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string nameStr = txtDCode.Text;
ObjectDataSource1.FilterExpression = " D_Code ='" + nameStr + " '";
ReportDataSource rds = new ReportDataSource("DeviceDataSet_DM_T_Device", ObjectDataSource1);
ReportViewer1.LocalReport.DataSources[0] = rds;
ReportViewer1.LocalReport.Refresh();
ParameterValues paramvalues = new ParameterValues();
ParameterDiscreteValue paradisvalues = new ParameterDiscreteValue();
paradisvalues.Value = "这里是传递参数的值";
paramvalues.Add(paradisvalues);
CrystalReportSource1.ReportDocument.DataDefinition.ParameterFields[0].ApplyCurrentValues(paramvalues);