ReportView1.LocalReport.DataSources.Clear();
ReportDataSource ds = new ReportDataSource("DXYQDataSet_Performance_devices", ObjectDataSource2);
ReportView1.LocalReport.DataSources.Add(ds);
ReportView1.LocalReport.Refresh();
RDLC报表引用ObjectDatasources实例数据源
原文：http://www.cnblogs.com/princesanji/p/3944701.html