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{System.InvalidOperationException: There is already an open DataReader associated with this Command which must be closed first.

at System.Data.SqlClient.SqlInternalConnectionTds.ValidateConnectionForExecute(SqlCommand command)

at System.Data.SqlClient.SqlConnection.ValidateConnectionForExecute(String method, SqlCommand command)

at System.Data.SqlClient.SqlCommand.ValidateCommand(Boolean async, String method)

at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite, String method)

at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior)

at Tkx.DbBase.SqlDbHelper.ExecuteReader(String sql, CommandType commandType, 

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原文：https://www.cnblogs.com/deepalley/p/12902477.html