[SqlException (0x80131904): Timeout 时间已到。在操作完成之前超时时间已过或服务器未响应。]
System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) +1058
System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +111
System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +125
System.Data.SqlClient.SqlConnection.Open() +157
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