此方法顯式使用的 CAS 原則已被 .NET Framework 棄用。若要出於相容性原因而啟用 CAS 原則，請使用 NetFx40_LegacySecurityPolicy 配置開關

9 down vote

Just add this <NetFx40_LegacySecurityPolicy enabled="true"/> into your VS2010 DevEnv configuration file, you'll find it in C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\devenv.exe.config There is a <runtime> section, just copy it at the first place. I've had the same problem with DevExpress 8.2 If some people face the same problem while developing ASP.Net apps, they should add the Attribute to the Cassini config file placed in C:\Program Files (x86)\Common Files\microsoft shared\DevServer\10.0\WebDev.WebServer40.exe.config

<runtime>
  <NetFx40_LegacySecurityPolicy enabled="true"/>
</runtime>
在

 C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\devenv.exe.config

設定

修改前請備份

參考：

http://stackoverflow.com/questions/2637089/netfx40-legacysecuritypolicy-in-design-time-mode

<runtime>
  <NetFx40_LegacySecurityPolicy enabled="true"/>
</runtime>
在

 C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\devenv.exe.config

設定

修改前請備份

參考：

http://stackoverflow.com/questions/2637089/netfx40-legacysecuritypolicy-in-design-time-mode