问题
I'm the below error while running my code to get data from Oracle DB.
[A]Oracle.ManagedDataAccess.Client.OracleParameter cannot be cast to [B]Oracle.ManagedDataAccess.Client.OracleParameter. Type A originates from 'Oracle.ManagedDataAccess, Version=4.122.18.3, Culture=neutral, PublicKeyToken=89b483f429c47342' in the context 'LoadFrom' at location 'd:\Users\mukadfar\AppData\Local\Temp\Temporary ASP.NET Files\vs\02d43168\78988466\assembly\dl3\95159e45\00d2c436_a83bd401\Oracle.ManagedDataAccess.dll'. Type B originates from 'Oracle.ManagedDataAccess, Version=4.122.1.0, Culture=neutral, PublicKeyToken=89b483f429c47342' in the context 'Default' at location 'd:\Users\mukadfar\AppData\Local\Temp\Temporary ASP.NET Files\vs\02d43168\78988466\assembly\dl3\0b972c52\00ac59cd_7dd5d201\Oracle.ManagedDataAccess.dll'.
Here is my code for the same:
var param1 = "K60";
var param2 = "2018.09.14";
var param3 = "2018.09.14";
var param4 = string.Empty;
var param5 = string.Empty;
var param6 = string.Empty;
var param7 = string.Empty;
var param8 = string.Empty;
var param9 = string.Empty;
var param10 = string.Empty;
var param11 = string.Empty;
var param12 = string.Empty;
var param13 = string.Empty;
var param14 = string.Empty;
var param15 = string.Empty;
var param16 = string.Empty;
var param17 = string.Empty;
var param18 = string.Empty;
var parameters = new[]
{
new OracleParameter("wr_proccode_PM_cmb_C179", OracleDbType.Varchar2, 100, param1 != null ? (object)param1 : DBNull.Value, ParameterDirection.Input),
new OracleParameter("wr_start_day_C179", OracleDbType.Varchar2, 100, param2 != null ? (object)param2 : DBNull.Value, ParameterDirection.Input),
new OracleParameter("wr_end_day_C179", OracleDbType.Varchar2, 100, param1 != null ? (object)param3 : DBNull.Value, ParameterDirection.Input),
new OracleParameter("wr_operating_efficiency_total", OracleDbType.Decimal, 4000, param4 != null ? (object)param4 : DBNull.Value, ParameterDirection.InputOutput),
new OracleParameter("wr_time_efficiency", OracleDbType.Decimal, 4000, param5 != null ? (object)param5 : DBNull.Value, ParameterDirection.InputOutput),
new OracleParameter("wr_tons_efficiency_total", OracleDbType.Decimal, 4000, param6 != null ? (object)param6 : DBNull.Value, ParameterDirection.InputOutput),
new OracleParameter("wr_pope_gross", OracleDbType.Decimal, 4000, param7 != null ? (object)param7 : DBNull.Value, ParameterDirection.InputOutput),
new OracleParameter("wr_packed_net_prod", OracleDbType.Decimal, 4000, param8 != null ? (object)param8 : DBNull.Value, ParameterDirection.InputOutput),
new OracleParameter("wr_bottom_waste", OracleDbType.Decimal, 4000, param9 != null ? (object)param9 : DBNull.Value, ParameterDirection.InputOutput),
new OracleParameter("wr_avg_gm2", OracleDbType.Decimal, 4000, param10 != null ? (object)param10 : DBNull.Value, ParameterDirection.InputOutput),
new OracleParameter("wr_unplanned_shutdown_pcs", OracleDbType.Int32, 4000, param11 != null ? (object)param11 : DBNull.Value, ParameterDirection.InputOutput),
new OracleParameter("wr_grade_change_pcs", OracleDbType.Int32, 4000, param12 != null ? (object)param12 : DBNull.Value, ParameterDirection.InputOutput),
new OracleParameter("wr_break_pcs", OracleDbType.Int32, 4000, param13 != null ? (object)param13 : DBNull.Value, ParameterDirection.InputOutput),
new OracleParameter("wr_break_hr", OracleDbType.Varchar2, 4000, param14 != null ? (object)param14 : DBNull.Value, ParameterDirection.InputOutput),
new OracleParameter("wr_unplanned_shutdown_hr", OracleDbType.Varchar2, 4000, param15 != null ? (object)param15 : DBNull.Value, ParameterDirection.InputOutput),
new OracleParameter("wr_packed_net_prod_pcs", OracleDbType.Int32, 4000, param16 != null ? (object)param16 : DBNull.Value, ParameterDirection.InputOutput),
new OracleParameter("wr_rewinder_net_prod_pcs", OracleDbType.Decimal, 4000, param17 != null ? (object)param17 : DBNull.Value, ParameterDirection.InputOutput),
new OracleParameter("wr_warehouse_post_waste", OracleDbType.Decimal, 4000, param18 != null ? (object)param18 : DBNull.Value, ParameterDirection.InputOutput)
};
var procedure = $"Begin TP_BALELINE.getNextPlannedObjects(:wr_proccode_PM_cmb_C179, :wr_start_day_C179, :wr_end_day_C179, :wr_operating_efficiency_total, :wr_time_efficiency, :wr_tons_efficiency_total, :wr_pope_gross, :wr_packed_net_prod, :wr_bottom_waste, :wr_avg_gm2, :wr_unplanned_shutdown_pcs, :wr_grade_change_pcs, :wr_break_pcs, :wr_break_hr, :wr_unplanned_shutdown_hr, :wr_packed_net_prod_pcs, :wr_rewinder_net_prod_pcs, :wr_warehouse_post_waste); END;";
this.databaseContext.ExecuteSqlCommand(
procedure,
parameters[0],
parameters[1],
parameters[2],
parameters[3],
parameters[4],
parameters[5],
parameters[6],
parameters[7],
parameters[8],
parameters[9],
parameters[10],
parameters[11],
parameters[12],
Getting the error on the line ExecuteSqlCommand.
回答1:
All the details you need is in the error message, here's a shortened and emphasized version:
[A]Oracle.ManagedDataAccess.Client.OracleParameter cannot be cast to [B]Oracle.ManagedDataAccess.Client.OracleParameter. Type A originates from 'Oracle.ManagedDataAccess, Version=4.122.18.3, (snip some text) Type B originates from 'Oracle.ManagedDataAccess, Version=4.122.1.0, Culture=neutral, (snip)
So the problem here is that you have two distinct copies and versions of Oracle.ManagedDataAccess, and you're mixing types between them.
The fully qualified name of a type isn't just textual, it also contains the full version and signature of the assembly that contained it, so even though the two types might be 100% identical source-code wise, and even compiled-wise, the fact that they come from two different versions of the assembly makes them incompatible.
What you have to do is figure out where the two assemblies are referenced, figure out which one you want to use, and correct the other reference(s) so that they all refer to the same version of the assembly.
That should make the error go away.
来源：https://stackoverflow.com/questions/52379587/aoracle-manageddataaccess-client-oracleparameter-cannot-be-cast-to-boracle-m