XtraReport mReport = new XtraReport();

mReport.LoadLayout(Application.StartupPath @"\Reports\" @"rptSO.repx"); //报表模板文件 

//取报表数据

DataSet ds = new bllSO().GetReportData(txtNoFrom.Text, txtNoTo.Text, txtDateFrom.DateTime, txtDateTo.DateTime);

//查找组件

GroupHeaderBand GroupHeader1 = mReport.FindControl("GroupHeader1", true) as GroupHeaderBand;

DetailReportBand DetailReport = mReport.FindControl("DetailReport", true) as DetailReportBand;

DetailBand Detail1 = mReport.FindControl("Detail1", true) as DetailBand;

XRLabel xrLabel15 = mReport.FindControl("XRLabel15", true) as XRLabel;

XRLabel xrLabel23 = mReport.FindControl("XRLabel23", true) as XRLabel;

//重要！！！给组(GroupHeader)绑定主键字段

//本报表是按业务单号分组

GroupField gf = new GroupField("SONO", XRColumnSortOrder.Ascending);

GroupHeader1.GroupFields.Add(gf);

//给数据集建立主外键关系

DataColumn parentColumn = ds.Tables["tb_SO"].Columns["SONO"];

DataColumn childColumn = ds.Tables["tb_SOs"].Columns["SONO"];

DataRelation R1 = new DataRelation("R1", parentColumn, childColumn);

ds.Relations.Add(R1);

//绑定主表的数据源

mReport.DataMember = "tb_SO";

mReport.DataSource = ds;

//绑定明细表的数据源

DetailReport.DataMember = "R1";

DetailReport.DataSource = ds;

//自动绑定明细表XRLabel的数据源

BindingFields(ds, Detail1.Controls);

xrLabel15.DataBindings.Add("Text", ds, "R1.Amount");//绑定小计(当前单据的总金额)

xrLabel23.DataBindings.Add("Text", ds, "R1.Amount");//绑定总计(所有单据的总金额)