报错信息如下：
Microsoft.Data.SqlClient.SqlException (0x80131904): A connection was successfully established with the server, but then an error occurred during the login process. (provider: SSL Provider, error: 0 - 证书链是由不受信任的颁发机构颁发的。)
---> System.ComponentModel.Win32Exception (0x80090325): 证书链是由不受信任的颁发机构颁发的。
at Microsoft.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
at Microsoft.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
at Microsoft.Data.SqlClient.TdsParserStateObject.ThrowExceptionAndWarning(Boolean callerHasConnectionLock, Boolean asyncClose)
at Microsoft.Data.SqlClient.TdsParserStateObject.SNIWritePacket(PacketHandle packet, UInt32& sniError, Boolean canAccumulate, Boolean callerHasConnectionLock)
at Microsoft.Data.SqlClient.TdsParserStateObject.WriteSni(Boolean canAccumulate)
at Microsoft.Data.SqlClient.TdsParserStateObject.WritePacket(Byte flushMode, Boolean canAccumulate)
at Microsoft.Data.SqlClient.TdsParser.TdsLogin(SqlLogin rec, FeatureExtension requestedFeatures, SessionData recoverySessionData, FederatedAuthenticationFeatureExtensionData fedAuthFeatureExtensionData)
at Microsoft.Data.SqlClient.SqlInternalConnectionTds.Login(ServerInfo server, TimeoutTimer timeout, String newPassword, SecureString newSecurePassword)
at Microsoft.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean ignoreSniOpenTimeout, TimeoutTimer timeout, Boolean withFailover)解决方案一：
连接字符串添加Encrypt=True;TrustServerCertificate=True;；完整内容如下：
Data Source=(local);Initial Catalog=TestDB;User ID=sa;Password=Aa123456;Persist Security Info=True;Encrypt=True;TrustServerCertificate=True;