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DataTable dataTable;
using (var connection = new OracleConnection("你的连接字符串"))
{
dataTable = new DataTable();
var command = new OracleCommand();
command.Connection = connection;
command.CommandType = CommandType.Text;
command.CommandText = "SELECT * FROM User";
var adapter = new OracleDataAdapter();
adapter.SelectCommand = command;
adapter.Fill(dataTable);
}