如：Assembly 'SPPD.Backend.DataAccess.Test, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' is marked with the AllowPartiallyTrustedCallersAttribute, and uses the level 2 security transparency model. Level 2 transparency causes all methods in AllowPartiallyTrustedCallers assemblies to become security transparent by default, which may be the cause of this exception. 这种提示。
解决方法：AssemblyInfo.cs里加句[assembly: System.Security.SecurityRules(System.Security.SecurityRuleSet.Level1)]