How do I resolve 'subreport not found' error when using ReportViewerCore.NETCore 15.1.17 with ASP.NET Core rdlc subreport?

Question

When I used it in my code it re-issues the pdf but returns the error in the position subreport.

Error:

The subreport 'attendance' could not be found at the specified location attendance. Please verify that the subreport has been published and that the name is correct.

My code:

public async Task<FileContentResult> Attendance(InputFilterDto input)
{
    var path = $"{this.host.WebRootPath}\\Reports\\attendanceForUser.rdlc";

    Stream reportDefinition = new FileStream(path, FileMode.Open, FileAccess.Read);

    LocalReport report = new LocalReport();
    var datasourses = await Datasourses(input);

    foreach (var item in datasourses.DataSources)
    {
        report.DataSources.Add(item);
    }

    report.LoadReportDefinition(reportDefinition);
    report.SubreportProcessing += (sender, e) =>
        {
            foreach (var item in datasourses.DataSources)
            {
                e.DataSources.Add(item);
            }
        };

    byte[] pdf = report.Render("PDF");
    var fileResult = new FileContentResult(pdf, "application/pdf")
        {
            FileDownloadName = DateTime.Now.ToString("yy-MM-dd-hh-mm")
        };

    return fileResult;
}

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I asked gpt chat but it didn't help me to solve the problem

Answer 1

use this code:

var path = $"{this.host.WebRootPath}\\Reports\\attendanceForUser.rdlc";
            var subReportpath = $"{this.host.WebRootPath}\\Reports\\attendance.rdlc";
            using (Stream reportDefinition = new FileStream(path, FileMode.Open, FileAccess.Read))
            {
                LocalReport report = new LocalReport();
                var datasourses = await Datasourses(input);
                report.LoadReportDefinition(reportDefinition);
                using (Stream subReportDefinition = new FileStream(subReportpath, FileMode.Open, FileAccess.Read))
                {
                    report.LoadSubreportDefinition("attendance", subReportDefinition);
                }
                foreach (var item in datasourses.DataSources)
                {
                    report.DataSources.Add(item);
                }
                //report.SetParameters(parameters);
                report.SubreportProcessing += (sender, e) =>
                {
                    foreach (var item in datasourses.DataSources)
                    {
                        e.DataSources.Add(item);
                    }
                };
                byte[] pdf = report.Render("PDF");
                var fileResult = new FileContentResult(pdf, "application/pdf")
                {
                    FileDownloadName = DateTime.Now.ToString("yy-MM-dd-hh-mm")
                };
                return fileResult;
            }

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