EPPlus error reading file

Question

using code like

using OfficeOpenXml;  // namespace for the ExcelPackage assembly
…
FileInfo newFile = new FileInfo(@"C:\mynewfile.xlsx"); 
using (ExcelPackage xlPackage = new ExcelPackage(newFile)) { … }

I get an exception error of

'IBM437' is not a supported encoding name. For information on defining a custom encoding, see the documentation for the Encoding.RegisterProvider method. Parameter name: name

Any ideas as to what the problem could be?

Thanks Martin

Answer 1

The problem is in the ZIP file reader (ZipInputStream). You need to add the encodings like windows-1252 manually:

1. dotnet add package System.Text.Encoding.CodePages

2. Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);

More info here: .NET Core doesn't know about Windows 1252, how to fix?

Answer 2

if your project is .net core edit your project file then add

<ItemGroup>
<PackageReference Include="System.Text.Encoding.CodePages" Version="4.3.0" />
</ItemGroup>

and in your startup.cs

add

System.Text.Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);