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与往常一样，我ReportViewer第一次使用它so long来渲染。
这里的任何人都可以告诉我可能是什么？
这是显示我如何喂养我的代码reportviewer 

    ReportParameter param = new ReportParameter("USR", usr);
    ReportViewer1.LocalReport.SetParameters(param);
    ReportViewer1.LocalReport.ReportPath = "MyReport.rdlc";
    DataSet ds = _rel.FeedDS(rel);
    ReportDataSource rds = new ReportDataSource("my_ds", ds.Tables[0]);
    ReportViewer1.LocalReport.DataSources.Clear();
    ReportViewer1.LocalReport.DataSources.Add(rds);
    ReportViewer1.DataBind();
    ReportViewer1.LocalReport.Refresh();
    paineel.Visible = true;
    ReportViewer1.Width = 640;  



    public DataSet FeedDS(Reports rel)
      {
         rel.Dt_Inicial += " 00:00:00";
         rel.Dt_Final += " 23:59:59";
         DataSet retorno = new DataSet();
         string sql = @"SELECT proj.descricao AS projeto, func.descricao AS funcionalidade, clb.clube AS cliente, ch.descricao
          FROM mytable ch 
          INNER JOIN projetos proj ON ch.projeto = proj.id 
          INNER JOIN funcionalidades func ON ch.funcionalidade = func.id 
          INNER JOIN clubes clb ON ch.clube = clb.id
          WHERE ch.dt_cadastro BETWEEN @dt_inicial AND @dt_final";
          MySqlCommand cmd = new MySqlCommand();
          cmd.CommandType = CommandType.Text;           
             try
                {
                    cmd.CommandText = sql;
                    cmd.Parameters.Add(new MySqlParameter("@dt_inicial", MySqlDbType.DateTime)).Value = rel.Dt_Inicial;
                    cmd.Parameters.Add(new MySqlParameter("@dt_final", MySqlDbType.DateTime)).Value = rel.Dt_Final;


                    retorno = _dal.Consultar(cmd);
                 }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
            return retorno;
        }

Obs：在我提供方法之前dataset，在FeedDS方法内部，我有 7 个IFs/Elses条件，我不知道这是否可能是问题......

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