How to load SubReport in Syncfusion ASP.NET Core Report Viewer

Syncfusion ASP.NET Core ReportViewer allows you to render reports, which are embedded with one another using the subreport report item. The following steps help you to load the RDLC report with subreport item in a Report Viewer:

1. Create a simple ReportViewer application with the help of getting started documentation.

2. Right-click the project and go to the Add New Item dialog. In the dialog, select Report Wizard and name it as MainReport.rdlc for the report, and then click Add.

3. Repeat the step_2 to add the subreport and name it SubReport.rdlc.

4. Right-click the subreport, and then click Subreport Properties.

5. As per RDL standards, you can set the SubReport Path and properties like Microsoft ReportViewer as follows. In the Subreport Properties dialog box, type a name in the Name text box. The name must be unique within the report.

6. You can pass the data source values to the OnReportLoaded method of subreport as shown in the following example.

        public void OnInitReportOptions(ReportViewerOptions reportOption)
        {
            string basePath = _hostingEnvironment.WebRootPath;
 
            if (reportOption.SubReportModel != null)
            {
                FileStream SubStream = new FileStream(basePath + @"\ReportData\SubReport.rdlc", FileMode.Open, FileAccess.Read);
                reportOption.SubReportModel.Stream = SubStream;
            }
            else
            {
                FileStream inputStream = new FileStream(basePath + @"\ReportData\MainReport.rdlc", FileMode.Open, FileAccess.Read);
                reportOption.ReportModel.Stream = inputStream;
            }
        }
 
        public void OnReportLoaded(ReportViewerOptions reportOption)
        {
            if (reportOption.SubReportModel != null)
            {
                reportOption.SubReportModel.DataSources.Add(new ReportDataSource { Name = "StoreSales", Value = StoreSales.GetData() });
            }
            else
            {
                reportOption.ReportModel.DataSources.Add(new ReportDataSource { Name = "TopSalesPerson", Value = SalesPersons.GetTopSalesPerson() });
            }
        }

List of supported properties of subreport

The ReportViewer has the following subreport properties to set the DataSources, Parameters, and more through code behind.

Run the application

Run the sample application. You can see the RDLC subreport loaded in the ReportViewer as shown in the following screenshot.

Download the sample application with subreport from here.