FileNotFoundException using Windows Forms Report Viewer 150.1537.0

Question

I recently updated to Microsoft.ReportingServices.ReportViewerControl.Winforms version 150.1577.0, released 26/04, and it appears to be broken, failing at runtime with the error:

System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.ReportViewer.ProcessingObjectModel, Version=15.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91' or one of its dependencies. The system cannot find the file specified.

A bit of investigation by comparison to the preview version 150.1537.0 shows the nuspec file to be missing some files, which are downloaded as part of the package but missing from my build folder:

<?xml version="1.0" encoding="utf-8"?>
<package xmlns="http://schemas.microsoft.com/packaging/2013/05/nuspec.xsd">
  <metadata>
    <id>Microsoft.ReportingServices.ReportViewerControl.Winforms</id>
    <version>150.1577.0</version>
    ...removed for revity...
    <owners>Microsoft</owners>
    <requireLicenseAcceptance>true</requireLicenseAcceptance>
    <licenseUrl>https://go.microsoft.com/fwlink/?LinkId=826162</licenseUrl>
    <projectUrl>https://go.microsoft.com/fwlink/?linkid=2014377</projectUrl>
    <description>Microsoft Report Viewer Control for .Net Windows Forms applications. Contains the assemblies required to use the Windows Forms Report Viewer Control</description>
    <releaseNotes>See Reporting Services Blog: https://go.microsoft.com/fwlink/?linkid=2133837</releaseNotes>
    <copyright>© Microsoft Corporation. All rights reserved.</copyright>
    <tags>Microsoft SSRS ReportViewer Report Viewer ReportingServices PBIRS Rdl Rdlc Paginated Reporting DataViz MSFT visualization WinForms</tags>
    <dependencies>
      <dependency id="Microsoft.SqlServer.Types" version="14.0.0" />
    </dependencies>
    <references>
      <reference file="Microsoft.ReportViewer.Winforms.dll" />
      <reference file="Microsoft.ReportViewer.Common.dll" />
    </references>
  </metadata>
</package>

Answer 1

Hi @Andrew Polden

Can you find this assembly in the project's reference? If not, try C:\Windows\assembly\GAC_MSIL... Locate the assembly, place it in the project's reference, and then set its Copy Local to true.

For more details, you can see this link: https://stackoverflow.com/questions/45207154/could-not-load-file-or-assembly-microsoft-reportviewer-processingobjectmodel-v.

Best regards,

Aniya

Answer 2

I tried adding the missing files to the nuspec and they were copied to my output folder as I expected in the first place. I wouldn't necessarily recommend this approach and I have no way of knowing if it may cause other unexpected problems, but I think it seems pretty clear there is a problem with this release.