RDLC reports on .NET Core 8

Question

Hi at all,

I'm using a rdlc report inside a .net core 8 app but i'm getting this error

{"An error occurred during local report processing.;The definition of the report 'report path inside the project' is invalid.\r\nAn unexpected error occurred in Report Processing.\r\nCompiler executable file C:\WINDOWS\Microsoft.NET\Framework64\v8.0.2\vbc.exe cannot be found."}

It only work if i copy the vbc.exe from another .net framework version, but if i deployed the app in azure i can't do this. It's possible to solve this problem without the copy of vbc.exe(Visual Basic Command Line Compiler)?

Thanks

Answer 1

This error happens because RDLC reports rely on Visual Basic for expressions, and .NET 8 does not include vbc.exe by default. Here's how to fix it without manually copying files:

Solution 1: Install .NET SDK with Visual Basic Support

1. Open Visual Studio Installer.
2. Modify your .NET 8 installation.
3. Under Individual Components, search for .NET Framework 4.x targeting pack and .NET Framework SDK.
4. Install them and restart your development environment.

Solution 2: Use Microsoft.ReportingServices.ReportViewer

• Switch to the ReportViewer control for RDLC processing.
• Install the Microsoft.ReportingServices.ReportViewer.NetCore NuGet package.
• This uses managed code and doesn't rely on vbc.exe.

Solution 3: Use .NET 6/7

• RDLC reports work more smoothly in .NET 6 or 7 because of better backward compatibility with .NET Framework dependencies.
• Consider downgrading to .NET 7 if possible.

Azure Deployment

For Azure:

• Use App Service with .NET Framework runtime for compatibility.
• Alternatively, containerize the app with all dependencies pre-installed.

Let me know if you need help implementing any of these steps! This error happens because RDLC reports rely on Visual Basic for expressions, and .NET 8 does not include vbc.exe by default. Here's how to fix it without manually copying files:

Solution 1: Install .NET SDK with Visual Basic Support

1. Open Visual Studio Installer.
2. Modify your .NET 8 installation.
3. Under Individual Components, search for .NET Framework 4.x targeting pack and .NET Framework SDK.
4. Install them and restart your development environment.

Solution 2: Use Microsoft.ReportingServices.ReportViewer

• Switch to the ReportViewer control for RDLC processing.
• Install the Microsoft.ReportingServices.ReportViewer.NetCore NuGet package.
• This uses managed code and doesn't rely on vbc.exe.

Solution 3: Use .NET 6/7

• RDLC reports work more smoothly in .NET 6 or 7 because of better backward compatibility with .NET Framework dependencies.
• Consider downgrading to .NET 7 if possible.

Azure Deployment

For Azure:

• Use App Service with .NET Framework runtime for compatibility.
• Alternatively, containerize the app with all dependencies pre-installed.

Let me know if you need help implementing any of these steps!