EFCore 调用MySql 存储过程失败

EntityFrameworkCore 使用Pomelo.EntityFrameworkCore.MySql 调用具有返回参数的存储过程失败，错误提示 Only ParameterDirection.Input is supported when CommandType is Text (parameter name: @MemberID)
存储过程：

CREATE PROCEDURE `GetMemberID`(
   IN uname     VARCHAR(128),
   OUT MemberID     INT
)
BEGIN  
   SELECT ID INTO MemberID FROM `Member` Where username = uname;    
END

调用方式

var usernameParam = new MySqlParameter
{ 
   ParameterName = $"@uname",
   DbType = DbType.String,
   Direction = ParameterDirection.Input,
   Value = "test"
 };
var memberIDParam = new MySqlParameter
{ 
   ParameterName = $"@MemberID",
   DbType = DbType.Int32,
   Direction = ParameterDirection.Output
 };

rContext.Database.ExecuteSqlRaw($"Call GetMemberID (@uname=@uname, @MemberID=@MemberID OUT)", usernameParam , memberIDParam);

通过扩展方法来解决此问题：

public static int CallStoredRoutine(this DatabaseFacade databaseFacade,string routineName, params DbParameter[] parameters)
{
    int rows;

    var cmd = databaseFacade.GetDbConnection().CreateCommand();
    cmd.CommandText = routineName;
    cmd.Parameters.AddRange(parameters);
    cmd.CommandType = CommandType.StoredProcedure;

    databaseFacade.OpenConnection();
    rows = cmd.ExecuteNonQuery();
    databaseFacade.CloseConnection();

    return rows;
}

引用：https://github.com/mysql-net/MySqlConnector/issues/231

EFCore 调用MySql 存储过程失败

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