VS 2022 ReportViewer Error: "The report cannot be displayed. The report viewer could not find a report definition."

Question

Please help me with this problem I'm having. I'll start by explaining my problem: I need to load reports, and for that I'm using the native reports of VS 2022. Here's what I've done so far:

1. I created my .xsd file called DataSetInformes.xsd
2. I added my RDLC file
3. I added a Form called Informes within the CapaPresentacion 3.1 I added another form called Ventas within the Informes folder
4. I added my RDLC report, called TicketUltimaVenta
5. I added a ReportViewer called ReportViewer1 to the form
6. I added the dataset to the RDLC
7. I linked it to the RDLC from the ReportViewer options.

When I selected the RDLC, dataSetInformes, grupoBindingSource, and grupoTableAdapter were added to the footer of the form, and this code was added to the form's load event:

// TODO: esta línea de código carga datos en la tabla 'dataSetInformes.Grupo' Puede moverla o quitarla según sea necesario.
this.grupoTableAdapter.Fill(this.dataSetInformes.Grupo);

What's happening is that sometimes it works and sometimes it doesn't. It tells me that I don't have a Dataset assigned, or that the .RDLC file doesn't exist in the Debug folder. (I enabled the "always copy" option for the RDLC.) But I want to do it programmatically to stop giving me errors, so I made this code:

DataSetInformes dataSet = new DataSetInformes();
this.reportViewer1.LocalReport.ReportPath = "TicketUltimaVenta.rdlc";
ReportDataSource reportDataSource = new ReportDataSource("DataSetInformes", dataSet.Tables["Grupo"]);
this.reportViewer1.LocalReport.DataSources.Clear();
this.reportViewer1.LocalReport.DataSources.Add(reportDataSource);
this.reportViewer1.RefreshReport();

This code doesn't work either. Please help me solve this problem, as I don't know where the error is. I will show you some screenshots of the project.

I appreciate your help in identifying my error.

Roberto

Answer 1

Hi @Roberto Carlos Melgar Dorado , Welcome to Microsoft Q&A,

You can try using the following code to load the dataset and associate it to the report:

using System;
using System.Windows.Forms;
using Microsoft.Reporting.WinForms;

namespaceCapaPresentacion
{
     public partial class Informes : Form
     {
         publicInformes()
         {
             InitializeComponent();
         }

         private void Informes_Load(object sender, EventArgs e)
         {
             //Create dataset object
             DataSetInformes dataSet = new DataSetInformes();

             try
             {
                 // populate the data set
                 this.grupoTableAdapter.Fill(dataSet.Grupo);

                 //Set report path
                 this.reportViewer1.LocalReport.ReportPath = "TicketUltimaVenta.rdlc";

                 //Create report data source
                 ReportDataSource reportDataSource = new ReportDataSource("DataSetInformes", dataSet.Tables["Grupo"]);

                 // Clear and add report data source
                 this.reportViewer1.LocalReport.DataSources.Clear();
                 this.reportViewer1.LocalReport.DataSources.Add(reportDataSource);

                 // refresh report
                 this.reportViewer1.RefreshReport();
             }
             catch (Exception ex)
             {
                 MessageBox.Show("Error loading report: " + ex.Message);
             }
         }
     }
}

Make sure to add this code to the Load event of the Informes form and associate it with the ReportViewer control.

Make sure to replace "DataSetInformes" and "Grupo" in your code with the actual names of your datasets and data tables.

Best Regards,

Jiale

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Answer 2

Dear Jiale,

Thank you so much for your help with my report loading issue. Your code worked perfectly, and I was able to successfully load the dataset and associate it with the report.

I really appreciate your time and assistance.

Best regards, Roberto Carlos Melgar Dorado