None" />
    <compilation debug="true" targetFramework="4.5" />
    <httpRuntime targetFramework="4.5" maxRequestLength="1048576" />
    <sessionState mode="InProc" timeout="99999" />
  </system.web>

  <system.webServer>
    <validation validateIntegratedModeConfiguration="false" />
    <security>
        <requestFiltering>
           <!-- Set the maximum request size to 1GB (the value is in Bytes here) -->
            <requestLimits maxAllowedContentLength="1073741824" />
        </requestFiltering>
    </security>
    <modules>
      <remove name="FormsAuthentication" />

    </modules>

  <!--<modules>
      <add name="SingleSessionEnforcement" type="SingleSessionEnforcement" />
    </modules>-->
  </system.webServer>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-5.0.0.0" newVersion="5.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="0.0.0.0-1.5.2.14234" newVersion="1.5.2.14234" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
    </providers>
  </entityFramework>
<system.web.extensions>
        <scripting>
            <webServices>
                <jsonSerialization maxJsonLength="1000000">
                </jsonSerialization>
            </webServices>
        </scripting>
    </system.web.extensions>
  <applicationSettings>
    <WebPortalClient.Properties.Settings>
      <setting name="UploadServiceUrl" serializeAs="String">
        <value>192.168.1.141:8085/lupload/</value>
      </setting>
      <setting name="LicenseName" serializeAs="String">
        <value>ARL</value>
      </setting>
    </WebPortalClient.Properties.Settings>
  </applicationSettings>
</configuration>

我找到了一个解决方案：

此异常表示以下行失败（检查代码中的装配行）：

确保这里没有异常发生

每当抛出TypeInitializationException时，请在抛出异常的语句中检查您第一次引用的类型的所有初始化逻辑

如果它不工作，您可以使用该异常的
.InnerException.Message
是什么？没有这些，我们只能在黑暗中拍摄。尽管公平地说，静态构造函数和/或静态字段初始值设定项在有问题的类型上的可见性也是一个很好的帮助{“建立到SQL Server的连接时发生与网络相关或特定于实例的错误。找不到或无法访问该服务器。请验证实例名称是否正确，以及SQL Server是否配置为允许远程连接。（提供程序：命名管道提供程序，错误：40-无法打开到SQL Server的连接）。”好了；然后…检查SQL server是否可用；联机，通过防火墙规则可用，等等…SQL server正在运行。我有一个web服务从db获取数据。它工作正常。此语句不会引发异常。内部异常：{”建立到SQL Server的连接时发生与网络相关或特定于实例的错误。找不到或无法访问该服务器。请验证实例名称是否正确，以及SQL Server是否配置为允许远程连接。（提供程序：命名管道提供程序，错误：40-无法打开到SQL Server的连接）“}你检查过这是正确的连接字符串吗？我编辑了答案并附加了一个链接到一篇文章，可以帮助你。谢谢亲爱的。我刚刚重新启动了电脑并自动修复了它。这个链接证明对我理解和解决问题很有帮助。
public static string ConString = 
    ConfigurationManager.ConnectionStrings["ConString"].ConnectionString;