Dapper For MySQL Query (chaîne sql) sql a une variable personnalisée (@rowNum) contient un caractère spécial @

Voici ma question. Je veux obtenir une liste de pages utilisateur et je ne veux pas utiliser limit.je peux alors utiliser sql comme ceci:

SELECT * FROM (SELECT @rowNum:=@rowNum+1 AS rowNum,User FROM (SELECT
@rowNum:=0) r,User where User.Name=@Name ORDER BY User.Name) AS a
WHERE rowNum>=1  AND rowNum<=10

code .net comme ceci:

connection.Query<T>(sql, new{Name="name"}, transaction, true,commandTimeout);

et quand je lance le programme, il lance une exception:

message: "Object reference not set to an instance of an object.",
data: { },
innerException: null,
stackTrace: " at MySql.Data.MySqlClient.MySqlConnection.get_ServerThread() at MySql.Data.MySqlClient.MySqlConnection.Abort() at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior behavior) at Dapper.SqlMapper.ExecuteReaderWithFlagsFallback(IDbCommand cmd, Boolean wasClosed, CommandBehavior behavior) at Dapper.SqlMapper.<QueryImpl>d__124`1.MoveNext() at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source) at Dapper.SqlMapper.Query[T](IDbConnection cnn, String sql, Object param, IDbTransaction transaction, Boolean buffered, Nullable`1 commandTimeout, Nullable`1 commandType) at Infrastructure.Dapper.MysqlMapperExtension.QueryPaged[T](IDbConnection connection, Object condition, String table, String orderBy, Int32 pageIndex, Int32 pageSize, String columns, Boolean isOr, IDbTransaction transaction, Nullable`1 commandTimeout) in E:\Lofter\Code Source\NetCore\MermaidLoft.Alchemy\MermaidLoft.Alchemy\src\Extensions\Infrastructure.Dapper\MysqlMapperExtension.cs:line 312 at MermaidLoft.Alchemy.BaseDomain.UserDomain.UserQueryService.FindUsersForPage(String userName, Int32 pageIndex, Int32 pageSize) in E:\Lofter\Code Source\NetCore\MermaidLoft.Alchemy\MermaidLoft.Alchemy\src\Domains\MermaidLoft.Alchemy.BaseDomain\UserDomain\UserQueryService.cs:line 30 at MermaidLoft.Alchemy.QuickWeb.Controllers.HomeController.Mysql() in E:\Lofter\Code Source\NetCore\MermaidLoft.Alchemy\MermaidLoft.Alchemy\src\MermaidLoft.Alchemy.QuickWeb\Controllers\HomeController.cs:line 40",
helpLink: null,
source: "SapientGuardian.MySql.Data",
hResult: -2147467261

Y a-t-il une idée pour résoudre ce problème? J'espère que certains peuvent m'aider, Thx!